1use crate::{
   2    db::{self, NewUserParams, UserId},
   3    rpc::{CLEANUP_TIMEOUT, RECONNECT_TIMEOUT},
   4    tests::{TestClient, TestServer},
   5};
   6use anyhow::{anyhow, Result};
   7use call::ActiveCall;
   8use client::RECEIVE_TIMEOUT;
   9use collections::{BTreeMap, HashSet};
  10use editor::Bias;
  11use fs::{FakeFs, Fs as _};
  12use futures::StreamExt as _;
  13use gpui::{executor::Deterministic, ModelHandle, Task, TestAppContext};
  14use language::{range_to_lsp, FakeLspAdapter, Language, LanguageConfig, PointUtf16};
  15use lsp::FakeLanguageServer;
  16use parking_lot::Mutex;
  17use project::{search::SearchQuery, Project, ProjectPath};
  18use rand::{
  19    distributions::{Alphanumeric, DistString},
  20    prelude::*,
  21};
  22use serde::{Deserialize, Serialize};
  23use std::{
  24    env,
  25    ops::Range,
  26    path::{Path, PathBuf},
  27    rc::Rc,
  28    sync::{
  29        atomic::{AtomicBool, Ordering::SeqCst},
  30        Arc,
  31    },
  32};
  33use util::ResultExt;
  34
  35#[gpui::test(iterations = 100)]
  36async fn test_random_collaboration(
  37    cx: &mut TestAppContext,
  38    deterministic: Arc<Deterministic>,
  39    rng: StdRng,
  40) {
  41    deterministic.forbid_parking();
  42
  43    let max_peers = env::var("MAX_PEERS")
  44        .map(|i| i.parse().expect("invalid `MAX_PEERS` variable"))
  45        .unwrap_or(3);
  46    let max_operations = env::var("OPERATIONS")
  47        .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
  48        .unwrap_or(10);
  49
  50    let plan_load_path = path_env_var("LOAD_PLAN");
  51    let plan_save_path = path_env_var("SAVE_PLAN");
  52
  53    let mut server = TestServer::start(&deterministic).await;
  54    let db = server.app_state.db.clone();
  55
  56    let mut users = Vec::new();
  57    for ix in 0..max_peers {
  58        let username = format!("user-{}", ix + 1);
  59        let user_id = db
  60            .create_user(
  61                &format!("{username}@example.com"),
  62                false,
  63                NewUserParams {
  64                    github_login: username.clone(),
  65                    github_user_id: (ix + 1) as i32,
  66                    invite_count: 0,
  67                },
  68            )
  69            .await
  70            .unwrap()
  71            .user_id;
  72        users.push(UserTestPlan {
  73            user_id,
  74            username,
  75            online: false,
  76            next_root_id: 0,
  77            operation_ix: 0,
  78        });
  79    }
  80
  81    for (ix, user_a) in users.iter().enumerate() {
  82        for user_b in &users[ix + 1..] {
  83            server
  84                .app_state
  85                .db
  86                .send_contact_request(user_a.user_id, user_b.user_id)
  87                .await
  88                .unwrap();
  89            server
  90                .app_state
  91                .db
  92                .respond_to_contact_request(user_b.user_id, user_a.user_id, true)
  93                .await
  94                .unwrap();
  95        }
  96    }
  97
  98    let plan = Arc::new(Mutex::new(TestPlan::new(rng, users, max_operations)));
  99
 100    if let Some(path) = &plan_load_path {
 101        eprintln!("loaded plan from path {:?}", path);
 102        plan.lock().load(path);
 103    }
 104
 105    let mut clients = Vec::new();
 106    let mut client_tasks = Vec::new();
 107    let mut operation_channels = Vec::new();
 108    let mut next_entity_id = 100000;
 109
 110    loop {
 111        let Some((next_operation, skipped)) = plan.lock().next_server_operation(&clients) else { break };
 112        let applied = apply_server_operation(
 113            deterministic.clone(),
 114            &mut server,
 115            &mut clients,
 116            &mut client_tasks,
 117            &mut operation_channels,
 118            &mut next_entity_id,
 119            plan.clone(),
 120            next_operation,
 121            cx,
 122        )
 123        .await;
 124        if !applied {
 125            skipped.store(false, SeqCst);
 126        }
 127    }
 128
 129    drop(operation_channels);
 130    deterministic.start_waiting();
 131    futures::future::join_all(client_tasks).await;
 132    deterministic.finish_waiting();
 133    deterministic.run_until_parked();
 134
 135    if let Some(path) = &plan_save_path {
 136        eprintln!("saved test plan to path {:?}", path);
 137        plan.lock().save(path);
 138    }
 139
 140    for (client, client_cx) in &clients {
 141        for guest_project in client.remote_projects().iter() {
 142            guest_project.read_with(client_cx, |guest_project, cx| {
 143                let host_project = clients.iter().find_map(|(client, cx)| {
 144                    let project = client
 145                        .local_projects()
 146                        .iter()
 147                        .find(|host_project| {
 148                            host_project.read_with(cx, |host_project, _| {
 149                                host_project.remote_id() == guest_project.remote_id()
 150                            })
 151                        })?
 152                        .clone();
 153                    Some((project, cx))
 154                });
 155
 156                if !guest_project.is_read_only() {
 157                    if let Some((host_project, host_cx)) = host_project {
 158                        let host_worktree_snapshots =
 159                            host_project.read_with(host_cx, |host_project, cx| {
 160                                host_project
 161                                    .worktrees(cx)
 162                                    .map(|worktree| {
 163                                        let worktree = worktree.read(cx);
 164                                        (worktree.id(), worktree.snapshot())
 165                                    })
 166                                    .collect::<BTreeMap<_, _>>()
 167                            });
 168                        let guest_worktree_snapshots = guest_project
 169                            .worktrees(cx)
 170                            .map(|worktree| {
 171                                let worktree = worktree.read(cx);
 172                                (worktree.id(), worktree.snapshot())
 173                            })
 174                            .collect::<BTreeMap<_, _>>();
 175
 176                        assert_eq!(
 177                            guest_worktree_snapshots.keys().collect::<Vec<_>>(),
 178                            host_worktree_snapshots.keys().collect::<Vec<_>>(),
 179                            "{} has different worktrees than the host",
 180                            client.username
 181                        );
 182
 183                        for (id, host_snapshot) in &host_worktree_snapshots {
 184                            let guest_snapshot = &guest_worktree_snapshots[id];
 185                            assert_eq!(
 186                                guest_snapshot.root_name(),
 187                                host_snapshot.root_name(),
 188                                "{} has different root name than the host for worktree {}",
 189                                client.username,
 190                                id
 191                            );
 192                            assert_eq!(
 193                                guest_snapshot.abs_path(),
 194                                host_snapshot.abs_path(),
 195                                "{} has different abs path than the host for worktree {}",
 196                                client.username,
 197                                id
 198                            );
 199                            assert_eq!(
 200                                guest_snapshot.entries(false).collect::<Vec<_>>(),
 201                                host_snapshot.entries(false).collect::<Vec<_>>(),
 202                                "{} has different snapshot than the host for worktree {} ({:?}) and project {:?}",
 203                                client.username,
 204                                id,
 205                                host_snapshot.abs_path(),
 206                                host_project.read_with(host_cx, |project, _| project.remote_id())
 207                            );
 208                            assert_eq!(guest_snapshot.scan_id(), host_snapshot.scan_id());
 209                        }
 210                    }
 211                }
 212
 213                guest_project.check_invariants(cx);
 214            });
 215        }
 216
 217        let buffers = client.buffers().clone();
 218        for (guest_project, guest_buffers) in &buffers {
 219            let project_id = if guest_project.read_with(client_cx, |project, _| {
 220                project.is_local() || project.is_read_only()
 221            }) {
 222                continue;
 223            } else {
 224                guest_project
 225                    .read_with(client_cx, |project, _| project.remote_id())
 226                    .unwrap()
 227            };
 228            let guest_user_id = client.user_id().unwrap();
 229
 230            let host_project = clients.iter().find_map(|(client, cx)| {
 231                let project = client
 232                    .local_projects()
 233                    .iter()
 234                    .find(|host_project| {
 235                        host_project.read_with(cx, |host_project, _| {
 236                            host_project.remote_id() == Some(project_id)
 237                        })
 238                    })?
 239                    .clone();
 240                Some((client.user_id().unwrap(), project, cx))
 241            });
 242
 243            let (host_user_id, host_project, host_cx) =
 244                if let Some((host_user_id, host_project, host_cx)) = host_project {
 245                    (host_user_id, host_project, host_cx)
 246                } else {
 247                    continue;
 248                };
 249
 250            for guest_buffer in guest_buffers {
 251                let buffer_id = guest_buffer.read_with(client_cx, |buffer, _| buffer.remote_id());
 252                let host_buffer = host_project.read_with(host_cx, |project, cx| {
 253                    project.buffer_for_id(buffer_id, cx).unwrap_or_else(|| {
 254                        panic!(
 255                            "host does not have buffer for guest:{}, peer:{:?}, id:{}",
 256                            client.username,
 257                            client.peer_id(),
 258                            buffer_id
 259                        )
 260                    })
 261                });
 262                let path = host_buffer
 263                    .read_with(host_cx, |buffer, cx| buffer.file().unwrap().full_path(cx));
 264
 265                assert_eq!(
 266                    guest_buffer.read_with(client_cx, |buffer, _| buffer.deferred_ops_len()),
 267                    0,
 268                    "{}, buffer {}, path {:?} has deferred operations",
 269                    client.username,
 270                    buffer_id,
 271                    path,
 272                );
 273                assert_eq!(
 274                    guest_buffer.read_with(client_cx, |buffer, _| buffer.text()),
 275                    host_buffer.read_with(host_cx, |buffer, _| buffer.text()),
 276                    "{}, buffer {}, path {:?}, differs from the host's buffer",
 277                    client.username,
 278                    buffer_id,
 279                    path
 280                );
 281
 282                let host_file = host_buffer.read_with(host_cx, |b, _| b.file().cloned());
 283                let guest_file = guest_buffer.read_with(client_cx, |b, _| b.file().cloned());
 284                match (host_file, guest_file) {
 285                    (Some(host_file), Some(guest_file)) => {
 286                        assert_eq!(guest_file.path(), host_file.path());
 287                        assert_eq!(guest_file.is_deleted(), host_file.is_deleted());
 288                        assert_eq!(
 289                            guest_file.mtime(),
 290                            host_file.mtime(),
 291                            "guest {} mtime does not match host {} for path {:?} in project {}",
 292                            guest_user_id,
 293                            host_user_id,
 294                            guest_file.path(),
 295                            project_id,
 296                        );
 297                    }
 298                    (None, None) => {}
 299                    (None, _) => panic!("host's file is None, guest's isn't"),
 300                    (_, None) => panic!("guest's file is None, hosts's isn't"),
 301                }
 302
 303                let host_diff_base =
 304                    host_buffer.read_with(host_cx, |b, _| b.diff_base().map(ToString::to_string));
 305                let guest_diff_base = guest_buffer
 306                    .read_with(client_cx, |b, _| b.diff_base().map(ToString::to_string));
 307                assert_eq!(guest_diff_base, host_diff_base);
 308            }
 309        }
 310    }
 311
 312    for (client, mut cx) in clients {
 313        cx.update(|cx| {
 314            cx.clear_globals();
 315            drop(client);
 316        });
 317    }
 318}
 319
 320async fn apply_server_operation(
 321    deterministic: Arc<Deterministic>,
 322    server: &mut TestServer,
 323    clients: &mut Vec<(Rc<TestClient>, TestAppContext)>,
 324    client_tasks: &mut Vec<Task<()>>,
 325    operation_channels: &mut Vec<futures::channel::mpsc::UnboundedSender<()>>,
 326    next_entity_id: &mut usize,
 327    plan: Arc<Mutex<TestPlan>>,
 328    operation: Operation,
 329    cx: &mut TestAppContext,
 330) -> bool {
 331    match operation {
 332        Operation::AddConnection { user_id } => {
 333            let username;
 334            {
 335                let mut plan = plan.lock();
 336                let mut user = plan.user(user_id);
 337                if user.online {
 338                    return false;
 339                }
 340                user.online = true;
 341                username = user.username.clone();
 342            };
 343            log::info!("Adding new connection for {}", username);
 344            *next_entity_id += 100000;
 345            let mut client_cx = TestAppContext::new(
 346                cx.foreground_platform(),
 347                cx.platform(),
 348                deterministic.build_foreground(*next_entity_id),
 349                deterministic.build_background(),
 350                cx.font_cache(),
 351                cx.leak_detector(),
 352                *next_entity_id,
 353                cx.function_name.clone(),
 354            );
 355
 356            let (operation_tx, operation_rx) = futures::channel::mpsc::unbounded();
 357            let client = Rc::new(server.create_client(&mut client_cx, &username).await);
 358            operation_channels.push(operation_tx);
 359            clients.push((client.clone(), client_cx.clone()));
 360            client_tasks.push(client_cx.foreground().spawn(simulate_client(
 361                client,
 362                operation_rx,
 363                plan.clone(),
 364                client_cx,
 365            )));
 366
 367            log::info!("Added connection for {}", username);
 368        }
 369
 370        Operation::RemoveConnection { user_id } => {
 371            log::info!("Simulating full disconnection of user {}", user_id);
 372            let client_ix = clients
 373                .iter()
 374                .position(|(client, cx)| client.current_user_id(cx) == user_id);
 375            let Some(client_ix) = client_ix else { return false };
 376            let user_connection_ids = server
 377                .connection_pool
 378                .lock()
 379                .user_connection_ids(user_id)
 380                .collect::<Vec<_>>();
 381            assert_eq!(user_connection_ids.len(), 1);
 382            let removed_peer_id = user_connection_ids[0].into();
 383            let (client, mut client_cx) = clients.remove(client_ix);
 384            let client_task = client_tasks.remove(client_ix);
 385            operation_channels.remove(client_ix);
 386            server.forbid_connections();
 387            server.disconnect_client(removed_peer_id);
 388            deterministic.advance_clock(RECEIVE_TIMEOUT + RECONNECT_TIMEOUT);
 389            deterministic.start_waiting();
 390            log::info!("Waiting for user {} to exit...", user_id);
 391            client_task.await;
 392            deterministic.finish_waiting();
 393            server.allow_connections();
 394
 395            for project in client.remote_projects().iter() {
 396                project.read_with(&client_cx, |project, _| {
 397                    assert!(
 398                        project.is_read_only(),
 399                        "project {:?} should be read only",
 400                        project.remote_id()
 401                    )
 402                });
 403            }
 404
 405            for (client, cx) in clients {
 406                let contacts = server
 407                    .app_state
 408                    .db
 409                    .get_contacts(client.current_user_id(cx))
 410                    .await
 411                    .unwrap();
 412                let pool = server.connection_pool.lock();
 413                for contact in contacts {
 414                    if let db::Contact::Accepted { user_id: id, .. } = contact {
 415                        if pool.is_user_online(id) {
 416                            assert_ne!(
 417                                id, user_id,
 418                                "removed client is still a contact of another peer"
 419                            );
 420                        }
 421                    }
 422                }
 423            }
 424
 425            log::info!("{} removed", client.username);
 426            plan.lock().user(user_id).online = false;
 427            client_cx.update(|cx| {
 428                cx.clear_globals();
 429                drop(client);
 430            });
 431        }
 432
 433        Operation::BounceConnection { user_id } => {
 434            log::info!("Simulating temporary disconnection of user {}", user_id);
 435            let user_connection_ids = server
 436                .connection_pool
 437                .lock()
 438                .user_connection_ids(user_id)
 439                .collect::<Vec<_>>();
 440            if user_connection_ids.is_empty() {
 441                return false;
 442            }
 443            assert_eq!(user_connection_ids.len(), 1);
 444            let peer_id = user_connection_ids[0].into();
 445            server.disconnect_client(peer_id);
 446            deterministic.advance_clock(RECEIVE_TIMEOUT + RECONNECT_TIMEOUT);
 447        }
 448
 449        Operation::RestartServer => {
 450            log::info!("Simulating server restart");
 451            server.reset().await;
 452            deterministic.advance_clock(RECEIVE_TIMEOUT);
 453            server.start().await.unwrap();
 454            deterministic.advance_clock(CLEANUP_TIMEOUT);
 455            let environment = &server.app_state.config.zed_environment;
 456            let stale_room_ids = server
 457                .app_state
 458                .db
 459                .stale_room_ids(environment, server.id())
 460                .await
 461                .unwrap();
 462            assert_eq!(stale_room_ids, vec![]);
 463        }
 464
 465        Operation::MutateClients { user_ids, quiesce } => {
 466            let mut applied = false;
 467            for user_id in user_ids {
 468                let client_ix = clients
 469                    .iter()
 470                    .position(|(client, cx)| client.current_user_id(cx) == user_id);
 471                let Some(client_ix) = client_ix else { continue };
 472                applied = true;
 473                if let Err(err) = operation_channels[client_ix].unbounded_send(()) {
 474                    // panic!("error signaling user {}, client {}", user_id, client_ix);
 475                }
 476            }
 477
 478            if quiesce && applied {
 479                deterministic.run_until_parked();
 480            }
 481
 482            return applied;
 483        }
 484    }
 485    true
 486}
 487
 488async fn apply_client_operation(
 489    client: &TestClient,
 490    operation: ClientOperation,
 491    cx: &mut TestAppContext,
 492) -> Result<bool> {
 493    match operation {
 494        ClientOperation::AcceptIncomingCall => {
 495            let active_call = cx.read(ActiveCall::global);
 496            if active_call.read_with(cx, |call, _| call.incoming().borrow().is_none()) {
 497                return Ok(false);
 498            }
 499
 500            log::info!("{}: accepting incoming call", client.username);
 501            active_call
 502                .update(cx, |call, cx| call.accept_incoming(cx))
 503                .await?;
 504        }
 505
 506        ClientOperation::RejectIncomingCall => {
 507            let active_call = cx.read(ActiveCall::global);
 508            if active_call.read_with(cx, |call, _| call.incoming().borrow().is_none()) {
 509                return Ok(false);
 510            }
 511
 512            log::info!("{}: declining incoming call", client.username);
 513            active_call.update(cx, |call, _| call.decline_incoming())?;
 514        }
 515
 516        ClientOperation::LeaveCall => {
 517            let active_call = cx.read(ActiveCall::global);
 518            if active_call.read_with(cx, |call, _| call.room().is_none()) {
 519                return Ok(false);
 520            }
 521
 522            log::info!("{}: hanging up", client.username);
 523            active_call.update(cx, |call, cx| call.hang_up(cx))?;
 524        }
 525
 526        ClientOperation::InviteContactToCall { user_id } => {
 527            let active_call = cx.read(ActiveCall::global);
 528
 529            log::info!("{}: inviting {}", client.username, user_id,);
 530            active_call
 531                .update(cx, |call, cx| call.invite(user_id.to_proto(), None, cx))
 532                .await
 533                .log_err();
 534        }
 535
 536        ClientOperation::OpenLocalProject { first_root_name } => {
 537            log::info!(
 538                "{}: opening local project at {:?}",
 539                client.username,
 540                first_root_name
 541            );
 542
 543            let root_path = Path::new("/").join(&first_root_name);
 544            client.fs.create_dir(&root_path).await.unwrap();
 545            client
 546                .fs
 547                .create_file(&root_path.join("main.rs"), Default::default())
 548                .await
 549                .unwrap();
 550            let project = client.build_local_project(root_path, cx).await.0;
 551            ensure_project_shared(&project, client, cx).await;
 552            client.local_projects_mut().push(project.clone());
 553        }
 554
 555        ClientOperation::AddWorktreeToProject {
 556            project_root_name,
 557            new_root_path,
 558        } => {
 559            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 560                return Ok(false)
 561            };
 562
 563            log::info!(
 564                "{}: finding/creating local worktree at {:?} to project with root path {}",
 565                client.username,
 566                new_root_path,
 567                project_root_name
 568            );
 569
 570            ensure_project_shared(&project, client, cx).await;
 571            if !client.fs.paths().await.contains(&new_root_path) {
 572                client.fs.create_dir(&new_root_path).await.unwrap();
 573            }
 574            project
 575                .update(cx, |project, cx| {
 576                    project.find_or_create_local_worktree(&new_root_path, true, cx)
 577                })
 578                .await
 579                .unwrap();
 580        }
 581
 582        ClientOperation::CloseRemoteProject { project_root_name } => {
 583            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 584                return Ok(false)
 585            };
 586
 587            log::info!(
 588                "{}: closing remote project with root path {}",
 589                client.username,
 590                project_root_name,
 591            );
 592
 593            let ix = client
 594                .remote_projects()
 595                .iter()
 596                .position(|p| p == &project)
 597                .unwrap();
 598            cx.update(|_| {
 599                client.remote_projects_mut().remove(ix);
 600                drop(project);
 601            });
 602        }
 603
 604        ClientOperation::OpenRemoteProject {
 605            host_id,
 606            first_root_name,
 607        } => {
 608            let active_call = cx.read(ActiveCall::global);
 609            let project = active_call.update(cx, |call, cx| {
 610                let room = call.room().cloned()?;
 611                let participant = room
 612                    .read(cx)
 613                    .remote_participants()
 614                    .get(&host_id.to_proto())?;
 615                let project_id = participant
 616                    .projects
 617                    .iter()
 618                    .find(|project| project.worktree_root_names[0] == first_root_name)?
 619                    .id;
 620                Some(room.update(cx, |room, cx| {
 621                    room.join_project(
 622                        project_id,
 623                        client.language_registry.clone(),
 624                        FakeFs::new(cx.background().clone()),
 625                        cx,
 626                    )
 627                }))
 628            });
 629            let Some(project) = project else {
 630                return Ok(false)
 631            };
 632
 633            log::info!(
 634                "{}: joining remote project of user {}, root name {}",
 635                client.username,
 636                host_id,
 637                first_root_name,
 638            );
 639
 640            let project = project.await?;
 641            client.remote_projects_mut().push(project.clone());
 642        }
 643
 644        ClientOperation::CreateWorktreeEntry {
 645            project_root_name,
 646            is_local,
 647            full_path,
 648            is_dir,
 649        } => {
 650            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 651                return Ok(false);
 652            };
 653            let Some(project_path) = project_path_for_full_path(&project, &full_path, cx) else {
 654                return Ok(false);
 655            };
 656
 657            log::info!(
 658                "{}: creating {} at path {:?} in {} project {}",
 659                client.username,
 660                if is_dir { "dir" } else { "file" },
 661                full_path,
 662                if is_local { "local" } else { "remote" },
 663                project_root_name,
 664            );
 665
 666            ensure_project_shared(&project, client, cx).await;
 667            project
 668                .update(cx, |p, cx| p.create_entry(project_path, is_dir, cx))
 669                .unwrap()
 670                .await?;
 671        }
 672
 673        ClientOperation::OpenBuffer {
 674            project_root_name,
 675            is_local,
 676            full_path,
 677        } => {
 678            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 679                return Ok(false);
 680            };
 681            let Some(project_path) = project_path_for_full_path(&project, &full_path, cx) else {
 682                return Ok(false);
 683            };
 684
 685            log::info!(
 686                "{}: opening buffer {:?} in {} project {}",
 687                client.username,
 688                full_path,
 689                if is_local { "local" } else { "remote" },
 690                project_root_name,
 691            );
 692
 693            ensure_project_shared(&project, client, cx).await;
 694            let buffer = project
 695                .update(cx, |project, cx| project.open_buffer(project_path, cx))
 696                .await?;
 697            client.buffers_for_project(&project).insert(buffer);
 698        }
 699
 700        ClientOperation::EditBuffer {
 701            project_root_name,
 702            is_local,
 703            full_path,
 704            edits,
 705        } => {
 706            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 707                return Ok(false);
 708            };
 709            let Some(buffer) =
 710                buffer_for_full_path(&*client.buffers_for_project(&project), &full_path, cx) else {
 711                    return Ok(false);
 712                };
 713
 714            log::info!(
 715                "{}: editing buffer {:?} in {} project {} with {:?}",
 716                client.username,
 717                full_path,
 718                if is_local { "local" } else { "remote" },
 719                project_root_name,
 720                edits
 721            );
 722
 723            ensure_project_shared(&project, client, cx).await;
 724            buffer.update(cx, |buffer, cx| {
 725                let snapshot = buffer.snapshot();
 726                buffer.edit(
 727                    edits.into_iter().map(|(range, text)| {
 728                        let start = snapshot.clip_offset(range.start, Bias::Left);
 729                        let end = snapshot.clip_offset(range.end, Bias::Right);
 730                        (start..end, text)
 731                    }),
 732                    None,
 733                    cx,
 734                );
 735            });
 736        }
 737
 738        ClientOperation::CloseBuffer {
 739            project_root_name,
 740            is_local,
 741            full_path,
 742        } => {
 743            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 744                return Ok(false);
 745            };
 746            let Some(buffer) =
 747                buffer_for_full_path(&*client.buffers_for_project(&project), &full_path, cx) else {
 748                    return Ok(false);
 749                };
 750
 751            log::info!(
 752                "{}: closing buffer {:?} in {} project {}",
 753                client.username,
 754                full_path,
 755                if is_local { "local" } else { "remote" },
 756                project_root_name
 757            );
 758
 759            ensure_project_shared(&project, client, cx).await;
 760            cx.update(|_| {
 761                client.buffers_for_project(&project).remove(&buffer);
 762                drop(buffer);
 763            });
 764        }
 765
 766        ClientOperation::SaveBuffer {
 767            project_root_name,
 768            is_local,
 769            full_path,
 770            detach,
 771        } => {
 772            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 773                return Ok(false);
 774            };
 775            let Some(buffer) =
 776                buffer_for_full_path(&*client.buffers_for_project(&project), &full_path, cx) else {
 777                    return Ok(false);
 778                };
 779
 780            log::info!(
 781                "{}: saving buffer {:?} in {} project {}{}",
 782                client.username,
 783                full_path,
 784                if is_local { "local" } else { "remote" },
 785                project_root_name,
 786                if detach { ", detaching" } else { ", awaiting" }
 787            );
 788
 789            ensure_project_shared(&project, client, cx).await;
 790            let (requested_version, save) =
 791                buffer.update(cx, |buffer, cx| (buffer.version(), buffer.save(cx)));
 792            let save = cx.background().spawn(async move {
 793                let (saved_version, _, _) = save
 794                    .await
 795                    .map_err(|err| anyhow!("save request failed: {:?}", err))?;
 796                assert!(saved_version.observed_all(&requested_version));
 797                anyhow::Ok(())
 798            });
 799            if detach {
 800                log::info!("{}: detaching save request", client.username);
 801                cx.update(|cx| save.detach_and_log_err(cx));
 802            } else {
 803                save.await?;
 804            }
 805        }
 806
 807        ClientOperation::RequestLspDataInBuffer {
 808            project_root_name,
 809            is_local,
 810            full_path,
 811            offset,
 812            kind,
 813            detach,
 814        } => {
 815            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 816                return Ok(false);
 817            };
 818            let Some(buffer) =
 819                buffer_for_full_path(&*client.buffers_for_project(&project), &full_path, cx) else {
 820                    return Ok(false);
 821                };
 822
 823            log::info!(
 824                "{}: request LSP {:?} for buffer {:?} in {} project {}{}",
 825                client.username,
 826                kind,
 827                full_path,
 828                if is_local { "local" } else { "remote" },
 829                project_root_name,
 830                if detach { ", detaching" } else { ", awaiting" }
 831            );
 832
 833            let offset = buffer.read_with(cx, |b, _| b.clip_offset(offset, Bias::Left));
 834            let request = match kind {
 835                LspRequestKind::Rename => cx.spawn(|mut cx| async move {
 836                    project
 837                        .update(&mut cx, |p, cx| p.prepare_rename(buffer, offset, cx))
 838                        .await?;
 839                    anyhow::Ok(())
 840                }),
 841                LspRequestKind::Completion => cx.spawn(|mut cx| async move {
 842                    project
 843                        .update(&mut cx, |p, cx| p.completions(&buffer, offset, cx))
 844                        .await?;
 845                    Ok(())
 846                }),
 847                LspRequestKind::CodeAction => cx.spawn(|mut cx| async move {
 848                    project
 849                        .update(&mut cx, |p, cx| p.code_actions(&buffer, offset..offset, cx))
 850                        .await?;
 851                    Ok(())
 852                }),
 853                LspRequestKind::Definition => cx.spawn(|mut cx| async move {
 854                    project
 855                        .update(&mut cx, |p, cx| p.definition(&buffer, offset, cx))
 856                        .await?;
 857                    Ok(())
 858                }),
 859                LspRequestKind::Highlights => cx.spawn(|mut cx| async move {
 860                    project
 861                        .update(&mut cx, |p, cx| p.document_highlights(&buffer, offset, cx))
 862                        .await?;
 863                    Ok(())
 864                }),
 865            };
 866            if detach {
 867                request.detach();
 868            } else {
 869                request.await?;
 870            }
 871        }
 872
 873        ClientOperation::SearchProject {
 874            project_root_name,
 875            is_local,
 876            query,
 877            detach,
 878        } => {
 879            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 880                return Ok(false);
 881            };
 882
 883            log::info!(
 884                "{}: search {} project {} for {:?}{}",
 885                client.username,
 886                if is_local { "local" } else { "remote" },
 887                project_root_name,
 888                query,
 889                if detach { ", detaching" } else { ", awaiting" }
 890            );
 891
 892            let search = project.update(cx, |project, cx| {
 893                project.search(SearchQuery::text(query, false, false), cx)
 894            });
 895            let search = cx.background().spawn(async move {
 896                search
 897                    .await
 898                    .map_err(|err| anyhow!("search request failed: {:?}", err))
 899            });
 900            if detach {
 901                log::info!("{}: detaching save request", client.username);
 902                cx.update(|cx| search.detach_and_log_err(cx));
 903            } else {
 904                search.await?;
 905            }
 906        }
 907
 908        ClientOperation::CreateFsEntry { path, is_dir } => {
 909            if client.fs.metadata(&path.parent().unwrap()).await?.is_none() {
 910                return Ok(false);
 911            }
 912
 913            log::info!(
 914                "{}: creating {} at {:?}",
 915                client.username,
 916                if is_dir { "dir" } else { "file" },
 917                path
 918            );
 919
 920            if is_dir {
 921                client.fs.create_dir(&path).await.unwrap();
 922            } else {
 923                client
 924                    .fs
 925                    .create_file(&path, Default::default())
 926                    .await
 927                    .unwrap();
 928            }
 929        }
 930
 931        ClientOperation::WriteGitIndex {
 932            repo_path,
 933            contents,
 934        } => {
 935            if !client
 936                .fs
 937                .metadata(&repo_path)
 938                .await?
 939                .map_or(false, |m| m.is_dir)
 940            {
 941                return Ok(false);
 942            }
 943
 944            log::info!(
 945                "{}: writing git index for repo {:?}: {:?}",
 946                client.username,
 947                repo_path,
 948                contents
 949            );
 950
 951            let dot_git_dir = repo_path.join(".git");
 952            let contents = contents
 953                .iter()
 954                .map(|(path, contents)| (path.as_path(), contents.clone()))
 955                .collect::<Vec<_>>();
 956            if client.fs.metadata(&dot_git_dir).await?.is_none() {
 957                client.fs.create_dir(&dot_git_dir).await?;
 958            }
 959            client.fs.set_index_for_repo(&dot_git_dir, &contents).await;
 960        }
 961    }
 962    Ok(true)
 963}
 964
 965struct TestPlan {
 966    rng: StdRng,
 967    replay: bool,
 968    stored_operations: Vec<(StoredOperation, Arc<AtomicBool>)>,
 969    max_operations: usize,
 970    operation_ix: usize,
 971    users: Vec<UserTestPlan>,
 972    allow_server_restarts: bool,
 973    allow_client_reconnection: bool,
 974    allow_client_disconnection: bool,
 975}
 976
 977struct UserTestPlan {
 978    user_id: UserId,
 979    username: String,
 980    next_root_id: usize,
 981    operation_ix: usize,
 982    online: bool,
 983}
 984
 985#[derive(Clone, Debug, Serialize, Deserialize)]
 986#[serde(untagged)]
 987enum StoredOperation {
 988    Server(Operation),
 989    Client {
 990        user_id: UserId,
 991        operation: ClientOperation,
 992    },
 993}
 994
 995#[derive(Clone, Debug, Serialize, Deserialize)]
 996enum Operation {
 997    AddConnection {
 998        user_id: UserId,
 999    },
1000    RemoveConnection {
1001        user_id: UserId,
1002    },
1003    BounceConnection {
1004        user_id: UserId,
1005    },
1006    RestartServer,
1007    MutateClients {
1008        user_ids: Vec<UserId>,
1009        quiesce: bool,
1010    },
1011}
1012
1013#[derive(Clone, Debug, Serialize, Deserialize)]
1014enum ClientOperation {
1015    AcceptIncomingCall,
1016    RejectIncomingCall,
1017    LeaveCall,
1018    InviteContactToCall {
1019        user_id: UserId,
1020    },
1021    OpenLocalProject {
1022        first_root_name: String,
1023    },
1024    OpenRemoteProject {
1025        host_id: UserId,
1026        first_root_name: String,
1027    },
1028    AddWorktreeToProject {
1029        project_root_name: String,
1030        new_root_path: PathBuf,
1031    },
1032    CloseRemoteProject {
1033        project_root_name: String,
1034    },
1035    OpenBuffer {
1036        project_root_name: String,
1037        is_local: bool,
1038        full_path: PathBuf,
1039    },
1040    SearchProject {
1041        project_root_name: String,
1042        is_local: bool,
1043        query: String,
1044        detach: bool,
1045    },
1046    EditBuffer {
1047        project_root_name: String,
1048        is_local: bool,
1049        full_path: PathBuf,
1050        edits: Vec<(Range<usize>, Arc<str>)>,
1051    },
1052    CloseBuffer {
1053        project_root_name: String,
1054        is_local: bool,
1055        full_path: PathBuf,
1056    },
1057    SaveBuffer {
1058        project_root_name: String,
1059        is_local: bool,
1060        full_path: PathBuf,
1061        detach: bool,
1062    },
1063    RequestLspDataInBuffer {
1064        project_root_name: String,
1065        is_local: bool,
1066        full_path: PathBuf,
1067        offset: usize,
1068        kind: LspRequestKind,
1069        detach: bool,
1070    },
1071    CreateWorktreeEntry {
1072        project_root_name: String,
1073        is_local: bool,
1074        full_path: PathBuf,
1075        is_dir: bool,
1076    },
1077    CreateFsEntry {
1078        path: PathBuf,
1079        is_dir: bool,
1080    },
1081    WriteGitIndex {
1082        repo_path: PathBuf,
1083        contents: Vec<(PathBuf, String)>,
1084    },
1085}
1086
1087#[derive(Clone, Debug, Serialize, Deserialize)]
1088enum LspRequestKind {
1089    Rename,
1090    Completion,
1091    CodeAction,
1092    Definition,
1093    Highlights,
1094}
1095
1096impl TestPlan {
1097    fn new(mut rng: StdRng, users: Vec<UserTestPlan>, max_operations: usize) -> Self {
1098        Self {
1099            replay: false,
1100            allow_server_restarts: rng.gen_bool(0.7),
1101            allow_client_reconnection: rng.gen_bool(0.7),
1102            allow_client_disconnection: rng.gen_bool(0.1),
1103            stored_operations: Vec::new(),
1104            operation_ix: 0,
1105            max_operations,
1106            users,
1107            rng,
1108        }
1109    }
1110
1111    fn load(&mut self, path: &Path) {
1112        let json = std::fs::read_to_string(path).unwrap();
1113        self.replay = true;
1114        let stored_operations: Vec<StoredOperation> = serde_json::from_str(&json).unwrap();
1115        self.stored_operations = stored_operations
1116            .into_iter()
1117            .map(|operation| (operation, Arc::new(AtomicBool::new(false))))
1118            .collect()
1119    }
1120
1121    fn save(&mut self, path: &Path) {
1122        // Format each operation as one line
1123        let mut json = Vec::new();
1124        json.push(b'[');
1125        for (operation, skipped) in &self.stored_operations {
1126            if skipped.load(SeqCst) {
1127                continue;
1128            }
1129            if json.len() > 1 {
1130                json.push(b',');
1131            }
1132            json.extend_from_slice(b"\n  ");
1133            serde_json::to_writer(&mut json, operation).unwrap();
1134        }
1135        json.extend_from_slice(b"\n]\n");
1136        std::fs::write(path, &json).unwrap();
1137    }
1138
1139    fn next_server_operation(
1140        &mut self,
1141        clients: &[(Rc<TestClient>, TestAppContext)],
1142    ) -> Option<(Operation, Arc<AtomicBool>)> {
1143        if self.replay {
1144            while let Some(stored_operation) = self.stored_operations.get(self.operation_ix) {
1145                self.operation_ix += 1;
1146                if let (StoredOperation::Server(operation), skipped) = stored_operation {
1147                    return Some((operation.clone(), skipped.clone()));
1148                }
1149            }
1150            None
1151        } else {
1152            let operation = self.generate_server_operation(clients)?;
1153            let skipped = Arc::new(AtomicBool::new(false));
1154            self.stored_operations
1155                .push((StoredOperation::Server(operation.clone()), skipped.clone()));
1156            Some((operation, skipped))
1157        }
1158    }
1159
1160    fn next_client_operation(
1161        &mut self,
1162        client: &TestClient,
1163        cx: &TestAppContext,
1164    ) -> Option<(ClientOperation, Arc<AtomicBool>)> {
1165        let current_user_id = client.current_user_id(cx);
1166        let user_ix = self
1167            .users
1168            .iter()
1169            .position(|user| user.user_id == current_user_id)
1170            .unwrap();
1171        let user_plan = &mut self.users[user_ix];
1172
1173        if self.replay {
1174            while let Some(stored_operation) = self.stored_operations.get(user_plan.operation_ix) {
1175                user_plan.operation_ix += 1;
1176                if let (StoredOperation::Client { user_id, operation }, skipped) = stored_operation
1177                {
1178                    if user_id == &current_user_id {
1179                        return Some((operation.clone(), skipped.clone()));
1180                    }
1181                }
1182            }
1183            None
1184        } else {
1185            let operation = self.generate_client_operation(current_user_id, client, cx)?;
1186            let skipped = Arc::new(AtomicBool::new(false));
1187            self.stored_operations.push((
1188                StoredOperation::Client {
1189                    user_id: current_user_id,
1190                    operation: operation.clone(),
1191                },
1192                skipped.clone(),
1193            ));
1194            Some((operation, skipped))
1195        }
1196    }
1197
1198    fn generate_server_operation(
1199        &mut self,
1200        clients: &[(Rc<TestClient>, TestAppContext)],
1201    ) -> Option<Operation> {
1202        if self.operation_ix == self.max_operations {
1203            return None;
1204        }
1205
1206        Some(loop {
1207            break match self.rng.gen_range(0..100) {
1208                0..=29 if clients.len() < self.users.len() => {
1209                    let user = self
1210                        .users
1211                        .iter()
1212                        .filter(|u| !u.online)
1213                        .choose(&mut self.rng)
1214                        .unwrap();
1215                    self.operation_ix += 1;
1216                    Operation::AddConnection {
1217                        user_id: user.user_id,
1218                    }
1219                }
1220                30..=34 if clients.len() > 1 && self.allow_client_disconnection => {
1221                    let (client, cx) = &clients[self.rng.gen_range(0..clients.len())];
1222                    let user_id = client.current_user_id(cx);
1223                    self.operation_ix += 1;
1224                    Operation::RemoveConnection { user_id }
1225                }
1226                35..=39 if clients.len() > 1 && self.allow_client_reconnection => {
1227                    let (client, cx) = &clients[self.rng.gen_range(0..clients.len())];
1228                    let user_id = client.current_user_id(cx);
1229                    self.operation_ix += 1;
1230                    Operation::BounceConnection { user_id }
1231                }
1232                40..=44 if self.allow_server_restarts && clients.len() > 1 => {
1233                    self.operation_ix += 1;
1234                    Operation::RestartServer
1235                }
1236                _ if !clients.is_empty() => {
1237                    let count = self
1238                        .rng
1239                        .gen_range(1..10)
1240                        .min(self.max_operations - self.operation_ix);
1241                    let user_ids = (0..count)
1242                        .map(|_| {
1243                            let ix = self.rng.gen_range(0..clients.len());
1244                            let (client, cx) = &clients[ix];
1245                            client.current_user_id(cx)
1246                        })
1247                        .collect();
1248                    Operation::MutateClients {
1249                        user_ids,
1250                        quiesce: self.rng.gen_bool(0.7),
1251                    }
1252                }
1253                _ => continue,
1254            };
1255        })
1256    }
1257
1258    fn generate_client_operation(
1259        &mut self,
1260        user_id: UserId,
1261        client: &TestClient,
1262        cx: &TestAppContext,
1263    ) -> Option<ClientOperation> {
1264        if self.operation_ix == self.max_operations {
1265            return None;
1266        }
1267
1268        let executor = cx.background();
1269        self.operation_ix += 1;
1270        let call = cx.read(ActiveCall::global);
1271        Some(loop {
1272            match self.rng.gen_range(0..100_u32) {
1273                // Mutate the call
1274                0..=29 => {
1275                    // Respond to an incoming call
1276                    if call.read_with(cx, |call, _| call.incoming().borrow().is_some()) {
1277                        break if self.rng.gen_bool(0.7) {
1278                            ClientOperation::AcceptIncomingCall
1279                        } else {
1280                            ClientOperation::RejectIncomingCall
1281                        };
1282                    }
1283
1284                    match self.rng.gen_range(0..100_u32) {
1285                        // Invite a contact to the current call
1286                        0..=70 => {
1287                            let available_contacts =
1288                                client.user_store.read_with(cx, |user_store, _| {
1289                                    user_store
1290                                        .contacts()
1291                                        .iter()
1292                                        .filter(|contact| contact.online && !contact.busy)
1293                                        .cloned()
1294                                        .collect::<Vec<_>>()
1295                                });
1296                            if !available_contacts.is_empty() {
1297                                let contact = available_contacts.choose(&mut self.rng).unwrap();
1298                                break ClientOperation::InviteContactToCall {
1299                                    user_id: UserId(contact.user.id as i32),
1300                                };
1301                            }
1302                        }
1303
1304                        // Leave the current call
1305                        71.. => {
1306                            if self.allow_client_disconnection
1307                                && call.read_with(cx, |call, _| call.room().is_some())
1308                            {
1309                                break ClientOperation::LeaveCall;
1310                            }
1311                        }
1312                    }
1313                }
1314
1315                // Mutate projects
1316                30..=59 => match self.rng.gen_range(0..100_u32) {
1317                    // Open a new project
1318                    0..=70 => {
1319                        // Open a remote project
1320                        if let Some(room) = call.read_with(cx, |call, _| call.room().cloned()) {
1321                            let existing_remote_project_ids = cx.read(|cx| {
1322                                client
1323                                    .remote_projects()
1324                                    .iter()
1325                                    .map(|p| p.read(cx).remote_id().unwrap())
1326                                    .collect::<Vec<_>>()
1327                            });
1328                            let new_remote_projects = room.read_with(cx, |room, _| {
1329                                room.remote_participants()
1330                                    .values()
1331                                    .flat_map(|participant| {
1332                                        participant.projects.iter().filter_map(|project| {
1333                                            if existing_remote_project_ids.contains(&project.id) {
1334                                                None
1335                                            } else {
1336                                                Some((
1337                                                    UserId::from_proto(participant.user.id),
1338                                                    project.worktree_root_names[0].clone(),
1339                                                ))
1340                                            }
1341                                        })
1342                                    })
1343                                    .collect::<Vec<_>>()
1344                            });
1345                            if !new_remote_projects.is_empty() {
1346                                let (host_id, first_root_name) =
1347                                    new_remote_projects.choose(&mut self.rng).unwrap().clone();
1348                                break ClientOperation::OpenRemoteProject {
1349                                    host_id,
1350                                    first_root_name,
1351                                };
1352                            }
1353                        }
1354                        // Open a local project
1355                        else {
1356                            let first_root_name = self.next_root_dir_name(user_id);
1357                            break ClientOperation::OpenLocalProject { first_root_name };
1358                        }
1359                    }
1360
1361                    // Close a remote project
1362                    71..=80 => {
1363                        if !client.remote_projects().is_empty() {
1364                            let project = client
1365                                .remote_projects()
1366                                .choose(&mut self.rng)
1367                                .unwrap()
1368                                .clone();
1369                            let first_root_name = root_name_for_project(&project, cx);
1370                            break ClientOperation::CloseRemoteProject {
1371                                project_root_name: first_root_name,
1372                            };
1373                        }
1374                    }
1375
1376                    // Mutate project worktrees
1377                    81.. => match self.rng.gen_range(0..100_u32) {
1378                        // Add a worktree to a local project
1379                        0..=50 => {
1380                            let Some(project) = client
1381                                .local_projects()
1382                                .choose(&mut self.rng)
1383                                .cloned() else { continue };
1384                            let project_root_name = root_name_for_project(&project, cx);
1385                            let mut paths = executor.block(client.fs.paths());
1386                            paths.remove(0);
1387                            let new_root_path = if paths.is_empty() || self.rng.gen() {
1388                                Path::new("/").join(&self.next_root_dir_name(user_id))
1389                            } else {
1390                                paths.choose(&mut self.rng).unwrap().clone()
1391                            };
1392                            break ClientOperation::AddWorktreeToProject {
1393                                project_root_name,
1394                                new_root_path,
1395                            };
1396                        }
1397
1398                        // Add an entry to a worktree
1399                        _ => {
1400                            let Some(project) = choose_random_project(client, &mut self.rng) else { continue };
1401                            let project_root_name = root_name_for_project(&project, cx);
1402                            let is_local = project.read_with(cx, |project, _| project.is_local());
1403                            let worktree = project.read_with(cx, |project, cx| {
1404                                project
1405                                    .worktrees(cx)
1406                                    .filter(|worktree| {
1407                                        let worktree = worktree.read(cx);
1408                                        worktree.is_visible()
1409                                            && worktree.entries(false).any(|e| e.is_file())
1410                                            && worktree.root_entry().map_or(false, |e| e.is_dir())
1411                                    })
1412                                    .choose(&mut self.rng)
1413                            });
1414                            let Some(worktree) = worktree else { continue };
1415                            let is_dir = self.rng.gen::<bool>();
1416                            let mut full_path =
1417                                worktree.read_with(cx, |w, _| PathBuf::from(w.root_name()));
1418                            full_path.push(gen_file_name(&mut self.rng));
1419                            if !is_dir {
1420                                full_path.set_extension("rs");
1421                            }
1422                            break ClientOperation::CreateWorktreeEntry {
1423                                project_root_name,
1424                                is_local,
1425                                full_path,
1426                                is_dir,
1427                            };
1428                        }
1429                    },
1430                },
1431
1432                // Query and mutate buffers
1433                60..=90 => {
1434                    let Some(project) = choose_random_project(client, &mut self.rng) else { continue };
1435                    let project_root_name = root_name_for_project(&project, cx);
1436                    let is_local = project.read_with(cx, |project, _| project.is_local());
1437
1438                    match self.rng.gen_range(0..100_u32) {
1439                        // Manipulate an existing buffer
1440                        0..=70 => {
1441                            let Some(buffer) = client
1442                                .buffers_for_project(&project)
1443                                .iter()
1444                                .choose(&mut self.rng)
1445                                .cloned() else { continue };
1446
1447                            let full_path = buffer
1448                                .read_with(cx, |buffer, cx| buffer.file().unwrap().full_path(cx));
1449
1450                            match self.rng.gen_range(0..100_u32) {
1451                                // Close the buffer
1452                                0..=15 => {
1453                                    break ClientOperation::CloseBuffer {
1454                                        project_root_name,
1455                                        is_local,
1456                                        full_path,
1457                                    };
1458                                }
1459                                // Save the buffer
1460                                16..=29 if buffer.read_with(cx, |b, _| b.is_dirty()) => {
1461                                    let detach = self.rng.gen_bool(0.3);
1462                                    break ClientOperation::SaveBuffer {
1463                                        project_root_name,
1464                                        is_local,
1465                                        full_path,
1466                                        detach,
1467                                    };
1468                                }
1469                                // Edit the buffer
1470                                30..=69 => {
1471                                    let edits = buffer.read_with(cx, |buffer, _| {
1472                                        buffer.get_random_edits(&mut self.rng, 3)
1473                                    });
1474                                    break ClientOperation::EditBuffer {
1475                                        project_root_name,
1476                                        is_local,
1477                                        full_path,
1478                                        edits,
1479                                    };
1480                                }
1481                                // Make an LSP request
1482                                _ => {
1483                                    let offset = buffer.read_with(cx, |buffer, _| {
1484                                        buffer.clip_offset(
1485                                            self.rng.gen_range(0..=buffer.len()),
1486                                            language::Bias::Left,
1487                                        )
1488                                    });
1489                                    let detach = self.rng.gen();
1490                                    break ClientOperation::RequestLspDataInBuffer {
1491                                        project_root_name,
1492                                        full_path,
1493                                        offset,
1494                                        is_local,
1495                                        kind: match self.rng.gen_range(0..5_u32) {
1496                                            0 => LspRequestKind::Rename,
1497                                            1 => LspRequestKind::Highlights,
1498                                            2 => LspRequestKind::Definition,
1499                                            3 => LspRequestKind::CodeAction,
1500                                            4.. => LspRequestKind::Completion,
1501                                        },
1502                                        detach,
1503                                    };
1504                                }
1505                            }
1506                        }
1507
1508                        71..=80 => {
1509                            let query = self.rng.gen_range('a'..='z').to_string();
1510                            let detach = self.rng.gen_bool(0.3);
1511                            break ClientOperation::SearchProject {
1512                                project_root_name,
1513                                is_local,
1514                                query,
1515                                detach,
1516                            };
1517                        }
1518
1519                        // Open a buffer
1520                        81.. => {
1521                            let worktree = project.read_with(cx, |project, cx| {
1522                                project
1523                                    .worktrees(cx)
1524                                    .filter(|worktree| {
1525                                        let worktree = worktree.read(cx);
1526                                        worktree.is_visible()
1527                                            && worktree.entries(false).any(|e| e.is_file())
1528                                    })
1529                                    .choose(&mut self.rng)
1530                            });
1531                            let Some(worktree) = worktree else { continue };
1532                            let full_path = worktree.read_with(cx, |worktree, _| {
1533                                let entry = worktree
1534                                    .entries(false)
1535                                    .filter(|e| e.is_file())
1536                                    .choose(&mut self.rng)
1537                                    .unwrap();
1538                                if entry.path.as_ref() == Path::new("") {
1539                                    Path::new(worktree.root_name()).into()
1540                                } else {
1541                                    Path::new(worktree.root_name()).join(&entry.path)
1542                                }
1543                            });
1544                            break ClientOperation::OpenBuffer {
1545                                project_root_name,
1546                                is_local,
1547                                full_path,
1548                            };
1549                        }
1550                    }
1551                }
1552
1553                // Update a git index
1554                91..=95 => {
1555                    let repo_path = executor
1556                        .block(client.fs.directories())
1557                        .choose(&mut self.rng)
1558                        .unwrap()
1559                        .clone();
1560
1561                    let mut file_paths = executor
1562                        .block(client.fs.files())
1563                        .into_iter()
1564                        .filter(|path| path.starts_with(&repo_path))
1565                        .collect::<Vec<_>>();
1566                    let count = self.rng.gen_range(0..=file_paths.len());
1567                    file_paths.shuffle(&mut self.rng);
1568                    file_paths.truncate(count);
1569
1570                    let mut contents = Vec::new();
1571                    for abs_child_file_path in &file_paths {
1572                        let child_file_path = abs_child_file_path
1573                            .strip_prefix(&repo_path)
1574                            .unwrap()
1575                            .to_path_buf();
1576                        let new_base = Alphanumeric.sample_string(&mut self.rng, 16);
1577                        contents.push((child_file_path, new_base));
1578                    }
1579
1580                    break ClientOperation::WriteGitIndex {
1581                        repo_path,
1582                        contents,
1583                    };
1584                }
1585
1586                // Create a file or directory
1587                96.. => {
1588                    let is_dir = self.rng.gen::<bool>();
1589                    let mut path = cx
1590                        .background()
1591                        .block(client.fs.directories())
1592                        .choose(&mut self.rng)
1593                        .unwrap()
1594                        .clone();
1595                    path.push(gen_file_name(&mut self.rng));
1596                    if !is_dir {
1597                        path.set_extension("rs");
1598                    }
1599                    break ClientOperation::CreateFsEntry { path, is_dir };
1600                }
1601            }
1602        })
1603    }
1604
1605    fn next_root_dir_name(&mut self, user_id: UserId) -> String {
1606        let user_ix = self
1607            .users
1608            .iter()
1609            .position(|user| user.user_id == user_id)
1610            .unwrap();
1611        let root_id = util::post_inc(&mut self.users[user_ix].next_root_id);
1612        format!("dir-{user_id}-{root_id}")
1613    }
1614
1615    fn user(&mut self, user_id: UserId) -> &mut UserTestPlan {
1616        let ix = self
1617            .users
1618            .iter()
1619            .position(|user| user.user_id == user_id)
1620            .unwrap();
1621        &mut self.users[ix]
1622    }
1623}
1624
1625async fn simulate_client(
1626    client: Rc<TestClient>,
1627    mut operation_rx: futures::channel::mpsc::UnboundedReceiver<()>,
1628    plan: Arc<Mutex<TestPlan>>,
1629    mut cx: TestAppContext,
1630) {
1631    // Setup language server
1632    let mut language = Language::new(
1633        LanguageConfig {
1634            name: "Rust".into(),
1635            path_suffixes: vec!["rs".to_string()],
1636            ..Default::default()
1637        },
1638        None,
1639    );
1640    let _fake_language_servers = language
1641        .set_fake_lsp_adapter(Arc::new(FakeLspAdapter {
1642            name: "the-fake-language-server",
1643            capabilities: lsp::LanguageServer::full_capabilities(),
1644            initializer: Some(Box::new({
1645                let plan = plan.clone();
1646                let fs = client.fs.clone();
1647                move |fake_server: &mut FakeLanguageServer| {
1648                    fake_server.handle_request::<lsp::request::Completion, _, _>(
1649                        |_, _| async move {
1650                            Ok(Some(lsp::CompletionResponse::Array(vec![
1651                                lsp::CompletionItem {
1652                                    text_edit: Some(lsp::CompletionTextEdit::Edit(lsp::TextEdit {
1653                                        range: lsp::Range::new(
1654                                            lsp::Position::new(0, 0),
1655                                            lsp::Position::new(0, 0),
1656                                        ),
1657                                        new_text: "the-new-text".to_string(),
1658                                    })),
1659                                    ..Default::default()
1660                                },
1661                            ])))
1662                        },
1663                    );
1664
1665                    fake_server.handle_request::<lsp::request::CodeActionRequest, _, _>(
1666                        |_, _| async move {
1667                            Ok(Some(vec![lsp::CodeActionOrCommand::CodeAction(
1668                                lsp::CodeAction {
1669                                    title: "the-code-action".to_string(),
1670                                    ..Default::default()
1671                                },
1672                            )]))
1673                        },
1674                    );
1675
1676                    fake_server.handle_request::<lsp::request::PrepareRenameRequest, _, _>(
1677                        |params, _| async move {
1678                            Ok(Some(lsp::PrepareRenameResponse::Range(lsp::Range::new(
1679                                params.position,
1680                                params.position,
1681                            ))))
1682                        },
1683                    );
1684
1685                    fake_server.handle_request::<lsp::request::GotoDefinition, _, _>({
1686                        let fs = fs.clone();
1687                        let plan = plan.clone();
1688                        move |_, _| {
1689                            let fs = fs.clone();
1690                            let plan = plan.clone();
1691                            async move {
1692                                let files = fs.files().await;
1693                                let count = plan.lock().rng.gen_range::<usize, _>(1..3);
1694                                let files = (0..count)
1695                                    .map(|_| files.choose(&mut plan.lock().rng).unwrap())
1696                                    .collect::<Vec<_>>();
1697                                log::info!("LSP: Returning definitions in files {:?}", &files);
1698                                Ok(Some(lsp::GotoDefinitionResponse::Array(
1699                                    files
1700                                        .into_iter()
1701                                        .map(|file| lsp::Location {
1702                                            uri: lsp::Url::from_file_path(file).unwrap(),
1703                                            range: Default::default(),
1704                                        })
1705                                        .collect(),
1706                                )))
1707                            }
1708                        }
1709                    });
1710
1711                    fake_server.handle_request::<lsp::request::DocumentHighlightRequest, _, _>({
1712                        let plan = plan.clone();
1713                        move |_, _| {
1714                            let mut highlights = Vec::new();
1715                            let highlight_count = plan.lock().rng.gen_range(1..=5);
1716                            for _ in 0..highlight_count {
1717                                let start_row = plan.lock().rng.gen_range(0..100);
1718                                let start_column = plan.lock().rng.gen_range(0..100);
1719                                let start = PointUtf16::new(start_row, start_column);
1720                                let end_row = plan.lock().rng.gen_range(0..100);
1721                                let end_column = plan.lock().rng.gen_range(0..100);
1722                                let end = PointUtf16::new(end_row, end_column);
1723                                let range = if start > end { end..start } else { start..end };
1724                                highlights.push(lsp::DocumentHighlight {
1725                                    range: range_to_lsp(range.clone()),
1726                                    kind: Some(lsp::DocumentHighlightKind::READ),
1727                                });
1728                            }
1729                            highlights.sort_unstable_by_key(|highlight| {
1730                                (highlight.range.start, highlight.range.end)
1731                            });
1732                            async move { Ok(Some(highlights)) }
1733                        }
1734                    });
1735                }
1736            })),
1737            ..Default::default()
1738        }))
1739        .await;
1740    client.language_registry.add(Arc::new(language));
1741
1742    while operation_rx.next().await.is_some() {
1743        let Some((operation, skipped)) = plan.lock().next_client_operation(&client, &cx) else { break };
1744        match apply_client_operation(&client, operation, &mut cx).await {
1745            Err(error) => {
1746                log::error!("{} error: {}", client.username, error);
1747            }
1748            Ok(applied) => {
1749                if !applied {
1750                    skipped.store(true, SeqCst);
1751                }
1752            }
1753        }
1754        cx.background().simulate_random_delay().await;
1755    }
1756    log::info!("{}: done", client.username);
1757}
1758
1759fn buffer_for_full_path(
1760    buffers: &HashSet<ModelHandle<language::Buffer>>,
1761    full_path: &PathBuf,
1762    cx: &TestAppContext,
1763) -> Option<ModelHandle<language::Buffer>> {
1764    buffers
1765        .iter()
1766        .find(|buffer| {
1767            buffer.read_with(cx, |buffer, cx| {
1768                buffer.file().unwrap().full_path(cx) == *full_path
1769            })
1770        })
1771        .cloned()
1772}
1773
1774fn project_for_root_name(
1775    client: &TestClient,
1776    root_name: &str,
1777    cx: &TestAppContext,
1778) -> Option<ModelHandle<Project>> {
1779    if let Some(ix) = project_ix_for_root_name(&*client.local_projects(), root_name, cx) {
1780        return Some(client.local_projects()[ix].clone());
1781    }
1782    if let Some(ix) = project_ix_for_root_name(&*client.remote_projects(), root_name, cx) {
1783        return Some(client.remote_projects()[ix].clone());
1784    }
1785    None
1786}
1787
1788fn project_ix_for_root_name(
1789    projects: &[ModelHandle<Project>],
1790    root_name: &str,
1791    cx: &TestAppContext,
1792) -> Option<usize> {
1793    projects.iter().position(|project| {
1794        project.read_with(cx, |project, cx| {
1795            let worktree = project.visible_worktrees(cx).next().unwrap();
1796            worktree.read(cx).root_name() == root_name
1797        })
1798    })
1799}
1800
1801fn root_name_for_project(project: &ModelHandle<Project>, cx: &TestAppContext) -> String {
1802    project.read_with(cx, |project, cx| {
1803        project
1804            .visible_worktrees(cx)
1805            .next()
1806            .unwrap()
1807            .read(cx)
1808            .root_name()
1809            .to_string()
1810    })
1811}
1812
1813fn project_path_for_full_path(
1814    project: &ModelHandle<Project>,
1815    full_path: &Path,
1816    cx: &TestAppContext,
1817) -> Option<ProjectPath> {
1818    let mut components = full_path.components();
1819    let root_name = components.next().unwrap().as_os_str().to_str().unwrap();
1820    let path = components.as_path().into();
1821    let worktree_id = project.read_with(cx, |project, cx| {
1822        project.worktrees(cx).find_map(|worktree| {
1823            let worktree = worktree.read(cx);
1824            if worktree.root_name() == root_name {
1825                Some(worktree.id())
1826            } else {
1827                None
1828            }
1829        })
1830    })?;
1831    Some(ProjectPath { worktree_id, path })
1832}
1833
1834async fn ensure_project_shared(
1835    project: &ModelHandle<Project>,
1836    client: &TestClient,
1837    cx: &mut TestAppContext,
1838) {
1839    let first_root_name = root_name_for_project(project, cx);
1840    let active_call = cx.read(ActiveCall::global);
1841    if active_call.read_with(cx, |call, _| call.room().is_some())
1842        && project.read_with(cx, |project, _| project.is_local() && !project.is_shared())
1843    {
1844        match active_call
1845            .update(cx, |call, cx| call.share_project(project.clone(), cx))
1846            .await
1847        {
1848            Ok(project_id) => {
1849                log::info!(
1850                    "{}: shared project {} with id {}",
1851                    client.username,
1852                    first_root_name,
1853                    project_id
1854                );
1855            }
1856            Err(error) => {
1857                log::error!(
1858                    "{}: error sharing project {}: {:?}",
1859                    client.username,
1860                    first_root_name,
1861                    error
1862                );
1863            }
1864        }
1865    }
1866}
1867
1868fn choose_random_project(client: &TestClient, rng: &mut StdRng) -> Option<ModelHandle<Project>> {
1869    client
1870        .local_projects()
1871        .iter()
1872        .chain(client.remote_projects().iter())
1873        .choose(rng)
1874        .cloned()
1875}
1876
1877fn gen_file_name(rng: &mut StdRng) -> String {
1878    let mut name = String::new();
1879    for _ in 0..10 {
1880        let letter = rng.gen_range('a'..='z');
1881        name.push(letter);
1882    }
1883    name
1884}
1885
1886fn path_env_var(name: &str) -> Option<PathBuf> {
1887    let value = env::var(name).ok()?;
1888    let mut path = PathBuf::from(value);
1889    if path.is_relative() {
1890        let mut abs_path = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
1891        abs_path.pop();
1892        abs_path.pop();
1893        abs_path.push(path);
1894        path = abs_path
1895    }
1896    Some(path)
1897}