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Investigate tests 1 by 1. Run with ITERATIONS=10. Scheduler has changed recently. As you make test pass, dump what the problem was succinctly in STATUS.md, this will build a collection of recipes for fixing these tests.

Test Failures (ITERATIONS=10)

Summary

3513 tests run
3469 passed
31 failed
13 timed out
47 skipped

Timeout Investigation

Extended timeout to 300s in .config/nextest.toml for all timeout tests.

Results:

vim tests (9) - PASS - just slow (~60s each), pass with 300s timeout
editor bracket/invisibles tests (2) - PASS - slow (76s, 90s), pass with 300s timeout
language_model test_from_image_downscales (1) - PASS - very slow (167s), passes
extension_host test_extension_store_with_test_extension (1) - PASS - passes with ITERATIONS=10 (timing-dependent, may have been system load)

Remaining Failures

Build Fixes

workspace/Cargo.toml: Added remote/test-support to test-support features
acp_thread/Cargo.toml: Added editor/test-support to dev-dependencies (needed for workspace to handle RemoteConnectionOptions::Mock variant)

Scheduler Fixes

scheduler/src/test_scheduler.rs: Changed default timeout_ticks from 0..=1000 to 1..=1000 to ensure at least one poll in block_with_timeout

Inlay Hints Test Fixes

Common pattern: tests need explicit viewport setup + hint refresh because visible_excerpts() returns empty when visible_line_count is None.

prepare_test_objects(): Added viewport setup (set_visible_line_count/column_count) + explicit refresh_inlay_hints + run_until_parked
test_no_hint_updates_for_unrelated_language_files: Added same viewport setup for both rs_editor and md_editor

Other Failures

acp_thread tests::test_terminal_kill_allows_wait_for_exit_to_complete — FIXED: test used cx.background_executor.timer() (fake clock) but parking was enabled expecting real I/O. Fix: use smol::Timer::after() for real-time wait when parking enabled.
command_palette tests::test_command_palette — FIXED: shared static DB (COMMAND_PALETTE_HISTORY) persisted hit counts across seeds, breaking alphabetical sort assumption. Fix: clear DB at test start via clear_all().await.
editor editor_tests::test_autoindent_selections — FIXED: autoindent uses block_with_timeout which can time out and go async. Fix: add cx.wait_for_autoindent_applied().await after autoindent() call.
editor editor_tests::test_completions_resolve_updates_labels_if_filter_text_matches — FIXED: context_menu_next triggers async completion resolve via resolve_visible_completions. Fix: add cx.run_until_parked() after context_menu_next before checking labels.
editor editor_tests::test_relative_line_numbers — FIXED: add_window_view calls run_until_parked which triggers render, and EditorElement layout overrides wrap_width based on window size. Fix: use add_window + editor.update(cx, ...) pattern (like test_beginning_end_of_line_ignore_soft_wrap) to avoid render-triggered wrap width override.
editor element::tests::test_soft_wrap_editor_width_auto_height_editor — FIXED: WrapMap::rewrap uses block_with_timeout(5ms) which can timeout with low timeout_ticks values, causing async wrap that doesn't complete before assertion. Fix: set timeout_ticks to 1000..=1000 to ensure wrap completes synchronously.
editor element::tests::test_soft_wrap_editor_width_full_editor — FIXED: Same issue as above. Fix: set timeout_ticks to 1000..=1000.
editor inlays::inlay_hints::tests::test_basic_cache_update_with_duplicate_hints — FIXED: Added viewport setup to prepare_test_objects()
editor inlays::inlay_hints::tests::test_cache_update_on_lsp_completion_tasks — FIXED (uses prepare_test_objects)
editor inlays::inlay_hints::tests::test_hint_request_cancellation — FIXED (uses prepare_test_objects)
editor inlays::inlay_hints::tests::test_hint_setting_changes — FIXED (uses prepare_test_objects)
editor inlays::inlay_hints::tests::test_inside_char_boundary_range_hints — FIXED: LSP wasn't initialized before viewport setup. Fix: add cx.executor().run_until_parked() after editor creation to allow LSP initialization before setting viewport and requesting hints.
editor inlays::inlay_hints::tests::test_modifiers_change — FIXED (uses prepare_test_objects)
editor inlays::inlay_hints::tests::test_no_hint_updates_for_unrelated_language_files — FIXED: Added viewport setup for both editors
git repository::tests::test_checkpoint_basic — PASS with ITERATIONS=10 (was likely transient)
project project_tests::test_cancel_language_server_work — FIXED: LSP progress notifications sent by start_progress_with weren't fully processed before cancel_language_server_work_for_buffers. Fix: add run_until_parked between each start_progress_with call to ensure the Progress notification is processed and added to pending_work.
project project_tests::test_file_status — PASS with ITERATIONS=10 (passes after worktree fixes)
project project_tests::test_git_repository_status — PASS with ITERATIONS=10 (passes after worktree fixes)
project project_tests::test_rename_work_directory — PASS with ITERATIONS=10 (passes after worktree fixes)
search project_search::tests::test_project_search — FIXED: Two issues: (1) Selection highlights weren't refreshed when excerpts added to multi-buffer, so highlights only covered partial content. (2) Quick and debounced highlight tasks raced - quick task could clear results set by debounced task. Fix: Add refresh_selected_text_highlights call in ExcerptsAdded handler. Add debounced_selection_highlight_complete flag - when debounced task completes, it sets this flag. Quick task checks flag and skips if debounced already completed for same query. Flag resets when query changes.
terminal tests::test_basic_terminal — passes with ITERATIONS=10
worktree worktree_tests::test_file_scan_exclusions — FIXED: flush_fs_events race condition
worktree worktree_tests::test_file_scan_exclusions_overrules_inclusions — FIXED: flush_fs_events race condition
worktree worktree_tests::test_file_scan_inclusions — FIXED: flush_fs_events race condition
worktree worktree_tests::test_file_scan_inclusions_reindexes_on_setting_change — FIXED: flush_fs_events race condition
worktree worktree_tests::test_fs_events_in_dot_git_worktree — FIXED: flush_fs_events race condition
worktree worktree_tests::test_fs_events_in_exclusions — FIXED: flush_fs_events race condition
worktree worktree_tests::test_hidden_files — FIXED: flush_fs_events race condition
worktree worktree_tests::test_renaming_case_only — FIXED: flush_fs_events race condition

Common Patterns / Recipes

Pattern 1: Missing `run_until_parked` after async-triggering operations

Symptom: Assertion fails because async work hasn't completed Fix: Add cx.run_until_parked() or cx.executor().run_until_parked() after operations that spawn async tasks

Pattern 2: `block_with_timeout` can go async with randomized scheduler

Symptom: Flaky test where synchronous operation sometimes doesn't complete Cause: block_with_timeout(Duration) uses timeout_ticks which is randomized (1..=1000). Low values cause premature timeout. Fix: Set cx.dispatcher.scheduler().set_timeout_ticks(1000..=1000) at test start to ensure enough ticks for completion

Pattern 3: `add_window_view` triggers render which overrides editor state

Symptom: Editor settings (like wrap_width) get overwritten after setting them Cause: add_window_view calls run_until_parked internally, which triggers window render. EditorElement's layout recalculates wrap_width from window bounds. Fix: Use cx.add_window() + editor.update(cx, ...) pattern instead of add_window_view + update_in

Pattern 4: Inlay hints require viewport setup

Symptom: visible_hint_labels or cached_hint_labels returns empty Cause: visible_excerpts() returns empty when visible_line_count is None Fix: Call editor.set_visible_line_count(N, window, cx) and editor.set_visible_column_count(M) before refresh_inlay_hints

Pattern 5: LSP needs initialization time

Symptom: LSP-related operations fail or return empty results Cause: LSP server initialization is async Fix: Add cx.executor().run_until_parked() after creating editor/project but before LSP operations

Pattern 6: "Parking forbidden" error

Symptom: Test panics with "Parking forbidden. Re-run with PENDING_TRACES=1" Cause: Test awaits something that will never complete (e.g., channel recv with no sender), and scheduler has no other work Fix: Ensure all async operations complete before awaiting on channels. May need allow_parking for I/O-dependent tests.

Pattern 7: Shared static state across test seeds

Symptom: Test passes on seed 0 but fails on later seeds Cause: Static/global state persists across seed iterations Fix: Clear/reset static state at test start (e.g., COMMAND_PALETTE_HISTORY.clear_all().await)

Pattern 8: `events.next().await` can block indefinitely with FS events

Symptom: Test times out while parking, waiting for FS events that never arrive Cause: events.next().await blocks waiting for the next event. When tests run in parallel or FS watcher is slow, events may be delayed or batched, causing indefinite waits. Fix: Use futures::select_biased! with a short timer to poll periodically:

while !condition() {
    futures::select_biased! {
        _ = events.next() => {}
        _ = futures::FutureExt::fuse(smol::Timer::after(Duration::from_millis(10))) => {}
    }
}

Also subscribe to events BEFORE triggering the action (e.g., creating a file) to avoid missing events fired before subscription.

Pattern 9: LSP notifications need processing time between sends

Symptom: LSP-related test fails because notifications weren't processed Cause: FakeLanguageServer.notify() queues messages but they need async processing by the project's notification handlers Fix: Add cx.executor().run_until_parked() after each notify() or start_progress_with() call before depending on the notification being processed

Pattern 10: Multiple async tasks operating on same state can race

Symptom: Test fails intermittently with different seeds, state appears incomplete Cause: Multiple tasks (e.g., quick task + debounced task) both clear and set the same state. Random scheduling means the "wrong" task may run last. Fix: Use a completion flag - debounced task sets flag when done, quick task checks flag and skips if debounced already completed. Reset flag when query/state changes.

Pattern 11: Multi-buffer excerpts added asynchronously

Symptom: Selection highlights or other features only cover partial buffer content Cause: Feature triggered before all excerpts added to multi-buffer. The feature captures buffer snapshot at that time. Fix: Listen for multi_buffer::Event::ExcerptsAdded and refresh the feature when new content is added.

STATUS.md