1use super::{network::Network, *};
2use clock::ReplicaId;
3use rand::prelude::*;
4use std::{
5 cmp::Ordering,
6 env,
7 iter::Iterator,
8 time::{Duration, Instant},
9};
10
11#[cfg(test)]
12#[ctor::ctor]
13fn init_logger() {
14 if std::env::var("RUST_LOG").is_ok() {
15 env_logger::init();
16 }
17}
18
19#[test]
20fn test_edit() {
21 let mut buffer = Buffer::new(0, 0, "abc".into());
22 assert_eq!(buffer.text(), "abc");
23 buffer.edit([(3..3, "def")]);
24 assert_eq!(buffer.text(), "abcdef");
25 buffer.edit([(0..0, "ghi")]);
26 assert_eq!(buffer.text(), "ghiabcdef");
27 buffer.edit([(5..5, "jkl")]);
28 assert_eq!(buffer.text(), "ghiabjklcdef");
29 buffer.edit([(6..7, "")]);
30 assert_eq!(buffer.text(), "ghiabjlcdef");
31 buffer.edit([(4..9, "mno")]);
32 assert_eq!(buffer.text(), "ghiamnoef");
33}
34
35#[gpui::test(iterations = 100)]
36fn test_random_edits(mut rng: StdRng) {
37 let operations = env::var("OPERATIONS")
38 .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
39 .unwrap_or(10);
40
41 let reference_string_len = rng.gen_range(0..3);
42 let mut reference_string = RandomCharIter::new(&mut rng)
43 .take(reference_string_len)
44 .collect::<String>();
45 let mut buffer = Buffer::new(0, 0, reference_string.clone().into());
46 buffer.history.group_interval = Duration::from_millis(rng.gen_range(0..=200));
47 let mut buffer_versions = Vec::new();
48 log::info!(
49 "buffer text {:?}, version: {:?}",
50 buffer.text(),
51 buffer.version()
52 );
53
54 for _i in 0..operations {
55 let (edits, _) = buffer.randomly_edit(&mut rng, 5);
56 for (old_range, new_text) in edits.iter().rev() {
57 reference_string.replace_range(old_range.clone(), &new_text);
58 }
59 assert_eq!(buffer.text(), reference_string);
60 log::info!(
61 "buffer text {:?}, version: {:?}",
62 buffer.text(),
63 buffer.version()
64 );
65
66 if rng.gen_bool(0.25) {
67 buffer.randomly_undo_redo(&mut rng);
68 reference_string = buffer.text();
69 log::info!(
70 "buffer text {:?}, version: {:?}",
71 buffer.text(),
72 buffer.version()
73 );
74 }
75
76 let range = buffer.random_byte_range(0, &mut rng);
77 assert_eq!(
78 buffer.text_summary_for_range::<TextSummary, _>(range.clone()),
79 TextSummary::from(&reference_string[range])
80 );
81
82 buffer.check_invariants();
83
84 if rng.gen_bool(0.3) {
85 buffer_versions.push((buffer.clone(), buffer.subscribe()));
86 }
87 }
88
89 for (old_buffer, subscription) in buffer_versions {
90 let edits = buffer
91 .edits_since::<usize>(&old_buffer.version)
92 .collect::<Vec<_>>();
93
94 log::info!(
95 "applying edits since version {:?} to old text: {:?}: {:?}",
96 old_buffer.version(),
97 old_buffer.text(),
98 edits,
99 );
100
101 let mut text = old_buffer.visible_text.clone();
102 for edit in edits {
103 let new_text: String = buffer.text_for_range(edit.new.clone()).collect();
104 text.replace(edit.new.start..edit.new.start + edit.old.len(), &new_text);
105 }
106 assert_eq!(text.to_string(), buffer.text());
107
108 for _ in 0..5 {
109 let end_ix = old_buffer.clip_offset(rng.gen_range(0..=old_buffer.len()), Bias::Right);
110 let start_ix = old_buffer.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
111 let range = old_buffer.anchor_before(start_ix)..old_buffer.anchor_after(end_ix);
112 let mut old_text = old_buffer.text_for_range(range.clone()).collect::<String>();
113 let edits = buffer
114 .edits_since_in_range::<usize>(&old_buffer.version, range.clone())
115 .collect::<Vec<_>>();
116 log::info!(
117 "applying edits since version {:?} to old text in range {:?}: {:?}: {:?}",
118 old_buffer.version(),
119 start_ix..end_ix,
120 old_text,
121 edits,
122 );
123
124 let new_text = buffer.text_for_range(range).collect::<String>();
125 for edit in edits {
126 old_text.replace_range(
127 edit.new.start..edit.new.start + edit.old_len(),
128 &new_text[edit.new],
129 );
130 }
131 assert_eq!(old_text, new_text);
132 }
133
134 let subscription_edits = subscription.consume();
135 log::info!(
136 "applying subscription edits since version {:?} to old text: {:?}: {:?}",
137 old_buffer.version(),
138 old_buffer.text(),
139 subscription_edits,
140 );
141
142 let mut text = old_buffer.visible_text.clone();
143 for edit in subscription_edits.into_inner() {
144 let new_text: String = buffer.text_for_range(edit.new.clone()).collect();
145 text.replace(edit.new.start..edit.new.start + edit.old.len(), &new_text);
146 }
147 assert_eq!(text.to_string(), buffer.text());
148 }
149}
150
151#[test]
152fn test_line_len() {
153 let mut buffer = Buffer::new(0, 0, "".into());
154 buffer.edit([(0..0, "abcd\nefg\nhij")]);
155 buffer.edit([(12..12, "kl\nmno")]);
156 buffer.edit([(18..18, "\npqrs\n")]);
157 buffer.edit([(18..21, "\nPQ")]);
158
159 assert_eq!(buffer.line_len(0), 4);
160 assert_eq!(buffer.line_len(1), 3);
161 assert_eq!(buffer.line_len(2), 5);
162 assert_eq!(buffer.line_len(3), 3);
163 assert_eq!(buffer.line_len(4), 4);
164 assert_eq!(buffer.line_len(5), 0);
165}
166
167#[test]
168fn test_common_prefix_at_positionn() {
169 let text = "a = str; b = δα";
170 let buffer = Buffer::new(0, 0, text.into());
171
172 let offset1 = offset_after(text, "str");
173 let offset2 = offset_after(text, "δα");
174
175 // the preceding word is a prefix of the suggestion
176 assert_eq!(
177 buffer.common_prefix_at(offset1, "string"),
178 range_of(text, "str"),
179 );
180 // a suffix of the preceding word is a prefix of the suggestion
181 assert_eq!(
182 buffer.common_prefix_at(offset1, "tree"),
183 range_of(text, "tr"),
184 );
185 // the preceding word is a substring of the suggestion, but not a prefix
186 assert_eq!(
187 buffer.common_prefix_at(offset1, "astro"),
188 empty_range_after(text, "str"),
189 );
190
191 // prefix matching is case insenstive.
192 assert_eq!(
193 buffer.common_prefix_at(offset1, "Strαngε"),
194 range_of(text, "str"),
195 );
196 assert_eq!(
197 buffer.common_prefix_at(offset2, "ΔΑΜΝ"),
198 range_of(text, "δα"),
199 );
200
201 fn offset_after(text: &str, part: &str) -> usize {
202 text.find(part).unwrap() + part.len()
203 }
204
205 fn empty_range_after(text: &str, part: &str) -> Range<usize> {
206 let offset = offset_after(text, part);
207 offset..offset
208 }
209
210 fn range_of(text: &str, part: &str) -> Range<usize> {
211 let start = text.find(part).unwrap();
212 start..start + part.len()
213 }
214}
215
216#[test]
217fn test_text_summary_for_range() {
218 let buffer = Buffer::new(0, 0, "ab\nefg\nhklm\nnopqrs\ntuvwxyz".into());
219 assert_eq!(
220 buffer.text_summary_for_range::<TextSummary, _>(1..3),
221 TextSummary {
222 bytes: 2,
223 lines: Point::new(1, 0),
224 lines_utf16: PointUtf16::new(1, 0),
225 first_line_chars: 1,
226 last_line_chars: 0,
227 longest_row: 0,
228 longest_row_chars: 1,
229 }
230 );
231 assert_eq!(
232 buffer.text_summary_for_range::<TextSummary, _>(1..12),
233 TextSummary {
234 bytes: 11,
235 lines: Point::new(3, 0),
236 lines_utf16: PointUtf16::new(3, 0),
237 first_line_chars: 1,
238 last_line_chars: 0,
239 longest_row: 2,
240 longest_row_chars: 4,
241 }
242 );
243 assert_eq!(
244 buffer.text_summary_for_range::<TextSummary, _>(0..20),
245 TextSummary {
246 bytes: 20,
247 lines: Point::new(4, 1),
248 lines_utf16: PointUtf16::new(4, 1),
249 first_line_chars: 2,
250 last_line_chars: 1,
251 longest_row: 3,
252 longest_row_chars: 6,
253 }
254 );
255 assert_eq!(
256 buffer.text_summary_for_range::<TextSummary, _>(0..22),
257 TextSummary {
258 bytes: 22,
259 lines: Point::new(4, 3),
260 lines_utf16: PointUtf16::new(4, 3),
261 first_line_chars: 2,
262 last_line_chars: 3,
263 longest_row: 3,
264 longest_row_chars: 6,
265 }
266 );
267 assert_eq!(
268 buffer.text_summary_for_range::<TextSummary, _>(7..22),
269 TextSummary {
270 bytes: 15,
271 lines: Point::new(2, 3),
272 lines_utf16: PointUtf16::new(2, 3),
273 first_line_chars: 4,
274 last_line_chars: 3,
275 longest_row: 1,
276 longest_row_chars: 6,
277 }
278 );
279}
280
281#[test]
282fn test_chars_at() {
283 let mut buffer = Buffer::new(0, 0, "".into());
284 buffer.edit([(0..0, "abcd\nefgh\nij")]);
285 buffer.edit([(12..12, "kl\nmno")]);
286 buffer.edit([(18..18, "\npqrs")]);
287 buffer.edit([(18..21, "\nPQ")]);
288
289 let chars = buffer.chars_at(Point::new(0, 0));
290 assert_eq!(chars.collect::<String>(), "abcd\nefgh\nijkl\nmno\nPQrs");
291
292 let chars = buffer.chars_at(Point::new(1, 0));
293 assert_eq!(chars.collect::<String>(), "efgh\nijkl\nmno\nPQrs");
294
295 let chars = buffer.chars_at(Point::new(2, 0));
296 assert_eq!(chars.collect::<String>(), "ijkl\nmno\nPQrs");
297
298 let chars = buffer.chars_at(Point::new(3, 0));
299 assert_eq!(chars.collect::<String>(), "mno\nPQrs");
300
301 let chars = buffer.chars_at(Point::new(4, 0));
302 assert_eq!(chars.collect::<String>(), "PQrs");
303
304 // Regression test:
305 let mut buffer = Buffer::new(0, 0, "".into());
306 buffer.edit([(0..0, "[workspace]\nmembers = [\n \"xray_core\",\n \"xray_server\",\n \"xray_cli\",\n \"xray_wasm\",\n]\n")]);
307 buffer.edit([(60..60, "\n")]);
308
309 let chars = buffer.chars_at(Point::new(6, 0));
310 assert_eq!(chars.collect::<String>(), " \"xray_wasm\",\n]\n");
311}
312
313#[test]
314fn test_anchors() {
315 let mut buffer = Buffer::new(0, 0, "".into());
316 buffer.edit([(0..0, "abc")]);
317 let left_anchor = buffer.anchor_before(2);
318 let right_anchor = buffer.anchor_after(2);
319
320 buffer.edit([(1..1, "def\n")]);
321 assert_eq!(buffer.text(), "adef\nbc");
322 assert_eq!(left_anchor.to_offset(&buffer), 6);
323 assert_eq!(right_anchor.to_offset(&buffer), 6);
324 assert_eq!(left_anchor.to_point(&buffer), Point { row: 1, column: 1 });
325 assert_eq!(right_anchor.to_point(&buffer), Point { row: 1, column: 1 });
326
327 buffer.edit([(2..3, "")]);
328 assert_eq!(buffer.text(), "adf\nbc");
329 assert_eq!(left_anchor.to_offset(&buffer), 5);
330 assert_eq!(right_anchor.to_offset(&buffer), 5);
331 assert_eq!(left_anchor.to_point(&buffer), Point { row: 1, column: 1 });
332 assert_eq!(right_anchor.to_point(&buffer), Point { row: 1, column: 1 });
333
334 buffer.edit([(5..5, "ghi\n")]);
335 assert_eq!(buffer.text(), "adf\nbghi\nc");
336 assert_eq!(left_anchor.to_offset(&buffer), 5);
337 assert_eq!(right_anchor.to_offset(&buffer), 9);
338 assert_eq!(left_anchor.to_point(&buffer), Point { row: 1, column: 1 });
339 assert_eq!(right_anchor.to_point(&buffer), Point { row: 2, column: 0 });
340
341 buffer.edit([(7..9, "")]);
342 assert_eq!(buffer.text(), "adf\nbghc");
343 assert_eq!(left_anchor.to_offset(&buffer), 5);
344 assert_eq!(right_anchor.to_offset(&buffer), 7);
345 assert_eq!(left_anchor.to_point(&buffer), Point { row: 1, column: 1 },);
346 assert_eq!(right_anchor.to_point(&buffer), Point { row: 1, column: 3 });
347
348 // Ensure anchoring to a point is equivalent to anchoring to an offset.
349 assert_eq!(
350 buffer.anchor_before(Point { row: 0, column: 0 }),
351 buffer.anchor_before(0)
352 );
353 assert_eq!(
354 buffer.anchor_before(Point { row: 0, column: 1 }),
355 buffer.anchor_before(1)
356 );
357 assert_eq!(
358 buffer.anchor_before(Point { row: 0, column: 2 }),
359 buffer.anchor_before(2)
360 );
361 assert_eq!(
362 buffer.anchor_before(Point { row: 0, column: 3 }),
363 buffer.anchor_before(3)
364 );
365 assert_eq!(
366 buffer.anchor_before(Point { row: 1, column: 0 }),
367 buffer.anchor_before(4)
368 );
369 assert_eq!(
370 buffer.anchor_before(Point { row: 1, column: 1 }),
371 buffer.anchor_before(5)
372 );
373 assert_eq!(
374 buffer.anchor_before(Point { row: 1, column: 2 }),
375 buffer.anchor_before(6)
376 );
377 assert_eq!(
378 buffer.anchor_before(Point { row: 1, column: 3 }),
379 buffer.anchor_before(7)
380 );
381 assert_eq!(
382 buffer.anchor_before(Point { row: 1, column: 4 }),
383 buffer.anchor_before(8)
384 );
385
386 // Comparison between anchors.
387 let anchor_at_offset_0 = buffer.anchor_before(0);
388 let anchor_at_offset_1 = buffer.anchor_before(1);
389 let anchor_at_offset_2 = buffer.anchor_before(2);
390
391 assert_eq!(
392 anchor_at_offset_0.cmp(&anchor_at_offset_0, &buffer),
393 Ordering::Equal
394 );
395 assert_eq!(
396 anchor_at_offset_1.cmp(&anchor_at_offset_1, &buffer),
397 Ordering::Equal
398 );
399 assert_eq!(
400 anchor_at_offset_2.cmp(&anchor_at_offset_2, &buffer),
401 Ordering::Equal
402 );
403
404 assert_eq!(
405 anchor_at_offset_0.cmp(&anchor_at_offset_1, &buffer),
406 Ordering::Less
407 );
408 assert_eq!(
409 anchor_at_offset_1.cmp(&anchor_at_offset_2, &buffer),
410 Ordering::Less
411 );
412 assert_eq!(
413 anchor_at_offset_0.cmp(&anchor_at_offset_2, &buffer),
414 Ordering::Less
415 );
416
417 assert_eq!(
418 anchor_at_offset_1.cmp(&anchor_at_offset_0, &buffer),
419 Ordering::Greater
420 );
421 assert_eq!(
422 anchor_at_offset_2.cmp(&anchor_at_offset_1, &buffer),
423 Ordering::Greater
424 );
425 assert_eq!(
426 anchor_at_offset_2.cmp(&anchor_at_offset_0, &buffer),
427 Ordering::Greater
428 );
429}
430
431#[test]
432fn test_anchors_at_start_and_end() {
433 let mut buffer = Buffer::new(0, 0, "".into());
434 let before_start_anchor = buffer.anchor_before(0);
435 let after_end_anchor = buffer.anchor_after(0);
436
437 buffer.edit([(0..0, "abc")]);
438 assert_eq!(buffer.text(), "abc");
439 assert_eq!(before_start_anchor.to_offset(&buffer), 0);
440 assert_eq!(after_end_anchor.to_offset(&buffer), 3);
441
442 let after_start_anchor = buffer.anchor_after(0);
443 let before_end_anchor = buffer.anchor_before(3);
444
445 buffer.edit([(3..3, "def")]);
446 buffer.edit([(0..0, "ghi")]);
447 assert_eq!(buffer.text(), "ghiabcdef");
448 assert_eq!(before_start_anchor.to_offset(&buffer), 0);
449 assert_eq!(after_start_anchor.to_offset(&buffer), 3);
450 assert_eq!(before_end_anchor.to_offset(&buffer), 6);
451 assert_eq!(after_end_anchor.to_offset(&buffer), 9);
452}
453
454#[test]
455fn test_undo_redo() {
456 let mut buffer = Buffer::new(0, 0, "1234".into());
457 // Set group interval to zero so as to not group edits in the undo stack.
458 buffer.history.group_interval = Duration::from_secs(0);
459
460 buffer.edit([(1..1, "abx")]);
461 buffer.edit([(3..4, "yzef")]);
462 buffer.edit([(3..5, "cd")]);
463 assert_eq!(buffer.text(), "1abcdef234");
464
465 let entries = buffer.history.undo_stack.clone();
466 assert_eq!(entries.len(), 3);
467
468 buffer.undo_or_redo(entries[0].transaction.clone()).unwrap();
469 assert_eq!(buffer.text(), "1cdef234");
470 buffer.undo_or_redo(entries[0].transaction.clone()).unwrap();
471 assert_eq!(buffer.text(), "1abcdef234");
472
473 buffer.undo_or_redo(entries[1].transaction.clone()).unwrap();
474 assert_eq!(buffer.text(), "1abcdx234");
475 buffer.undo_or_redo(entries[2].transaction.clone()).unwrap();
476 assert_eq!(buffer.text(), "1abx234");
477 buffer.undo_or_redo(entries[1].transaction.clone()).unwrap();
478 assert_eq!(buffer.text(), "1abyzef234");
479 buffer.undo_or_redo(entries[2].transaction.clone()).unwrap();
480 assert_eq!(buffer.text(), "1abcdef234");
481
482 buffer.undo_or_redo(entries[2].transaction.clone()).unwrap();
483 assert_eq!(buffer.text(), "1abyzef234");
484 buffer.undo_or_redo(entries[0].transaction.clone()).unwrap();
485 assert_eq!(buffer.text(), "1yzef234");
486 buffer.undo_or_redo(entries[1].transaction.clone()).unwrap();
487 assert_eq!(buffer.text(), "1234");
488}
489
490#[test]
491fn test_history() {
492 let mut now = Instant::now();
493 let mut buffer = Buffer::new(0, 0, "123456".into());
494
495 buffer.start_transaction_at(now);
496 buffer.edit([(2..4, "cd")]);
497 buffer.end_transaction_at(now);
498 assert_eq!(buffer.text(), "12cd56");
499
500 buffer.start_transaction_at(now);
501 buffer.edit([(4..5, "e")]);
502 buffer.end_transaction_at(now).unwrap();
503 assert_eq!(buffer.text(), "12cde6");
504
505 now += buffer.history.group_interval + Duration::from_millis(1);
506 buffer.start_transaction_at(now);
507 buffer.edit([(0..1, "a")]);
508 buffer.edit([(1..1, "b")]);
509 buffer.end_transaction_at(now).unwrap();
510 assert_eq!(buffer.text(), "ab2cde6");
511
512 // Last transaction happened past the group interval, undo it on its own.
513 buffer.undo();
514 assert_eq!(buffer.text(), "12cde6");
515
516 // First two transactions happened within the group interval, undo them together.
517 buffer.undo();
518 assert_eq!(buffer.text(), "123456");
519
520 // Redo the first two transactions together.
521 buffer.redo();
522 assert_eq!(buffer.text(), "12cde6");
523
524 // Redo the last transaction on its own.
525 buffer.redo();
526 assert_eq!(buffer.text(), "ab2cde6");
527
528 buffer.start_transaction_at(now);
529 assert!(buffer.end_transaction_at(now).is_none());
530 buffer.undo();
531 assert_eq!(buffer.text(), "12cde6");
532
533 // Redo stack gets cleared after performing an edit.
534 buffer.edit([(0..0, "X")]);
535 assert_eq!(buffer.text(), "X12cde6");
536 buffer.redo();
537 assert_eq!(buffer.text(), "X12cde6");
538 buffer.undo();
539 assert_eq!(buffer.text(), "12cde6");
540 buffer.undo();
541 assert_eq!(buffer.text(), "123456");
542}
543
544#[test]
545fn test_finalize_last_transaction() {
546 let now = Instant::now();
547 let mut buffer = Buffer::new(0, 0, "123456".into());
548
549 buffer.start_transaction_at(now);
550 buffer.edit([(2..4, "cd")]);
551 buffer.end_transaction_at(now);
552 assert_eq!(buffer.text(), "12cd56");
553
554 buffer.finalize_last_transaction();
555 buffer.start_transaction_at(now);
556 buffer.edit([(4..5, "e")]);
557 buffer.end_transaction_at(now).unwrap();
558 assert_eq!(buffer.text(), "12cde6");
559
560 buffer.start_transaction_at(now);
561 buffer.edit([(0..1, "a")]);
562 buffer.edit([(1..1, "b")]);
563 buffer.end_transaction_at(now).unwrap();
564 assert_eq!(buffer.text(), "ab2cde6");
565
566 buffer.undo();
567 assert_eq!(buffer.text(), "12cd56");
568
569 buffer.undo();
570 assert_eq!(buffer.text(), "123456");
571
572 buffer.redo();
573 assert_eq!(buffer.text(), "12cd56");
574
575 buffer.redo();
576 assert_eq!(buffer.text(), "ab2cde6");
577}
578
579#[test]
580fn test_edited_ranges_for_transaction() {
581 let now = Instant::now();
582 let mut buffer = Buffer::new(0, 0, "1234567".into());
583
584 buffer.start_transaction_at(now);
585 buffer.edit([(2..4, "cd")]);
586 buffer.edit([(6..6, "efg")]);
587 buffer.end_transaction_at(now);
588 assert_eq!(buffer.text(), "12cd56efg7");
589
590 let tx = buffer.finalize_last_transaction().unwrap().clone();
591 assert_eq!(
592 buffer
593 .edited_ranges_for_transaction::<usize>(&tx)
594 .collect::<Vec<_>>(),
595 [2..4, 6..9]
596 );
597
598 buffer.edit([(5..5, "hijk")]);
599 assert_eq!(buffer.text(), "12cd5hijk6efg7");
600 assert_eq!(
601 buffer
602 .edited_ranges_for_transaction::<usize>(&tx)
603 .collect::<Vec<_>>(),
604 [2..4, 10..13]
605 );
606
607 buffer.edit([(4..4, "l")]);
608 assert_eq!(buffer.text(), "12cdl5hijk6efg7");
609 assert_eq!(
610 buffer
611 .edited_ranges_for_transaction::<usize>(&tx)
612 .collect::<Vec<_>>(),
613 [2..4, 11..14]
614 );
615}
616
617#[test]
618fn test_concurrent_edits() {
619 let text = "abcdef";
620
621 let mut buffer1 = Buffer::new(1, 0, text.into());
622 let mut buffer2 = Buffer::new(2, 0, text.into());
623 let mut buffer3 = Buffer::new(3, 0, text.into());
624
625 let buf1_op = buffer1.edit([(1..2, "12")]);
626 assert_eq!(buffer1.text(), "a12cdef");
627 let buf2_op = buffer2.edit([(3..4, "34")]);
628 assert_eq!(buffer2.text(), "abc34ef");
629 let buf3_op = buffer3.edit([(5..6, "56")]);
630 assert_eq!(buffer3.text(), "abcde56");
631
632 buffer1.apply_op(buf2_op.clone()).unwrap();
633 buffer1.apply_op(buf3_op.clone()).unwrap();
634 buffer2.apply_op(buf1_op.clone()).unwrap();
635 buffer2.apply_op(buf3_op.clone()).unwrap();
636 buffer3.apply_op(buf1_op.clone()).unwrap();
637 buffer3.apply_op(buf2_op.clone()).unwrap();
638
639 assert_eq!(buffer1.text(), "a12c34e56");
640 assert_eq!(buffer2.text(), "a12c34e56");
641 assert_eq!(buffer3.text(), "a12c34e56");
642}
643
644#[gpui::test(iterations = 100)]
645fn test_random_concurrent_edits(mut rng: StdRng) {
646 let peers = env::var("PEERS")
647 .map(|i| i.parse().expect("invalid `PEERS` variable"))
648 .unwrap_or(5);
649 let operations = env::var("OPERATIONS")
650 .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
651 .unwrap_or(10);
652
653 let base_text_len = rng.gen_range(0..10);
654 let base_text = RandomCharIter::new(&mut rng)
655 .take(base_text_len)
656 .collect::<String>();
657 let mut replica_ids = Vec::new();
658 let mut buffers = Vec::new();
659 let mut network = Network::new(rng.clone());
660
661 for i in 0..peers {
662 let mut buffer = Buffer::new(i as ReplicaId, 0, base_text.clone().into());
663 buffer.history.group_interval = Duration::from_millis(rng.gen_range(0..=200));
664 buffers.push(buffer);
665 replica_ids.push(i as u16);
666 network.add_peer(i as u16);
667 }
668
669 log::info!("initial text: {:?}", base_text);
670
671 let mut mutation_count = operations;
672 loop {
673 let replica_index = rng.gen_range(0..peers);
674 let replica_id = replica_ids[replica_index];
675 let buffer = &mut buffers[replica_index];
676 match rng.gen_range(0..=100) {
677 0..=50 if mutation_count != 0 => {
678 let op = buffer.randomly_edit(&mut rng, 5).1;
679 network.broadcast(buffer.replica_id, vec![op]);
680 log::info!("buffer {} text: {:?}", buffer.replica_id, buffer.text());
681 mutation_count -= 1;
682 }
683 51..=70 if mutation_count != 0 => {
684 let ops = buffer.randomly_undo_redo(&mut rng);
685 network.broadcast(buffer.replica_id, ops);
686 mutation_count -= 1;
687 }
688 71..=100 if network.has_unreceived(replica_id) => {
689 let ops = network.receive(replica_id);
690 if !ops.is_empty() {
691 log::info!(
692 "peer {} applying {} ops from the network.",
693 replica_id,
694 ops.len()
695 );
696 buffer.apply_ops(ops).unwrap();
697 }
698 }
699 _ => {}
700 }
701 buffer.check_invariants();
702
703 if mutation_count == 0 && network.is_idle() {
704 break;
705 }
706 }
707
708 let first_buffer = &buffers[0];
709 for buffer in &buffers[1..] {
710 assert_eq!(
711 buffer.text(),
712 first_buffer.text(),
713 "Replica {} text != Replica 0 text",
714 buffer.replica_id
715 );
716 buffer.check_invariants();
717 }
718}