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());
46 LineEnding::normalize(&mut reference_string);
47
48 buffer.history.group_interval = Duration::from_millis(rng.gen_range(0..=200));
49 let mut buffer_versions = Vec::new();
50 log::info!(
51 "buffer text {:?}, version: {:?}",
52 buffer.text(),
53 buffer.version()
54 );
55
56 for _i in 0..operations {
57 let (edits, _) = buffer.randomly_edit(&mut rng, 5);
58 for (old_range, new_text) in edits.iter().rev() {
59 reference_string.replace_range(old_range.clone(), new_text);
60 }
61
62 assert_eq!(buffer.text(), reference_string);
63 log::info!(
64 "buffer text {:?}, version: {:?}",
65 buffer.text(),
66 buffer.version()
67 );
68
69 if rng.gen_bool(0.25) {
70 buffer.randomly_undo_redo(&mut rng);
71 reference_string = buffer.text();
72 log::info!(
73 "buffer text {:?}, version: {:?}",
74 buffer.text(),
75 buffer.version()
76 );
77 }
78
79 let range = buffer.random_byte_range(0, &mut rng);
80 assert_eq!(
81 buffer.text_summary_for_range::<TextSummary, _>(range.clone()),
82 TextSummary::from(&reference_string[range])
83 );
84
85 buffer.check_invariants();
86
87 if rng.gen_bool(0.3) {
88 buffer_versions.push((buffer.clone(), buffer.subscribe()));
89 }
90 }
91
92 for (old_buffer, subscription) in buffer_versions {
93 let edits = buffer
94 .edits_since::<usize>(&old_buffer.version)
95 .collect::<Vec<_>>();
96
97 log::info!(
98 "applying edits since version {:?} to old text: {:?}: {:?}",
99 old_buffer.version(),
100 old_buffer.text(),
101 edits,
102 );
103
104 let mut text = old_buffer.visible_text.clone();
105 for edit in edits {
106 let new_text: String = buffer.text_for_range(edit.new.clone()).collect();
107 text.replace(edit.new.start..edit.new.start + edit.old.len(), &new_text);
108 }
109 assert_eq!(text.to_string(), buffer.text());
110
111 for _ in 0..5 {
112 let end_ix = old_buffer.clip_offset(rng.gen_range(0..=old_buffer.len()), Bias::Right);
113 let start_ix = old_buffer.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
114 let range = old_buffer.anchor_before(start_ix)..old_buffer.anchor_after(end_ix);
115 let mut old_text = old_buffer.text_for_range(range.clone()).collect::<String>();
116 let edits = buffer
117 .edits_since_in_range::<usize>(&old_buffer.version, range.clone())
118 .collect::<Vec<_>>();
119 log::info!(
120 "applying edits since version {:?} to old text in range {:?}: {:?}: {:?}",
121 old_buffer.version(),
122 start_ix..end_ix,
123 old_text,
124 edits,
125 );
126
127 let new_text = buffer.text_for_range(range).collect::<String>();
128 for edit in edits {
129 old_text.replace_range(
130 edit.new.start..edit.new.start + edit.old_len(),
131 &new_text[edit.new],
132 );
133 }
134 assert_eq!(old_text, new_text);
135 }
136
137 let subscription_edits = subscription.consume();
138 log::info!(
139 "applying subscription edits since version {:?} to old text: {:?}: {:?}",
140 old_buffer.version(),
141 old_buffer.text(),
142 subscription_edits,
143 );
144
145 let mut text = old_buffer.visible_text.clone();
146 for edit in subscription_edits.into_inner() {
147 let new_text: String = buffer.text_for_range(edit.new.clone()).collect();
148 text.replace(edit.new.start..edit.new.start + edit.old.len(), &new_text);
149 }
150 assert_eq!(text.to_string(), buffer.text());
151 }
152}
153
154#[test]
155fn test_line_endings() {
156 assert_eq!(LineEnding::detect(&"🍐✅\n".repeat(1000)), LineEnding::Unix);
157 assert_eq!(LineEnding::detect(&"abcd\n".repeat(1000)), LineEnding::Unix);
158 assert_eq!(
159 LineEnding::detect(&"🍐✅\r\n".repeat(1000)),
160 LineEnding::Windows
161 );
162 assert_eq!(
163 LineEnding::detect(&"abcd\r\n".repeat(1000)),
164 LineEnding::Windows
165 );
166
167 let mut buffer = Buffer::new(0, 0, "one\r\ntwo\rthree".into());
168 assert_eq!(buffer.text(), "one\ntwo\nthree");
169 assert_eq!(buffer.line_ending(), LineEnding::Windows);
170 buffer.check_invariants();
171
172 buffer.edit([(buffer.len()..buffer.len(), "\r\nfour")]);
173 buffer.edit([(0..0, "zero\r\n")]);
174 assert_eq!(buffer.text(), "zero\none\ntwo\nthree\nfour");
175 assert_eq!(buffer.line_ending(), LineEnding::Windows);
176 buffer.check_invariants();
177}
178
179#[test]
180fn test_line_len() {
181 let mut buffer = Buffer::new(0, 0, "".into());
182 buffer.edit([(0..0, "abcd\nefg\nhij")]);
183 buffer.edit([(12..12, "kl\nmno")]);
184 buffer.edit([(18..18, "\npqrs\n")]);
185 buffer.edit([(18..21, "\nPQ")]);
186
187 assert_eq!(buffer.line_len(0), 4);
188 assert_eq!(buffer.line_len(1), 3);
189 assert_eq!(buffer.line_len(2), 5);
190 assert_eq!(buffer.line_len(3), 3);
191 assert_eq!(buffer.line_len(4), 4);
192 assert_eq!(buffer.line_len(5), 0);
193}
194
195#[test]
196fn test_common_prefix_at_positionn() {
197 let text = "a = str; b = δα";
198 let buffer = Buffer::new(0, 0, text.into());
199
200 let offset1 = offset_after(text, "str");
201 let offset2 = offset_after(text, "δα");
202
203 // the preceding word is a prefix of the suggestion
204 assert_eq!(
205 buffer.common_prefix_at(offset1, "string"),
206 range_of(text, "str"),
207 );
208 // a suffix of the preceding word is a prefix of the suggestion
209 assert_eq!(
210 buffer.common_prefix_at(offset1, "tree"),
211 range_of(text, "tr"),
212 );
213 // the preceding word is a substring of the suggestion, but not a prefix
214 assert_eq!(
215 buffer.common_prefix_at(offset1, "astro"),
216 empty_range_after(text, "str"),
217 );
218
219 // prefix matching is case insenstive.
220 assert_eq!(
221 buffer.common_prefix_at(offset1, "Strαngε"),
222 range_of(text, "str"),
223 );
224 assert_eq!(
225 buffer.common_prefix_at(offset2, "ΔΑΜΝ"),
226 range_of(text, "δα"),
227 );
228
229 fn offset_after(text: &str, part: &str) -> usize {
230 text.find(part).unwrap() + part.len()
231 }
232
233 fn empty_range_after(text: &str, part: &str) -> Range<usize> {
234 let offset = offset_after(text, part);
235 offset..offset
236 }
237
238 fn range_of(text: &str, part: &str) -> Range<usize> {
239 let start = text.find(part).unwrap();
240 start..start + part.len()
241 }
242}
243
244#[test]
245fn test_text_summary_for_range() {
246 let buffer = Buffer::new(0, 0, "ab\nefg\nhklm\nnopqrs\ntuvwxyz".into());
247 assert_eq!(
248 buffer.text_summary_for_range::<TextSummary, _>(1..3),
249 TextSummary {
250 len: 2,
251 len_utf16: OffsetUtf16(2),
252 lines: Point::new(1, 0),
253 first_line_chars: 1,
254 last_line_chars: 0,
255 last_line_len_utf16: 0,
256 longest_row: 0,
257 longest_row_chars: 1,
258 }
259 );
260 assert_eq!(
261 buffer.text_summary_for_range::<TextSummary, _>(1..12),
262 TextSummary {
263 len: 11,
264 len_utf16: OffsetUtf16(11),
265 lines: Point::new(3, 0),
266 first_line_chars: 1,
267 last_line_chars: 0,
268 last_line_len_utf16: 0,
269 longest_row: 2,
270 longest_row_chars: 4,
271 }
272 );
273 assert_eq!(
274 buffer.text_summary_for_range::<TextSummary, _>(0..20),
275 TextSummary {
276 len: 20,
277 len_utf16: OffsetUtf16(20),
278 lines: Point::new(4, 1),
279 first_line_chars: 2,
280 last_line_chars: 1,
281 last_line_len_utf16: 1,
282 longest_row: 3,
283 longest_row_chars: 6,
284 }
285 );
286 assert_eq!(
287 buffer.text_summary_for_range::<TextSummary, _>(0..22),
288 TextSummary {
289 len: 22,
290 len_utf16: OffsetUtf16(22),
291 lines: Point::new(4, 3),
292 first_line_chars: 2,
293 last_line_chars: 3,
294 last_line_len_utf16: 3,
295 longest_row: 3,
296 longest_row_chars: 6,
297 }
298 );
299 assert_eq!(
300 buffer.text_summary_for_range::<TextSummary, _>(7..22),
301 TextSummary {
302 len: 15,
303 len_utf16: OffsetUtf16(15),
304 lines: Point::new(2, 3),
305 first_line_chars: 4,
306 last_line_chars: 3,
307 last_line_len_utf16: 3,
308 longest_row: 1,
309 longest_row_chars: 6,
310 }
311 );
312}
313
314#[test]
315fn test_chars_at() {
316 let mut buffer = Buffer::new(0, 0, "".into());
317 buffer.edit([(0..0, "abcd\nefgh\nij")]);
318 buffer.edit([(12..12, "kl\nmno")]);
319 buffer.edit([(18..18, "\npqrs")]);
320 buffer.edit([(18..21, "\nPQ")]);
321
322 let chars = buffer.chars_at(Point::new(0, 0));
323 assert_eq!(chars.collect::<String>(), "abcd\nefgh\nijkl\nmno\nPQrs");
324
325 let chars = buffer.chars_at(Point::new(1, 0));
326 assert_eq!(chars.collect::<String>(), "efgh\nijkl\nmno\nPQrs");
327
328 let chars = buffer.chars_at(Point::new(2, 0));
329 assert_eq!(chars.collect::<String>(), "ijkl\nmno\nPQrs");
330
331 let chars = buffer.chars_at(Point::new(3, 0));
332 assert_eq!(chars.collect::<String>(), "mno\nPQrs");
333
334 let chars = buffer.chars_at(Point::new(4, 0));
335 assert_eq!(chars.collect::<String>(), "PQrs");
336
337 // Regression test:
338 let mut buffer = Buffer::new(0, 0, "".into());
339 buffer.edit([(0..0, "[workspace]\nmembers = [\n \"xray_core\",\n \"xray_server\",\n \"xray_cli\",\n \"xray_wasm\",\n]\n")]);
340 buffer.edit([(60..60, "\n")]);
341
342 let chars = buffer.chars_at(Point::new(6, 0));
343 assert_eq!(chars.collect::<String>(), " \"xray_wasm\",\n]\n");
344}
345
346#[test]
347fn test_anchors() {
348 let mut buffer = Buffer::new(0, 0, "".into());
349 buffer.edit([(0..0, "abc")]);
350 let left_anchor = buffer.anchor_before(2);
351 let right_anchor = buffer.anchor_after(2);
352
353 buffer.edit([(1..1, "def\n")]);
354 assert_eq!(buffer.text(), "adef\nbc");
355 assert_eq!(left_anchor.to_offset(&buffer), 6);
356 assert_eq!(right_anchor.to_offset(&buffer), 6);
357 assert_eq!(left_anchor.to_point(&buffer), Point { row: 1, column: 1 });
358 assert_eq!(right_anchor.to_point(&buffer), Point { row: 1, column: 1 });
359
360 buffer.edit([(2..3, "")]);
361 assert_eq!(buffer.text(), "adf\nbc");
362 assert_eq!(left_anchor.to_offset(&buffer), 5);
363 assert_eq!(right_anchor.to_offset(&buffer), 5);
364 assert_eq!(left_anchor.to_point(&buffer), Point { row: 1, column: 1 });
365 assert_eq!(right_anchor.to_point(&buffer), Point { row: 1, column: 1 });
366
367 buffer.edit([(5..5, "ghi\n")]);
368 assert_eq!(buffer.text(), "adf\nbghi\nc");
369 assert_eq!(left_anchor.to_offset(&buffer), 5);
370 assert_eq!(right_anchor.to_offset(&buffer), 9);
371 assert_eq!(left_anchor.to_point(&buffer), Point { row: 1, column: 1 });
372 assert_eq!(right_anchor.to_point(&buffer), Point { row: 2, column: 0 });
373
374 buffer.edit([(7..9, "")]);
375 assert_eq!(buffer.text(), "adf\nbghc");
376 assert_eq!(left_anchor.to_offset(&buffer), 5);
377 assert_eq!(right_anchor.to_offset(&buffer), 7);
378 assert_eq!(left_anchor.to_point(&buffer), Point { row: 1, column: 1 },);
379 assert_eq!(right_anchor.to_point(&buffer), Point { row: 1, column: 3 });
380
381 // Ensure anchoring to a point is equivalent to anchoring to an offset.
382 assert_eq!(
383 buffer.anchor_before(Point { row: 0, column: 0 }),
384 buffer.anchor_before(0)
385 );
386 assert_eq!(
387 buffer.anchor_before(Point { row: 0, column: 1 }),
388 buffer.anchor_before(1)
389 );
390 assert_eq!(
391 buffer.anchor_before(Point { row: 0, column: 2 }),
392 buffer.anchor_before(2)
393 );
394 assert_eq!(
395 buffer.anchor_before(Point { row: 0, column: 3 }),
396 buffer.anchor_before(3)
397 );
398 assert_eq!(
399 buffer.anchor_before(Point { row: 1, column: 0 }),
400 buffer.anchor_before(4)
401 );
402 assert_eq!(
403 buffer.anchor_before(Point { row: 1, column: 1 }),
404 buffer.anchor_before(5)
405 );
406 assert_eq!(
407 buffer.anchor_before(Point { row: 1, column: 2 }),
408 buffer.anchor_before(6)
409 );
410 assert_eq!(
411 buffer.anchor_before(Point { row: 1, column: 3 }),
412 buffer.anchor_before(7)
413 );
414 assert_eq!(
415 buffer.anchor_before(Point { row: 1, column: 4 }),
416 buffer.anchor_before(8)
417 );
418
419 // Comparison between anchors.
420 let anchor_at_offset_0 = buffer.anchor_before(0);
421 let anchor_at_offset_1 = buffer.anchor_before(1);
422 let anchor_at_offset_2 = buffer.anchor_before(2);
423
424 assert_eq!(
425 anchor_at_offset_0.cmp(&anchor_at_offset_0, &buffer),
426 Ordering::Equal
427 );
428 assert_eq!(
429 anchor_at_offset_1.cmp(&anchor_at_offset_1, &buffer),
430 Ordering::Equal
431 );
432 assert_eq!(
433 anchor_at_offset_2.cmp(&anchor_at_offset_2, &buffer),
434 Ordering::Equal
435 );
436
437 assert_eq!(
438 anchor_at_offset_0.cmp(&anchor_at_offset_1, &buffer),
439 Ordering::Less
440 );
441 assert_eq!(
442 anchor_at_offset_1.cmp(&anchor_at_offset_2, &buffer),
443 Ordering::Less
444 );
445 assert_eq!(
446 anchor_at_offset_0.cmp(&anchor_at_offset_2, &buffer),
447 Ordering::Less
448 );
449
450 assert_eq!(
451 anchor_at_offset_1.cmp(&anchor_at_offset_0, &buffer),
452 Ordering::Greater
453 );
454 assert_eq!(
455 anchor_at_offset_2.cmp(&anchor_at_offset_1, &buffer),
456 Ordering::Greater
457 );
458 assert_eq!(
459 anchor_at_offset_2.cmp(&anchor_at_offset_0, &buffer),
460 Ordering::Greater
461 );
462}
463
464#[test]
465fn test_anchors_at_start_and_end() {
466 let mut buffer = Buffer::new(0, 0, "".into());
467 let before_start_anchor = buffer.anchor_before(0);
468 let after_end_anchor = buffer.anchor_after(0);
469
470 buffer.edit([(0..0, "abc")]);
471 assert_eq!(buffer.text(), "abc");
472 assert_eq!(before_start_anchor.to_offset(&buffer), 0);
473 assert_eq!(after_end_anchor.to_offset(&buffer), 3);
474
475 let after_start_anchor = buffer.anchor_after(0);
476 let before_end_anchor = buffer.anchor_before(3);
477
478 buffer.edit([(3..3, "def")]);
479 buffer.edit([(0..0, "ghi")]);
480 assert_eq!(buffer.text(), "ghiabcdef");
481 assert_eq!(before_start_anchor.to_offset(&buffer), 0);
482 assert_eq!(after_start_anchor.to_offset(&buffer), 3);
483 assert_eq!(before_end_anchor.to_offset(&buffer), 6);
484 assert_eq!(after_end_anchor.to_offset(&buffer), 9);
485}
486
487#[test]
488fn test_undo_redo() {
489 let mut buffer = Buffer::new(0, 0, "1234".into());
490 // Set group interval to zero so as to not group edits in the undo stack.
491 buffer.history.group_interval = Duration::from_secs(0);
492
493 buffer.edit([(1..1, "abx")]);
494 buffer.edit([(3..4, "yzef")]);
495 buffer.edit([(3..5, "cd")]);
496 assert_eq!(buffer.text(), "1abcdef234");
497
498 let entries = buffer.history.undo_stack.clone();
499 assert_eq!(entries.len(), 3);
500
501 buffer.undo_or_redo(entries[0].transaction.clone()).unwrap();
502 assert_eq!(buffer.text(), "1cdef234");
503 buffer.undo_or_redo(entries[0].transaction.clone()).unwrap();
504 assert_eq!(buffer.text(), "1abcdef234");
505
506 buffer.undo_or_redo(entries[1].transaction.clone()).unwrap();
507 assert_eq!(buffer.text(), "1abcdx234");
508 buffer.undo_or_redo(entries[2].transaction.clone()).unwrap();
509 assert_eq!(buffer.text(), "1abx234");
510 buffer.undo_or_redo(entries[1].transaction.clone()).unwrap();
511 assert_eq!(buffer.text(), "1abyzef234");
512 buffer.undo_or_redo(entries[2].transaction.clone()).unwrap();
513 assert_eq!(buffer.text(), "1abcdef234");
514
515 buffer.undo_or_redo(entries[2].transaction.clone()).unwrap();
516 assert_eq!(buffer.text(), "1abyzef234");
517 buffer.undo_or_redo(entries[0].transaction.clone()).unwrap();
518 assert_eq!(buffer.text(), "1yzef234");
519 buffer.undo_or_redo(entries[1].transaction.clone()).unwrap();
520 assert_eq!(buffer.text(), "1234");
521}
522
523#[test]
524fn test_history() {
525 let mut now = Instant::now();
526 let mut buffer = Buffer::new(0, 0, "123456".into());
527
528 let transaction_1 = buffer.start_transaction_at(now).unwrap();
529 buffer.edit([(2..4, "cd")]);
530 buffer.end_transaction_at(now);
531 assert_eq!(buffer.text(), "12cd56");
532
533 buffer.start_transaction_at(now);
534 buffer.edit([(4..5, "e")]);
535 buffer.end_transaction_at(now).unwrap();
536 assert_eq!(buffer.text(), "12cde6");
537
538 now += buffer.history.group_interval + Duration::from_millis(1);
539 buffer.start_transaction_at(now);
540 buffer.edit([(0..1, "a")]);
541 buffer.edit([(1..1, "b")]);
542 buffer.end_transaction_at(now).unwrap();
543 assert_eq!(buffer.text(), "ab2cde6");
544
545 // Last transaction happened past the group interval, undo it on its own.
546 buffer.undo();
547 assert_eq!(buffer.text(), "12cde6");
548
549 // First two transactions happened within the group interval, undo them together.
550 buffer.undo();
551 assert_eq!(buffer.text(), "123456");
552
553 // Redo the first two transactions together.
554 buffer.redo();
555 assert_eq!(buffer.text(), "12cde6");
556
557 // Redo the last transaction on its own.
558 buffer.redo();
559 assert_eq!(buffer.text(), "ab2cde6");
560
561 buffer.start_transaction_at(now);
562 assert!(buffer.end_transaction_at(now).is_none());
563 buffer.undo();
564 assert_eq!(buffer.text(), "12cde6");
565
566 // Redo stack gets cleared after performing an edit.
567 buffer.start_transaction_at(now);
568 buffer.edit([(0..0, "X")]);
569 buffer.end_transaction_at(now);
570 assert_eq!(buffer.text(), "X12cde6");
571 buffer.redo();
572 assert_eq!(buffer.text(), "X12cde6");
573 buffer.undo();
574 assert_eq!(buffer.text(), "12cde6");
575 buffer.undo();
576 assert_eq!(buffer.text(), "123456");
577
578 // Transactions can be grouped manually.
579 buffer.redo();
580 buffer.redo();
581 assert_eq!(buffer.text(), "X12cde6");
582 buffer.group_until_transaction(transaction_1);
583 buffer.undo();
584 assert_eq!(buffer.text(), "123456");
585 buffer.redo();
586 assert_eq!(buffer.text(), "X12cde6");
587}
588
589#[test]
590fn test_finalize_last_transaction() {
591 let now = Instant::now();
592 let mut buffer = Buffer::new(0, 0, "123456".into());
593
594 buffer.start_transaction_at(now);
595 buffer.edit([(2..4, "cd")]);
596 buffer.end_transaction_at(now);
597 assert_eq!(buffer.text(), "12cd56");
598
599 buffer.finalize_last_transaction();
600 buffer.start_transaction_at(now);
601 buffer.edit([(4..5, "e")]);
602 buffer.end_transaction_at(now).unwrap();
603 assert_eq!(buffer.text(), "12cde6");
604
605 buffer.start_transaction_at(now);
606 buffer.edit([(0..1, "a")]);
607 buffer.edit([(1..1, "b")]);
608 buffer.end_transaction_at(now).unwrap();
609 assert_eq!(buffer.text(), "ab2cde6");
610
611 buffer.undo();
612 assert_eq!(buffer.text(), "12cd56");
613
614 buffer.undo();
615 assert_eq!(buffer.text(), "123456");
616
617 buffer.redo();
618 assert_eq!(buffer.text(), "12cd56");
619
620 buffer.redo();
621 assert_eq!(buffer.text(), "ab2cde6");
622}
623
624#[test]
625fn test_edited_ranges_for_transaction() {
626 let now = Instant::now();
627 let mut buffer = Buffer::new(0, 0, "1234567".into());
628
629 buffer.start_transaction_at(now);
630 buffer.edit([(2..4, "cd")]);
631 buffer.edit([(6..6, "efg")]);
632 buffer.end_transaction_at(now);
633 assert_eq!(buffer.text(), "12cd56efg7");
634
635 let tx = buffer.finalize_last_transaction().unwrap().clone();
636 assert_eq!(
637 buffer
638 .edited_ranges_for_transaction::<usize>(&tx)
639 .collect::<Vec<_>>(),
640 [2..4, 6..9]
641 );
642
643 buffer.edit([(5..5, "hijk")]);
644 assert_eq!(buffer.text(), "12cd5hijk6efg7");
645 assert_eq!(
646 buffer
647 .edited_ranges_for_transaction::<usize>(&tx)
648 .collect::<Vec<_>>(),
649 [2..4, 10..13]
650 );
651
652 buffer.edit([(4..4, "l")]);
653 assert_eq!(buffer.text(), "12cdl5hijk6efg7");
654 assert_eq!(
655 buffer
656 .edited_ranges_for_transaction::<usize>(&tx)
657 .collect::<Vec<_>>(),
658 [2..4, 11..14]
659 );
660}
661
662#[test]
663fn test_concurrent_edits() {
664 let text = "abcdef";
665
666 let mut buffer1 = Buffer::new(1, 0, text.into());
667 let mut buffer2 = Buffer::new(2, 0, text.into());
668 let mut buffer3 = Buffer::new(3, 0, text.into());
669
670 let buf1_op = buffer1.edit([(1..2, "12")]);
671 assert_eq!(buffer1.text(), "a12cdef");
672 let buf2_op = buffer2.edit([(3..4, "34")]);
673 assert_eq!(buffer2.text(), "abc34ef");
674 let buf3_op = buffer3.edit([(5..6, "56")]);
675 assert_eq!(buffer3.text(), "abcde56");
676
677 buffer1.apply_op(buf2_op.clone()).unwrap();
678 buffer1.apply_op(buf3_op.clone()).unwrap();
679 buffer2.apply_op(buf1_op.clone()).unwrap();
680 buffer2.apply_op(buf3_op).unwrap();
681 buffer3.apply_op(buf1_op).unwrap();
682 buffer3.apply_op(buf2_op).unwrap();
683
684 assert_eq!(buffer1.text(), "a12c34e56");
685 assert_eq!(buffer2.text(), "a12c34e56");
686 assert_eq!(buffer3.text(), "a12c34e56");
687}
688
689#[gpui::test(iterations = 100)]
690fn test_random_concurrent_edits(mut rng: StdRng) {
691 let peers = env::var("PEERS")
692 .map(|i| i.parse().expect("invalid `PEERS` variable"))
693 .unwrap_or(5);
694 let operations = env::var("OPERATIONS")
695 .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
696 .unwrap_or(10);
697
698 let base_text_len = rng.gen_range(0..10);
699 let base_text = RandomCharIter::new(&mut rng)
700 .take(base_text_len)
701 .collect::<String>();
702 let mut replica_ids = Vec::new();
703 let mut buffers = Vec::new();
704 let mut network = Network::new(rng.clone());
705
706 for i in 0..peers {
707 let mut buffer = Buffer::new(i as ReplicaId, 0, base_text.clone());
708 buffer.history.group_interval = Duration::from_millis(rng.gen_range(0..=200));
709 buffers.push(buffer);
710 replica_ids.push(i as u16);
711 network.add_peer(i as u16);
712 }
713
714 log::info!("initial text: {:?}", base_text);
715
716 let mut mutation_count = operations;
717 loop {
718 let replica_index = rng.gen_range(0..peers);
719 let replica_id = replica_ids[replica_index];
720 let buffer = &mut buffers[replica_index];
721 match rng.gen_range(0..=100) {
722 0..=50 if mutation_count != 0 => {
723 let op = buffer.randomly_edit(&mut rng, 5).1;
724 network.broadcast(buffer.replica_id, vec![op]);
725 log::info!("buffer {} text: {:?}", buffer.replica_id, buffer.text());
726 mutation_count -= 1;
727 }
728 51..=70 if mutation_count != 0 => {
729 let ops = buffer.randomly_undo_redo(&mut rng);
730 network.broadcast(buffer.replica_id, ops);
731 mutation_count -= 1;
732 }
733 71..=100 if network.has_unreceived(replica_id) => {
734 let ops = network.receive(replica_id);
735 if !ops.is_empty() {
736 log::info!(
737 "peer {} applying {} ops from the network.",
738 replica_id,
739 ops.len()
740 );
741 buffer.apply_ops(ops).unwrap();
742 }
743 }
744 _ => {}
745 }
746 buffer.check_invariants();
747
748 if mutation_count == 0 && network.is_idle() {
749 break;
750 }
751 }
752
753 let first_buffer = &buffers[0];
754 for buffer in &buffers[1..] {
755 assert_eq!(
756 buffer.text(),
757 first_buffer.text(),
758 "Replica {} text != Replica 0 text",
759 buffer.replica_id
760 );
761 buffer.check_invariants();
762 }
763}