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, History::new("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, History::new(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, History::new("".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, History::new(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, History::new("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, History::new("".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, History::new("".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, History::new("".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, History::new("".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, History::new("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, History::new("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
534#[test]
535fn test_finalize_last_transaction() {
536 let now = Instant::now();
537 let mut buffer = Buffer::new(0, 0, History::new("123456".into()));
538
539 buffer.start_transaction_at(now);
540 buffer.edit([(2..4, "cd")]);
541 buffer.end_transaction_at(now);
542 assert_eq!(buffer.text(), "12cd56");
543
544 buffer.finalize_last_transaction();
545 buffer.start_transaction_at(now);
546 buffer.edit([(4..5, "e")]);
547 buffer.end_transaction_at(now).unwrap();
548 assert_eq!(buffer.text(), "12cde6");
549
550 buffer.start_transaction_at(now);
551 buffer.edit([(0..1, "a")]);
552 buffer.edit([(1..1, "b")]);
553 buffer.end_transaction_at(now).unwrap();
554 assert_eq!(buffer.text(), "ab2cde6");
555
556 buffer.undo();
557 assert_eq!(buffer.text(), "12cd56");
558
559 buffer.undo();
560 assert_eq!(buffer.text(), "123456");
561
562 buffer.redo();
563 assert_eq!(buffer.text(), "12cd56");
564
565 buffer.redo();
566 assert_eq!(buffer.text(), "ab2cde6");
567}
568
569#[test]
570fn test_edited_ranges_for_transaction() {
571 let now = Instant::now();
572 let mut buffer = Buffer::new(0, 0, History::new("1234567".into()));
573
574 buffer.start_transaction_at(now);
575 buffer.edit([(2..4, "cd")]);
576 buffer.edit([(6..6, "efg")]);
577 buffer.end_transaction_at(now);
578 assert_eq!(buffer.text(), "12cd56efg7");
579
580 let tx = buffer.finalize_last_transaction().unwrap().clone();
581 assert_eq!(
582 buffer
583 .edited_ranges_for_transaction::<usize>(&tx)
584 .collect::<Vec<_>>(),
585 [2..4, 6..9]
586 );
587
588 buffer.edit([(5..5, "hijk")]);
589 assert_eq!(buffer.text(), "12cd5hijk6efg7");
590 assert_eq!(
591 buffer
592 .edited_ranges_for_transaction::<usize>(&tx)
593 .collect::<Vec<_>>(),
594 [2..4, 10..13]
595 );
596
597 buffer.edit([(4..4, "l")]);
598 assert_eq!(buffer.text(), "12cdl5hijk6efg7");
599 assert_eq!(
600 buffer
601 .edited_ranges_for_transaction::<usize>(&tx)
602 .collect::<Vec<_>>(),
603 [2..4, 11..14]
604 );
605}
606
607#[test]
608fn test_concurrent_edits() {
609 let text = "abcdef";
610
611 let mut buffer1 = Buffer::new(1, 0, History::new(text.into()));
612 let mut buffer2 = Buffer::new(2, 0, History::new(text.into()));
613 let mut buffer3 = Buffer::new(3, 0, History::new(text.into()));
614
615 let buf1_op = buffer1.edit([(1..2, "12")]);
616 assert_eq!(buffer1.text(), "a12cdef");
617 let buf2_op = buffer2.edit([(3..4, "34")]);
618 assert_eq!(buffer2.text(), "abc34ef");
619 let buf3_op = buffer3.edit([(5..6, "56")]);
620 assert_eq!(buffer3.text(), "abcde56");
621
622 buffer1.apply_op(buf2_op.clone()).unwrap();
623 buffer1.apply_op(buf3_op.clone()).unwrap();
624 buffer2.apply_op(buf1_op.clone()).unwrap();
625 buffer2.apply_op(buf3_op.clone()).unwrap();
626 buffer3.apply_op(buf1_op.clone()).unwrap();
627 buffer3.apply_op(buf2_op.clone()).unwrap();
628
629 assert_eq!(buffer1.text(), "a12c34e56");
630 assert_eq!(buffer2.text(), "a12c34e56");
631 assert_eq!(buffer3.text(), "a12c34e56");
632}
633
634#[gpui::test(iterations = 100)]
635fn test_random_concurrent_edits(mut rng: StdRng) {
636 let peers = env::var("PEERS")
637 .map(|i| i.parse().expect("invalid `PEERS` variable"))
638 .unwrap_or(5);
639 let operations = env::var("OPERATIONS")
640 .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
641 .unwrap_or(10);
642
643 let base_text_len = rng.gen_range(0..10);
644 let base_text = RandomCharIter::new(&mut rng)
645 .take(base_text_len)
646 .collect::<String>();
647 let mut replica_ids = Vec::new();
648 let mut buffers = Vec::new();
649 let mut network = Network::new(rng.clone());
650
651 for i in 0..peers {
652 let mut buffer = Buffer::new(i as ReplicaId, 0, History::new(base_text.clone().into()));
653 buffer.history.group_interval = Duration::from_millis(rng.gen_range(0..=200));
654 buffers.push(buffer);
655 replica_ids.push(i as u16);
656 network.add_peer(i as u16);
657 }
658
659 log::info!("initial text: {:?}", base_text);
660
661 let mut mutation_count = operations;
662 loop {
663 let replica_index = rng.gen_range(0..peers);
664 let replica_id = replica_ids[replica_index];
665 let buffer = &mut buffers[replica_index];
666 match rng.gen_range(0..=100) {
667 0..=50 if mutation_count != 0 => {
668 let op = buffer.randomly_edit(&mut rng, 5).1;
669 network.broadcast(buffer.replica_id, vec![op]);
670 log::info!("buffer {} text: {:?}", buffer.replica_id, buffer.text());
671 mutation_count -= 1;
672 }
673 51..=70 if mutation_count != 0 => {
674 let ops = buffer.randomly_undo_redo(&mut rng);
675 network.broadcast(buffer.replica_id, ops);
676 mutation_count -= 1;
677 }
678 71..=100 if network.has_unreceived(replica_id) => {
679 let ops = network.receive(replica_id);
680 if !ops.is_empty() {
681 log::info!(
682 "peer {} applying {} ops from the network.",
683 replica_id,
684 ops.len()
685 );
686 buffer.apply_ops(ops).unwrap();
687 }
688 }
689 _ => {}
690 }
691 buffer.check_invariants();
692
693 if mutation_count == 0 && network.is_idle() {
694 break;
695 }
696 }
697
698 let first_buffer = &buffers[0];
699 for buffer in &buffers[1..] {
700 assert_eq!(
701 buffer.text(),
702 first_buffer.text(),
703 "Replica {} text != Replica 0 text",
704 buffer.replica_id
705 );
706 buffer.check_invariants();
707 }
708}