cargo_test_support/
compare.rs

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
//! Routines for comparing and diffing output.
//!
//! # Deprecated comparisons
//!
//! Cargo's tests are in transition from internal-only pattern and normalization routines used in
//! asserts like [`crate::Execs::with_stdout_contains`] to [`assert_e2e`] and [`assert_ui`].
//!
//! ## Patterns
//!
//! Many of these functions support special markup to assist with comparing
//! text that may vary or is otherwise uninteresting for the test at hand. The
//! supported patterns are:
//!
//! - `[..]` is a wildcard that matches 0 or more characters on the same line
//!   (similar to `.*` in a regex). It is non-greedy.
//! - `[EXE]` optionally adds `.exe` on Windows (empty string on other
//!   platforms).
//! - `[ROOT]` is the path to the test directory's root.
//! - `[CWD]` is the working directory of the process that was run.
//! - There is a wide range of substitutions (such as `[COMPILING]` or
//!   `[WARNING]`) to match cargo's "status" output and allows you to ignore
//!   the alignment. See the source of `substitute_macros` for a complete list
//!   of substitutions.
//! - `[DIRTY-MSVC]` (only when the line starts with it) would be replaced by
//!   `[DIRTY]` when `cfg(target_env = "msvc")` or the line will be ignored otherwise.
//!   Tests that work around [issue 7358](https://github.com/rust-lang/cargo/issues/7358)
//!   can use this to avoid duplicating the `with_stderr` call like:
//!   `if cfg!(target_env = "msvc") {e.with_stderr("...[DIRTY]...");} else {e.with_stderr("...");}`.
//!
//! ## Normalization
//!
//! In addition to the patterns described above, the strings are normalized
//! in such a way to avoid unwanted differences. The normalizations are:
//!
//! - Raw tab characters are converted to the string `<tab>`. This is helpful
//!   so that raw tabs do not need to be written in the expected string, and
//!   to avoid confusion of tabs vs spaces.
//! - Backslashes are converted to forward slashes to deal with Windows paths.
//!   This helps so that all tests can be written assuming forward slashes.
//!   Other heuristics are applied to try to ensure Windows-style paths aren't
//!   a problem.
//! - Carriage returns are removed, which can help when running on Windows.

use crate::cross_compile::try_alternate;
use crate::paths;
use crate::{diff, rustc_host};
use anyhow::{bail, Result};
use snapbox::Data;
use snapbox::IntoData;
use std::fmt;
use std::path::Path;
use std::path::PathBuf;
use std::str;
use url::Url;

/// This makes it easier to write regex replacements that are guaranteed to only
/// get compiled once
macro_rules! regex {
    ($re:literal $(,)?) => {{
        static RE: std::sync::OnceLock<regex::Regex> = std::sync::OnceLock::new();
        RE.get_or_init(|| regex::Regex::new($re).unwrap())
    }};
}

/// Assertion policy for UI tests
///
/// This emphasizes showing as much content as possible at the cost of more brittleness
///
/// # Snapshots
///
/// Updating of snapshots is controlled with the `SNAPSHOTS` environment variable:
///
/// - `skip`: do not run the tests
/// - `ignore`: run the tests but ignore their failure
/// - `verify`: run the tests
/// - `overwrite`: update the snapshots based on the output of the tests
///
/// # Patterns
///
/// - `[..]` is a character wildcard, stopping at line breaks
/// - `\n...\n` is a multi-line wildcard
/// - `[EXE]` matches the exe suffix for the current platform
/// - `[ROOT]` matches [`paths::root()`][crate::paths::root]
/// - `[ROOTURL]` matches [`paths::root()`][crate::paths::root] as a URL
///
/// # Normalization
///
/// In addition to the patterns described above, text is normalized
/// in such a way to avoid unwanted differences. The normalizations are:
///
/// - Backslashes are converted to forward slashes to deal with Windows paths.
///   This helps so that all tests can be written assuming forward slashes.
///   Other heuristics are applied to try to ensure Windows-style paths aren't
///   a problem.
/// - Carriage returns are removed, which can help when running on Windows.
///
/// # Example
///
/// ```no_run
/// # use cargo_test_support::compare::assert_e2e;
/// # use cargo_test_support::file;
/// # let p = cargo_test_support::project().build();
/// # let stdout = "";
/// assert_e2e().eq(stdout, file!["stderr.term.svg"]);
/// ```
/// ```console
/// $ SNAPSHOTS=overwrite cargo test
/// ```
pub fn assert_ui() -> snapbox::Assert {
    let mut subs = snapbox::Redactions::new();
    subs.extend(MIN_LITERAL_REDACTIONS.into_iter().cloned())
        .unwrap();
    add_test_support_redactions(&mut subs);
    add_regex_redactions(&mut subs);

    snapbox::Assert::new()
        .action_env(snapbox::assert::DEFAULT_ACTION_ENV)
        .redact_with(subs)
}

/// Assertion policy for functional end-to-end tests
///
/// This emphasizes showing as much content as possible at the cost of more brittleness
///
/// # Snapshots
///
/// Updating of snapshots is controlled with the `SNAPSHOTS` environment variable:
///
/// - `skip`: do not run the tests
/// - `ignore`: run the tests but ignore their failure
/// - `verify`: run the tests
/// - `overwrite`: update the snapshots based on the output of the tests
///
/// # Patterns
///
/// - `[..]` is a character wildcard, stopping at line breaks
/// - `\n...\n` is a multi-line wildcard
/// - `[EXE]` matches the exe suffix for the current platform
/// - `[ROOT]` matches [`paths::root()`][crate::paths::root]
/// - `[ROOTURL]` matches [`paths::root()`][crate::paths::root] as a URL
///
/// # Normalization
///
/// In addition to the patterns described above, text is normalized
/// in such a way to avoid unwanted differences. The normalizations are:
///
/// - Backslashes are converted to forward slashes to deal with Windows paths.
///   This helps so that all tests can be written assuming forward slashes.
///   Other heuristics are applied to try to ensure Windows-style paths aren't
///   a problem.
/// - Carriage returns are removed, which can help when running on Windows.
///
/// # Example
///
/// ```no_run
/// # use cargo_test_support::compare::assert_e2e;
/// # use cargo_test_support::str;
/// # let p = cargo_test_support::project().build();
/// assert_e2e().eq(p.read_lockfile(), str![]);
/// ```
/// ```console
/// $ SNAPSHOTS=overwrite cargo test
/// ```
pub fn assert_e2e() -> snapbox::Assert {
    let mut subs = snapbox::Redactions::new();
    subs.extend(MIN_LITERAL_REDACTIONS.into_iter().cloned())
        .unwrap();
    subs.extend(E2E_LITERAL_REDACTIONS.into_iter().cloned())
        .unwrap();
    add_test_support_redactions(&mut subs);
    add_regex_redactions(&mut subs);

    snapbox::Assert::new()
        .action_env(snapbox::assert::DEFAULT_ACTION_ENV)
        .redact_with(subs)
}

fn add_test_support_redactions(subs: &mut snapbox::Redactions) {
    let root = paths::root();
    // Use `from_file_path` instead of `from_dir_path` so the trailing slash is
    // put in the users output, rather than hidden in the variable
    let root_url = url::Url::from_file_path(&root).unwrap().to_string();

    subs.insert("[ROOT]", root).unwrap();
    subs.insert("[ROOTURL]", root_url).unwrap();
    subs.insert("[HOST_TARGET]", rustc_host()).unwrap();
    if let Some(alt_target) = try_alternate() {
        subs.insert("[ALT_TARGET]", alt_target).unwrap();
    }
}

fn add_regex_redactions(subs: &mut snapbox::Redactions) {
    // For e2e tests
    subs.insert(
        "[ELAPSED]",
        regex!(r"\[FINISHED\].*in (?<redacted>[0-9]+(\.[0-9]+)?(m [0-9]+)?)s"),
    )
    .unwrap();
    // for UI tests
    subs.insert(
        "[ELAPSED]",
        regex!(r"Finished.*in (?<redacted>[0-9]+(\.[0-9]+)?(m [0-9]+)?)s"),
    )
    .unwrap();
    // output from libtest
    subs.insert(
        "[ELAPSED]",
        regex!(r"; finished in (?<redacted>[0-9]+(\.[0-9]+)?(m [0-9]+)?)s"),
    )
    .unwrap();
    subs.insert(
        "[FILE_NUM]",
        regex!(r"\[(REMOVED|SUMMARY)\] (?<redacted>[1-9][0-9]*) files"),
    )
    .unwrap();
    subs.insert(
        "[FILE_SIZE]",
        regex!(r"(?<redacted>[0-9]+(\.[0-9]+)?([a-zA-Z]i)?)B\s"),
    )
    .unwrap();
    subs.insert(
        "[HASH]",
        regex!(r"home/\.cargo/registry/(cache|index|src)/-(?<redacted>[a-z0-9]+)"),
    )
    .unwrap();
    subs.insert(
        "[HASH]",
        regex!(r"\.cargo/target/(?<redacted>[0-9a-f]{2}/[0-9a-f]{14})"),
    )
    .unwrap();
    subs.insert("[HASH]", regex!(r"/[a-z0-9\-_]+-(?<redacted>[0-9a-f]{16})"))
        .unwrap();
    subs.insert(
        "[AVG_ELAPSED]",
        regex!(r"(?<redacted>[0-9]+(\.[0-9]+)?) ns/iter"),
    )
    .unwrap();
    subs.insert(
        "[JITTER]",
        regex!(r"ns/iter \(\+/- (?<redacted>[0-9]+(\.[0-9]+)?)\)"),
    )
    .unwrap();

    // Following 3 subs redact:
    //   "1719325877.527949100s, 61549498ns after last build at 1719325877.466399602s"
    //   "1719503592.218193216s, 1h 1s after last build at 1719499991.982681034s"
    // into "[DIRTY_REASON_NEW_TIME], [DIRTY_REASON_DIFF] after last build at [DIRTY_REASON_OLD_TIME]"
    subs.insert(
        "[TIME_DIFF_AFTER_LAST_BUILD]",
        regex!(r"(?<redacted>[0-9]+(\.[0-9]+)?s, (\s?[0-9]+(\.[0-9]+)?(s|ns|h))+ after last build at [0-9]+(\.[0-9]+)?s)"),
       )
       .unwrap();
}

static MIN_LITERAL_REDACTIONS: &[(&str, &str)] = &[
    ("[EXE]", std::env::consts::EXE_SUFFIX),
    ("[BROKEN_PIPE]", "Broken pipe (os error 32)"),
    ("[BROKEN_PIPE]", "The pipe is being closed. (os error 232)"),
    // Unix message for an entity was not found
    ("[NOT_FOUND]", "No such file or directory (os error 2)"),
    // Windows message for an entity was not found
    (
        "[NOT_FOUND]",
        "The system cannot find the file specified. (os error 2)",
    ),
    (
        "[NOT_FOUND]",
        "The system cannot find the path specified. (os error 3)",
    ),
    ("[NOT_FOUND]", "Access is denied. (os error 5)"),
    ("[NOT_FOUND]", "program not found"),
    // Unix message for exit status
    ("[EXIT_STATUS]", "exit status"),
    // Windows message for exit status
    ("[EXIT_STATUS]", "exit code"),
];
static E2E_LITERAL_REDACTIONS: &[(&str, &str)] = &[
    ("[RUNNING]", "     Running"),
    ("[COMPILING]", "   Compiling"),
    ("[CHECKING]", "    Checking"),
    ("[COMPLETED]", "   Completed"),
    ("[CREATED]", "     Created"),
    ("[CREATING]", "    Creating"),
    ("[CREDENTIAL]", "  Credential"),
    ("[DOWNGRADING]", " Downgrading"),
    ("[FINISHED]", "    Finished"),
    ("[ERROR]", "error:"),
    ("[WARNING]", "warning:"),
    ("[NOTE]", "note:"),
    ("[HELP]", "help:"),
    ("[DOCUMENTING]", " Documenting"),
    ("[SCRAPING]", "    Scraping"),
    ("[FRESH]", "       Fresh"),
    ("[DIRTY]", "       Dirty"),
    ("[LOCKING]", "     Locking"),
    ("[UPDATING]", "    Updating"),
    ("[UPGRADING]", "   Upgrading"),
    ("[ADDING]", "      Adding"),
    ("[REMOVING]", "    Removing"),
    ("[REMOVED]", "     Removed"),
    ("[UNCHANGED]", "   Unchanged"),
    ("[DOCTEST]", "   Doc-tests"),
    ("[PACKAGING]", "   Packaging"),
    ("[PACKAGED]", "    Packaged"),
    ("[DOWNLOADING]", " Downloading"),
    ("[DOWNLOADED]", "  Downloaded"),
    ("[UPLOADING]", "   Uploading"),
    ("[UPLOADED]", "    Uploaded"),
    ("[VERIFYING]", "   Verifying"),
    ("[ARCHIVING]", "   Archiving"),
    ("[INSTALLING]", "  Installing"),
    ("[REPLACING]", "   Replacing"),
    ("[UNPACKING]", "   Unpacking"),
    ("[SUMMARY]", "     Summary"),
    ("[FIXED]", "       Fixed"),
    ("[FIXING]", "      Fixing"),
    ("[IGNORED]", "     Ignored"),
    ("[INSTALLED]", "   Installed"),
    ("[REPLACED]", "    Replaced"),
    ("[BUILDING]", "    Building"),
    ("[LOGIN]", "       Login"),
    ("[LOGOUT]", "      Logout"),
    ("[YANK]", "        Yank"),
    ("[OWNER]", "       Owner"),
    ("[MIGRATING]", "   Migrating"),
    ("[EXECUTABLE]", "  Executable"),
    ("[SKIPPING]", "    Skipping"),
    ("[WAITING]", "     Waiting"),
    ("[PUBLISHED]", "   Published"),
    ("[BLOCKING]", "    Blocking"),
    ("[GENERATED]", "   Generated"),
    ("[OPENING]", "     Opening"),
];

/// Normalizes the output so that it can be compared against the expected value.
fn normalize_actual(actual: &str, cwd: Option<&Path>) -> String {
    // It's easier to read tabs in outputs if they don't show up as literal
    // hidden characters
    let actual = actual.replace('\t', "<tab>");
    if cfg!(windows) {
        // Let's not deal with \r\n vs \n on windows...
        let actual = actual.replace('\r', "");
        normalize_windows(&actual, cwd)
    } else {
        actual
    }
}

/// Normalizes the expected string so that it can be compared against the actual output.
fn normalize_expected(expected: &str, cwd: Option<&Path>) -> String {
    let expected = replace_dirty_msvc(expected);
    let expected = substitute_macros(&expected);

    if cfg!(windows) {
        normalize_windows(&expected, cwd)
    } else {
        let expected = match cwd {
            None => expected,
            Some(cwd) => expected.replace("[CWD]", &cwd.display().to_string()),
        };
        let expected = expected.replace("[ROOT]", &paths::root().display().to_string());
        expected
    }
}

fn replace_dirty_msvc_impl(s: &str, is_msvc: bool) -> String {
    if is_msvc {
        s.replace("[DIRTY-MSVC]", "[DIRTY]")
    } else {
        use itertools::Itertools;

        let mut new = s
            .lines()
            .filter(|it| !it.starts_with("[DIRTY-MSVC]"))
            .join("\n");

        if s.ends_with("\n") {
            new.push_str("\n");
        }

        new
    }
}

fn replace_dirty_msvc(s: &str) -> String {
    replace_dirty_msvc_impl(s, cfg!(target_env = "msvc"))
}

/// Normalizes text for both actual and expected strings on Windows.
fn normalize_windows(text: &str, cwd: Option<&Path>) -> String {
    // Let's not deal with / vs \ (windows...)
    let text = text.replace('\\', "/");

    // Weirdness for paths on Windows extends beyond `/` vs `\` apparently.
    // Namely paths like `c:\` and `C:\` are equivalent and that can cause
    // issues. The return value of `env::current_dir()` may return a
    // lowercase drive name, but we round-trip a lot of values through `Url`
    // which will auto-uppercase the drive name. To just ignore this
    // distinction we try to canonicalize as much as possible, taking all
    // forms of a path and canonicalizing them to one.
    let replace_path = |s: &str, path: &Path, with: &str| {
        let path_through_url = Url::from_file_path(path).unwrap().to_file_path().unwrap();
        let path1 = path.display().to_string().replace('\\', "/");
        let path2 = path_through_url.display().to_string().replace('\\', "/");
        s.replace(&path1, with)
            .replace(&path2, with)
            .replace(with, &path1)
    };

    let text = match cwd {
        None => text,
        Some(p) => replace_path(&text, p, "[CWD]"),
    };

    // Similar to cwd above, perform similar treatment to the root path
    // which in theory all of our paths should otherwise get rooted at.
    let root = paths::root();
    let text = replace_path(&text, &root, "[ROOT]");

    text
}

fn substitute_macros(input: &str) -> String {
    let mut result = input.to_owned();
    for &(pat, subst) in MIN_LITERAL_REDACTIONS {
        result = result.replace(pat, subst)
    }
    for &(pat, subst) in E2E_LITERAL_REDACTIONS {
        result = result.replace(pat, subst)
    }
    result
}

/// Checks that the given string contains the given lines, ignoring the order
/// of the lines.
///
/// See [Patterns](index.html#patterns) for more information on pattern matching.
pub(crate) fn match_unordered(expected: &str, actual: &str, cwd: Option<&Path>) -> Result<()> {
    let expected = normalize_expected(expected, cwd);
    let actual = normalize_actual(actual, cwd);
    let e: Vec<_> = expected.lines().map(|line| WildStr::new(line)).collect();
    let mut a: Vec<_> = actual.lines().map(|line| WildStr::new(line)).collect();
    // match more-constrained lines first, although in theory we'll
    // need some sort of recursive match here. This handles the case
    // that you expect "a\n[..]b" and two lines are printed out,
    // "ab\n"a", where technically we do match unordered but a naive
    // search fails to find this. This simple sort at least gets the
    // test suite to pass for now, but we may need to get more fancy
    // if tests start failing again.
    a.sort_by_key(|s| s.line.len());
    let mut changes = Vec::new();
    let mut a_index = 0;
    let mut failure = false;

    use crate::diff::Change;
    for (e_i, e_line) in e.into_iter().enumerate() {
        match a.iter().position(|a_line| e_line == *a_line) {
            Some(index) => {
                let a_line = a.remove(index);
                changes.push(Change::Keep(e_i, index, a_line));
                a_index += 1;
            }
            None => {
                failure = true;
                changes.push(Change::Remove(e_i, e_line));
            }
        }
    }
    for unmatched in a {
        failure = true;
        changes.push(Change::Add(a_index, unmatched));
        a_index += 1;
    }
    if failure {
        bail!(
            "Expected lines did not match (ignoring order):\n{}\n",
            diff::render_colored_changes(&changes)
        );
    } else {
        Ok(())
    }
}

/// Checks that the given string contains the given contiguous lines
/// somewhere.
///
/// See [Patterns](index.html#patterns) for more information on pattern matching.
pub(crate) fn match_contains(expected: &str, actual: &str, cwd: Option<&Path>) -> Result<()> {
    let expected = normalize_expected(expected, cwd);
    let actual = normalize_actual(actual, cwd);
    let e: Vec<_> = expected.lines().map(|line| WildStr::new(line)).collect();
    let a: Vec<_> = actual.lines().map(|line| WildStr::new(line)).collect();
    if e.len() == 0 {
        bail!("expected length must not be zero");
    }
    for window in a.windows(e.len()) {
        if window == e {
            return Ok(());
        }
    }
    bail!(
        "expected to find:\n\
         {}\n\n\
         did not find in output:\n\
         {}",
        expected,
        actual
    );
}

/// Checks that the given string does not contain the given contiguous lines
/// anywhere.
///
/// See [Patterns](index.html#patterns) for more information on pattern matching.
pub(crate) fn match_does_not_contain(
    expected: &str,
    actual: &str,
    cwd: Option<&Path>,
) -> Result<()> {
    if match_contains(expected, actual, cwd).is_ok() {
        bail!(
            "expected not to find:\n\
             {}\n\n\
             but found in output:\n\
             {}",
            expected,
            actual
        );
    } else {
        Ok(())
    }
}

/// Checks that the given string contains the given contiguous lines
/// somewhere, and should be repeated `number` times.
///
/// See [Patterns](index.html#patterns) for more information on pattern matching.
pub(crate) fn match_contains_n(
    expected: &str,
    number: usize,
    actual: &str,
    cwd: Option<&Path>,
) -> Result<()> {
    let expected = normalize_expected(expected, cwd);
    let actual = normalize_actual(actual, cwd);
    let e: Vec<_> = expected.lines().map(|line| WildStr::new(line)).collect();
    let a: Vec<_> = actual.lines().map(|line| WildStr::new(line)).collect();
    if e.len() == 0 {
        bail!("expected length must not be zero");
    }
    let matches = a.windows(e.len()).filter(|window| *window == e).count();
    if matches == number {
        Ok(())
    } else {
        bail!(
            "expected to find {} occurrences of:\n\
             {}\n\n\
             but found {} matches in the output:\n\
             {}",
            number,
            expected,
            matches,
            actual
        )
    }
}

/// Checks that the given string has a line that contains the given patterns,
/// and that line also does not contain the `without` patterns.
///
/// See [Patterns](index.html#patterns) for more information on pattern matching.
///
/// See [`crate::Execs::with_stderr_line_without`] for an example and cautions
/// against using.
pub(crate) fn match_with_without(
    actual: &str,
    with: &[String],
    without: &[String],
    cwd: Option<&Path>,
) -> Result<()> {
    let actual = normalize_actual(actual, cwd);
    let norm = |s: &String| format!("[..]{}[..]", normalize_expected(s, cwd));
    let with: Vec<_> = with.iter().map(norm).collect();
    let without: Vec<_> = without.iter().map(norm).collect();
    let with_wild: Vec<_> = with.iter().map(|w| WildStr::new(w)).collect();
    let without_wild: Vec<_> = without.iter().map(|w| WildStr::new(w)).collect();

    let matches: Vec<_> = actual
        .lines()
        .map(WildStr::new)
        .filter(|line| with_wild.iter().all(|with| with == line))
        .filter(|line| !without_wild.iter().any(|without| without == line))
        .collect();
    match matches.len() {
        0 => bail!(
            "Could not find expected line in output.\n\
             With contents: {:?}\n\
             Without contents: {:?}\n\
             Actual stderr:\n\
             {}\n",
            with,
            without,
            actual
        ),
        1 => Ok(()),
        _ => bail!(
            "Found multiple matching lines, but only expected one.\n\
             With contents: {:?}\n\
             Without contents: {:?}\n\
             Matching lines:\n\
             {}\n",
            with,
            without,
            itertools::join(matches, "\n")
        ),
    }
}

/// A single line string that supports `[..]` wildcard matching.
pub(crate) struct WildStr<'a> {
    has_meta: bool,
    line: &'a str,
}

impl<'a> WildStr<'a> {
    pub fn new(line: &'a str) -> WildStr<'a> {
        WildStr {
            has_meta: line.contains("[..]"),
            line,
        }
    }
}

impl<'a> PartialEq for WildStr<'a> {
    fn eq(&self, other: &Self) -> bool {
        match (self.has_meta, other.has_meta) {
            (false, false) => self.line == other.line,
            (true, false) => meta_cmp(self.line, other.line),
            (false, true) => meta_cmp(other.line, self.line),
            (true, true) => panic!("both lines cannot have [..]"),
        }
    }
}

fn meta_cmp(a: &str, mut b: &str) -> bool {
    for (i, part) in a.split("[..]").enumerate() {
        match b.find(part) {
            Some(j) => {
                if i == 0 && j != 0 {
                    return false;
                }
                b = &b[j + part.len()..];
            }
            None => return false,
        }
    }
    b.is_empty() || a.ends_with("[..]")
}

impl fmt::Display for WildStr<'_> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str(&self.line)
    }
}

impl fmt::Debug for WildStr<'_> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{:?}", self.line)
    }
}

pub struct InMemoryDir {
    files: Vec<(PathBuf, Data)>,
}

impl InMemoryDir {
    pub fn paths(&self) -> impl Iterator<Item = &Path> {
        self.files.iter().map(|(p, _)| p.as_path())
    }

    #[track_caller]
    pub fn assert_contains(&self, expected: &Self) {
        use std::fmt::Write as _;
        let assert = assert_e2e();
        let mut errs = String::new();
        for (path, expected_data) in &expected.files {
            let actual_data = self
                .files
                .iter()
                .find_map(|(p, d)| (path == p).then(|| d.clone()))
                .unwrap_or_else(|| Data::new());
            if let Err(err) =
                assert.try_eq(Some(&path.display()), actual_data, expected_data.clone())
            {
                let _ = write!(&mut errs, "{err}");
            }
        }
        if !errs.is_empty() {
            panic!("{errs}")
        }
    }
}

impl<P, D> FromIterator<(P, D)> for InMemoryDir
where
    P: Into<std::path::PathBuf>,
    D: IntoData,
{
    fn from_iter<I: IntoIterator<Item = (P, D)>>(files: I) -> Self {
        let files = files
            .into_iter()
            .map(|(p, d)| (p.into(), d.into_data()))
            .collect();
        Self { files }
    }
}

impl<const N: usize, P, D> From<[(P, D); N]> for InMemoryDir
where
    P: Into<PathBuf>,
    D: IntoData,
{
    fn from(files: [(P, D); N]) -> Self {
        let files = files
            .into_iter()
            .map(|(p, d)| (p.into(), d.into_data()))
            .collect();
        Self { files }
    }
}

impl<P, D> From<std::collections::HashMap<P, D>> for InMemoryDir
where
    P: Into<PathBuf>,
    D: IntoData,
{
    fn from(files: std::collections::HashMap<P, D>) -> Self {
        let files = files
            .into_iter()
            .map(|(p, d)| (p.into(), d.into_data()))
            .collect();
        Self { files }
    }
}

impl<P, D> From<std::collections::BTreeMap<P, D>> for InMemoryDir
where
    P: Into<PathBuf>,
    D: IntoData,
{
    fn from(files: std::collections::BTreeMap<P, D>) -> Self {
        let files = files
            .into_iter()
            .map(|(p, d)| (p.into(), d.into_data()))
            .collect();
        Self { files }
    }
}

impl From<()> for InMemoryDir {
    fn from(_files: ()) -> Self {
        let files = Vec::new();
        Self { files }
    }
}

/// Create an `impl _ for InMemoryDir` for a generic tuple
///
/// Must pass in names for each tuple parameter for
/// - internal variable name
/// - `Path` type
/// - `Data` type
macro_rules! impl_from_tuple_for_inmemorydir {
    ($($var:ident $path:ident $data:ident),+) => {
        impl<$($path: Into<PathBuf>, $data: IntoData),+> From<($(($path, $data)),+ ,)> for InMemoryDir {
            fn from(files: ($(($path, $data)),+,)) -> Self {
                let ($($var),+ ,) = files;
                let files = [$(($var.0.into(), $var.1.into_data())),+];
                files.into()
            }
        }
    };
}

/// Extend `impl_from_tuple_for_inmemorydir`` to generate for the specified tuple and all smaller
/// tuples
macro_rules! impl_from_tuples_for_inmemorydir {
    ($var1:ident $path1:ident $data1:ident, $($var:ident $path:ident $data:ident),+) => {
        impl_from_tuples_for_inmemorydir!(__impl $var1 $path1 $data1; $($var $path $data),+);
    };
    (__impl $($var:ident $path:ident $data:ident),+; $var1:ident $path1:ident $data1:ident $(,$var2:ident $path2:ident $data2:ident)*) => {
        impl_from_tuple_for_inmemorydir!($($var $path $data),+);
        impl_from_tuples_for_inmemorydir!(__impl $($var $path $data),+, $var1 $path1 $data1; $($var2 $path2 $data2),*);
    };
    (__impl $($var:ident $path:ident $data:ident),+;) => {
        impl_from_tuple_for_inmemorydir!($($var $path $data),+);
    }
}

// Generate for tuples of size `1..=7`
impl_from_tuples_for_inmemorydir!(
    s1 P1 D1,
    s2 P2 D2,
    s3 P3 D3,
    s4 P4 D4,
    s5 P5 D5,
    s6 P6 D6,
    s7 P7 D7
);

#[cfg(test)]
mod test {
    use snapbox::assert_data_eq;
    use snapbox::prelude::*;
    use snapbox::str;

    use super::*;

    #[test]
    fn wild_str_cmp() {
        for (a, b) in &[
            ("a b", "a b"),
            ("a[..]b", "a b"),
            ("a[..]", "a b"),
            ("[..]", "a b"),
            ("[..]b", "a b"),
        ] {
            assert_eq!(WildStr::new(a), WildStr::new(b));
        }
        for (a, b) in &[("[..]b", "c"), ("b", "c"), ("b", "cb")] {
            assert_ne!(WildStr::new(a), WildStr::new(b));
        }
    }

    #[test]
    fn dirty_msvc() {
        let case = |expected: &str, wild: &str, msvc: bool| {
            assert_eq!(expected, &replace_dirty_msvc_impl(wild, msvc));
        };

        // no replacements
        case("aa", "aa", false);
        case("aa", "aa", true);

        // with replacements
        case(
            "\
[DIRTY] a",
            "\
[DIRTY-MSVC] a",
            true,
        );
        case(
            "",
            "\
[DIRTY-MSVC] a",
            false,
        );
        case(
            "\
[DIRTY] a
[COMPILING] a",
            "\
[DIRTY-MSVC] a
[COMPILING] a",
            true,
        );
        case(
            "\
[COMPILING] a",
            "\
[DIRTY-MSVC] a
[COMPILING] a",
            false,
        );

        // test trailing newline behavior
        case(
            "\
A
B
", "\
A
B
", true,
        );

        case(
            "\
A
B
", "\
A
B
", false,
        );

        case(
            "\
A
B", "\
A
B", true,
        );

        case(
            "\
A
B", "\
A
B", false,
        );

        case(
            "\
[DIRTY] a
",
            "\
[DIRTY-MSVC] a
",
            true,
        );
        case(
            "\n",
            "\
[DIRTY-MSVC] a
",
            false,
        );

        case(
            "\
[DIRTY] a",
            "\
[DIRTY-MSVC] a",
            true,
        );
        case(
            "",
            "\
[DIRTY-MSVC] a",
            false,
        );
    }

    #[test]
    fn redact_elapsed_time() {
        let mut subs = snapbox::Redactions::new();
        add_regex_redactions(&mut subs);

        assert_data_eq!(
            subs.redact("[FINISHED] `release` profile [optimized] target(s) in 5.5s"),
            str!["[FINISHED] `release` profile [optimized] target(s) in [ELAPSED]s"].raw()
        );
        assert_data_eq!(
            subs.redact("[FINISHED] `release` profile [optimized] target(s) in 1m 05s"),
            str!["[FINISHED] `release` profile [optimized] target(s) in [ELAPSED]s"].raw()
        );
    }
}