Add insta-based snapshot tests that cover side-by-side format

I'm going to fix inline diff issue #704, and found that the inline format isn't covered by CLI tests. I could duplicate compare_all.sh to test various formats, but it's uneasy to review that a new formatting is better than the previous version. I think snapshot testing will help guarantee the output quality without increasing maintenance burden too much. If we like the idea, maybe we can migrate some of compare_all.sh tests to the insta-based ones. Note that this will add ~10sec to "cargo test" runs.
Wilfred · Jul 31, 2024 · 245b464 · 245b464
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diff --git a/.gitignore b/.gitignore
@@ -5,5 +5,6 @@ flamegraph.svg
 .idea
 
 sample_files/compare.result
+tests/snapshots/*.snap.new
 
 notes.md
diff --git a/manual/src/adding_a_parser.md b/manual/src/adding_a_parser.md
@@ -139,6 +139,15 @@ $ ./sample_files/compare_all.sh
 $ cp sample_files/compare.result sample_files/compare.expected
 ```
 
+Run the CLI test and [update the snapshots][insta] as well.
+
+```
+$ cargo insta test
+$ cargo insta accept
+```
+
+[insta]: https://insta.rs/docs/quickstart/#reviewing-snapshots
+
 ## Maintenance
 
 To update a parser that is already imported, use `git subtree pull`.

diff --git a/tests/cli.rs b/tests/cli.rs
@@ -1,4 +1,5 @@
 use std::process::Command;
+use std::str;
 
 use assert_cmd::prelude::*;
 use predicates::prelude::*;
@@ -269,3 +270,45 @@ fn walk_hidden_items() {
             .and(predicate::str::contains("after"));
     cmd.assert().stdout(predicate_fn);
 }
+
+const MAX_SAMPLE_FILE_SIZE: u64 = 10_000;
+
+#[test]
+fn samples_side_by_side() {
+    insta::glob!("../sample_files", "*_1.*", |left_file| {
+        let base_dir = left_file.parent().unwrap().parent().unwrap();
+        let file_name = left_file.file_name().unwrap().to_str().unwrap();
+        let right_file = left_file.with_file_name(file_name.replace("_1.", "_2."));
+        // Large sample files are excluded because it's slow to diff with debug
+        // binary, and the snapshot results wouldn't help review changes.
+        if left_file.metadata().unwrap().len() > MAX_SAMPLE_FILE_SIZE
+            || right_file.metadata().unwrap().len() > MAX_SAMPLE_FILE_SIZE
+        {
+            eprintln!("Skipping large sample: {file_name}");
+            return;
+        }
+        // TODO: Fix CI instability on the following architectures:
+        // x86_64-apple-darwin, x86_64-pc-windows-msvc, aarch64-apple-darwin
+        if file_name == "f_sharp_1.fs" {
+            eprintln!("Skipping unstable sample: {file_name}");
+            return;
+        }
+
+        let to_path_arg = |path: &Path| {
+            let short_path = path.strip_prefix(base_dir).unwrap();
+            let short_str = short_path.to_str().unwrap();
+            short_str.replace(std::path::MAIN_SEPARATOR, "/")
+        };
+        let mut cmd = get_base_command();
+        let assert = cmd
+            .arg("--color=always")
+            .arg("--display=side-by-side")
+            .arg("--width=160")
+            .arg(to_path_arg(left_file))
+            .arg(to_path_arg(&right_file))
+            .assert()
+            .success();
+        let stdout = str::from_utf8(&assert.get_output().stdout).unwrap();
+        insta::assert_snapshot!(stdout);
+    });
+}
diff --git a/tests/snapshots/cli__samples_side_by_side@Session_1.kt.snap b/tests/snapshots/cli__samples_side_by_side@Session_1.kt.snap
@@ -0,0 +1,32 @@
+---
+source: tests/cli.rs
+expression: stdout
+input_file: sample_files/Session_1.kt
+---
+[1m[93msample_files/Session_2.kt[39m[0m[2m --- 1/2 --- Kotlin[0m
+[2m 96 [0m    [94;3m/**[0m                                                                     [2m 96 [0m    [94;3m/**[0m
+[2m 97 [0m[94;3m     * The session's photo URL.[0m                                             [2m 97 [0m[94;3m     * The session's photo URL.[0m
+[2m 98 [0m[94;3m     */[0m                                                                     [2m 98 [0m[94;3m     */[0m
+[91;1m 99 [0m    [1mval[0m photoUrl: [91mString?[0m,                                                  [92;1m 99 [0m    [1mval[0m photoUrl: [92;1mString[0m,
+[2m100 [0m                                                                            [2m100 [0m
+[2m101 [0m    [94;3m/**[0m                                                                     [2m101 [0m    [94;3m/**[0m
+[2m102 [0m[94;3m     * IDs of the sessions related to this session.[0m                         [2m102 [0m[94;3m     * IDs of the sessions related to this session.[0m
+
+[1msample_files/Session_2.kt[0m[2m --- 2/2 --- Kotlin[0m
+[2m114 [0m        return startTime [1m<=[0m now [1m&&[0m endTime [1m>=[0m now                           [2m114 [0m        return startTime [1m<=[0m now [1m&&[0m endTime [1m>=[0m now
+[2m115 [0m    }                                                                       [2m115 [0m    }
+[2m... [0m                                                                            [92;1m116 [0m
+[2m... [0m                                                                            [92;1m117 [0m    [92;1mval[0m [92mhasPhoto[0m [92minline[0m [92mget[0m[92;1m([0m[92;1m)[0m [92;1m=[0m [92mphotoUrl[0m[92m.[0m[92misNotEmpty[0m[92;1m([0m[92;1m)[0m
+[2m116 [0m                                                                            [2m118 [0m
+[2m117 [0m    [94;3m/**[0m                                                                     [2m119 [0m    [94;3m/**[0m
+[2m118 [0m[94;3m     * Returns whether the session has a video or not. A session could be l[0m [2m120 [0m[94;3m     * Returns whether the session has a video or not. A session could be l[0m
+[2m[2m... [0m[0m[94;3mive streaming or have a[0m                                                     [2m[2m... [0m[0m[94;3mive streaming or have a[0m
+[2m119 [0m[94;3m     * recorded session. Both live stream and recorded videos are stored in[0m [2m121 [0m[94;3m     * recorded session. Both live stream and recorded videos are stored in[0m
+[2m[2m... [0m[0m[94;3m [Session.youTubeUrl].[0m                                                      [2m[2m... [0m[0m[94;3m [Session.youTubeUrl].[0m
+[2m120 [0m[94;3m     */[0m                                                                     [2m122 [0m[94;3m     */[0m
+[91;1m121 [0m    [91;1mfun[0m hasVideo() [1m=[0m youTubeUrl.isNotEmpty()                                [92;1m123 [0m    [92;1mval[0m hasVideo [92minline[0m [92mget[0m() [1m=[0m youTubeUrl.isNotEmpty()
+[2m... [0m                                                                            [92;1m124 [0m
+[2m... [0m                                                                            [92;1m125 [0m    [92;1mval[0m [92mhasPhotoOrVideo[0m [92minline[0m [92mget[0m[92;1m([0m[92;1m)[0m [92;1m=[0m [92mhasPhoto[0m [92;1m||[0m [92mhasVideo[0m
+[2m122 [0m                                                                            [2m126 [0m
+[2m123 [0m    [94;3m/**[0m                                                                     [2m127 [0m    [94;3m/**[0m
+[2m124 [0m[94;3m     * The year the session was held.[0m                                       [2m128 [0m[94;3m     * The year the session was held.[0m
diff --git a/tests/snapshots/cli__samples_side_by_side@ada_1.adb.snap b/tests/snapshots/cli__samples_side_by_side@ada_1.adb.snap
@@ -0,0 +1,14 @@
+---
+source: tests/cli.rs
+expression: stdout
+input_file: sample_files/ada_1.adb
+---
+[1m[93msample_files/ada_2.adb[39m[0m[2m --- Ada[0m
+[91;1m1 [0m [1mwith[0m Ada.Text_IO; [91;1muse[0m [91mAda[0m[91m.[0m[91mText_IO[0m[91m;[0m [1mprocedure[0m Hello [1mis[0m [1mbegin[0m Put_Line ([91m"[0m[91mHello[0m [2m1 [0m[1mwith[0m Ada.Text_IO;
+[91;1m[2m. [0m[0m[91m [0m[91;1;4mWORLD[0m[91m![0m[91m"[0m); [1mend[0m Hello;                                                         [2m[2m. [0m[0m
+[2m. [0m                                                                              [92;1m2 [0m
+[2m. [0m                                                                              [2m3 [0m[1mprocedure[0m Hello [1mis[0m
+[2m. [0m                                                                              [92;1m4 [0m  [92;1mpackage[0m [92mTIO[0m [92mrenames[0m [92mAda[0m[92m.[0m[92mText_IO[0m[92m;[0m
+[2m. [0m                                                                              [2m5 [0m[1mbegin[0m
+[2m. [0m                                                                              [92;1m6 [0m  [92mTIO[0m[92m.[0mPut_Line ([92m"[0m[92mHello[0m[92m [0m[92;1;4mWorld[0m[92m![0m[92m"[0m);
+[2m. [0m                                                                              [2m7 [0m[1mend[0m Hello;
diff --git a/tests/snapshots/cli__samples_side_by_side@added_line_1.txt.snap b/tests/snapshots/cli__samples_side_by_side@added_line_1.txt.snap
@@ -0,0 +1,9 @@
+---
+source: tests/cli.rs
+expression: stdout
+input_file: sample_files/added_line_1.txt
+---
+[1m[93msample_files/added_line_2.txt[39m[0m[2m --- Text[0m
+[2m1 [0m[2m1 [0mpotato
+[2m2 [0m[2m2 [0mtomato
+[2m  [0m[92;1m3 [0m[92;1mlegato[0m
diff --git a/tests/snapshots/cli__samples_side_by_side@align_footer_1.txt.snap b/tests/snapshots/cli__samples_side_by_side@align_footer_1.txt.snap
@@ -0,0 +1,10 @@
+---
+source: tests/cli.rs
+expression: stdout
+input_file: sample_files/align_footer_1.txt
+---
+[1m[93msample_files/align_footer_2.txt[39m[0m[2m --- Text[0m
+[2m1 [0mbefore                                                                        [2m1 [0mbefore
+[91;1m2 [0m[91m [0m[91;1mfoo[0m[91;1m [0m[91mx[0m                                                                        [92;1m2 [0m[92m [0m[92mx[0m
+[91;1m3 [0m[91;1my[0m                                                                             [2m. [0m
+[2m4 [0mafter                                                                         [2m3 [0mafter
diff --git a/tests/snapshots/cli__samples_side_by_side@all_changed_1.js.snap b/tests/snapshots/cli__samples_side_by_side@all_changed_1.js.snap
@@ -0,0 +1,7 @@
+---
+source: tests/cli.rs
+expression: stdout
+input_file: sample_files/all_changed_1.js
+---
+[1m[93msample_files/all_changed_2.js[39m[0m[2m --- JavaScript[0m
+[91;1m1 [0m[91ma[0m                                                                             [92;1m1 [0m[92mb[0m
diff --git a/tests/snapshots/cli__samples_side_by_side@apex_1.cls.snap b/tests/snapshots/cli__samples_side_by_side@apex_1.cls.snap
@@ -0,0 +1,7 @@
+---
+source: tests/cli.rs
+expression: stdout
+input_file: sample_files/apex_1.cls
+---
+[1m[93msample_files/apex_2.cls[39m[0m[2m --- Apex[0m
+No syntactic changes.
diff --git a/tests/snapshots/cli__samples_side_by_side@bad_combine_1.rs.snap b/tests/snapshots/cli__samples_side_by_side@bad_combine_1.rs.snap
@@ -0,0 +1,33 @@
+---
+source: tests/cli.rs
+expression: stdout
+input_file: sample_files/bad_combine_1.rs
+---
+[1m[93msample_files/bad_combine_2.rs[39m[0m[2m --- 1/2 --- Rust[0m
+[91;1m 1 [0m                                                                             [2m. [0m
+[91;1m 2 [0m[91;1mfn[0m [91mcolumn_widths[0m[91;1m([0m                                                            [2m. [0m
+[91;1m 3 [0m    [91mhunks[0m[91m:[0m [91;1m&[0m[91;1m[[0m[91;1mHunk[0m[91;1m][0m[91m,[0m                                                          [2m. [0m
+[91;1m 4 [0m    [91mlhs_mps[0m[91m:[0m [91;1m&[0m[91;1m[[0m[91;1mMatchedPos[0m[91;1m][0m[91m,[0m                                                  [2m. [0m
+[91;1m 5 [0m    [91mrhs_mps[0m[91m:[0m [91;1m&[0m[91;1m[[0m[91;1mMatchedPos[0m[91;1m][0m[91m,[0m                                                  [2m. [0m
+[91;1m 6 [0m    [91mmax_lhs_src_line[0m[91m:[0m [91;1mLineNumber[0m[91m,[0m                                            [2m. [0m
+[91;1m 7 [0m    [91mmax_rhs_src_line[0m[91m:[0m [91;1mLineNumber[0m[91m,[0m                                            [2m. [0m
+[91;1m 8 [0m[91;1m)[0m  [91;1m{[0m                                                                         [2m. [0m
+[91;1m 9 [0m[91;1m}[0m                                                                            [2m. [0m
+[91;1m10 [0m                                                                             [2m. [0m
+[2m11 [0m[1mfn[0m display_line_nums(                                                        [2m1 [0m[1mfn[0m display_line_nums(
+[2m12 [0m) -> ([1mString[0m, [1mString[0m) {                                                      [2m2 [0m) -> ([1mString[0m, [1mString[0m) {
+[2m13 [0m    [1mlet[0m display_rhs_line_num: [1mString[0m = [1mmatch[0m rhs_line_num {                  [2m3 [0m    [1mlet[0m display_rhs_line_num: [1mString[0m = [1mmatch[0m rhs_line_num {
+[2m14 [0m        [1mSome[0m(line_num) => {                                                  [2m4 [0m        [1mSome[0m(line_num) => {
+[91;1m15 [0m            [1mlet[0m s = format_line_num_padded(line_num, [91mrhs_column_width[0m);      [92;1m5 [0m            [1mlet[0m s = format_line_num_padded(line_num, [92mwidths[0m[92m.[0m[92mrhs_line_nums[0m);
+[2m16 [0m            [1mif[0m rhs_lines_with_novel.contains([1m&[0mline_num) {                    [2m6 [0m            [1mif[0m rhs_lines_with_novel.contains([1m&[0mline_num) {
+[2m17 [0m                s.bright_green().to_string()                                 [2m7 [0m                s.bright_green().to_string()
+[2m18 [0m            } [1melse[0m {                                                         [2m8 [0m            } [1melse[0m {
+
+[1msample_files/bad_combine_2.rs[0m[2m --- 2/2 --- Rust[0m
+[2m21 [0m        }                                                                    [2m11 [0m        }
+[2m22 [0m        [1mNone[0m => format_missing_line_num(                                     [2m12 [0m        [1mNone[0m => format_missing_line_num(
+[2m23 [0m            prev_rhs_line_num.unwrap_or_else(|| [1m10[0m.into()),                  [2m13 [0m            prev_rhs_line_num.unwrap_or_else(|| [1m10[0m.into()),
+[91;1m24 [0m            [91mrhs_column_width[0m,                                                [92;1m14 [0m            [92mwidths[0m[92m.[0m[92mrhs_line_nums[0m,
+[2m25 [0m        ),                                                                   [2m15 [0m        ),
+[2m26 [0m    };                                                                       [2m16 [0m    };
+[2m27 [0m                                                                             [2m17 [0m
diff --git a/tests/snapshots/cli__samples_side_by_side@big_text_hunk_1.txt.snap b/tests/snapshots/cli__samples_side_by_side@big_text_hunk_1.txt.snap
@@ -0,0 +1,51 @@
+---
+source: tests/cli.rs
+expression: stdout
+input_file: sample_files/big_text_hunk_1.txt
+---
+[1m[93msample_files/big_text_hunk_2.txt[39m[0m[2m --- Text[0m
+[2m5 [0m[2m 5 [0mgithub.com/naoina/toml v0.1.1/go.mod h1:NBIhNtsFMo3G2szEBne+bO4gS192HuIYRqfvOWb4i1E=
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diff --git a/tests/snapshots/cli__samples_side_by_side@change_outer_1.el.snap b/tests/snapshots/cli__samples_side_by_side@change_outer_1.el.snap
@@ -0,0 +1,7 @@
+---
+source: tests/cli.rs
+expression: stdout
+input_file: sample_files/change_outer_1.el
+---
+[1m[93msample_files/change_outer_2.el[39m[0m[2m --- Emacs Lisp[0m
+[91;1m1 [0m[91;1m([0mlhs comma rhs[91;1m)[0m                                                               [92;1m1 [0m[92;1m[[0m[92;1m([0mlhs[92;1m)[0m comma rhs[92;1m][0m