[gnome-shell] tests: Add unit test for highlighter

[Marge Bot <marge-bot src gnome org>]

commit a4b6b07d78464c9e57aef11ca0cd7799b40daf39
Author: Sebastian Keller <skeller gnome org>
Date:   Wed Nov 17 03:05:05 2021 +0100

    tests: Add unit test for highlighter
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2033>

 tests/meson.build         |  12 +++++-
 tests/unit/highlighter.js | 106 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 117 insertions(+), 1 deletion(-)
---
diff --git a/tests/meson.build b/tests/meson.build
index c0431631f0..50fb601e9f 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -10,7 +10,17 @@ run_test = configure_file(
 testenv = environment()
 testenv.set('GSETTINGS_SCHEMA_DIR', join_paths(meson.build_root(), 'data'))
 
-foreach test : ['insertSorted', 'jsParse', 'markup', 'params', 'url', 'versionCompare']
+tests = [
+    'highlighter',
+    'insertSorted',
+    'jsParse',
+    'markup',
+    'params',
+    'url',
+    'versionCompare',
+]
+
+foreach test : tests
   test(test, run_test,
     args: 'unit/@0@.js'.format(test),
     env: testenv,
diff --git a/tests/unit/highlighter.js b/tests/unit/highlighter.js
new file mode 100644
index 0000000000..d582d38e34
--- /dev/null
+++ b/tests/unit/highlighter.js
@@ -0,0 +1,106 @@
+// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
+
+// Test cases for SearchResult description match highlighter
+
+const JsUnit = imports.jsUnit;
+const Pango = imports.gi.Pango;
+
+const Environment = imports.ui.environment;
+Environment.init();
+
+const Util = imports.misc.util;
+
+const tests = [
+    { input: 'abc cba',
+      terms: null,
+      output: 'abc cba' },
+    { input: 'abc cba',
+      terms: [],
+      output: 'abc cba' },
+    { input: 'abc cba',
+      terms: [''],
+      output: 'abc cba' },
+    { input: 'abc cba',
+      terms: ['a'],
+      output: '<b>a</b>bc cb<b>a</b>' },
+    { input: 'abc cba',
+      terms: ['a', 'a'],
+      output: '<b>a</b>bc cb<b>a</b>' },
+    { input: 'CaSe InSenSiTiVe',
+      terms: ['cas', 'sens'],
+      output: '<b>CaS</b>e In<b>SenS</b>iTiVe' },
+    { input: 'This contains the < character',
+      terms: null,
+      output: 'This contains the &lt; character' },
+    { input: 'Don\'t',
+      terms: ['t'],
+      output: 'Don&apos;<b>t</b>' },
+    { input: 'Don\'t',
+      terms: ['n\'t'],
+      output: 'Do<b>n&apos;t</b>' },
+    { input: 'Don\'t',
+      terms: ['o', 't'],
+      output: 'D<b>o</b>n&apos;<b>t</b>' },
+    { input: 'salt&pepper',
+      terms: ['salt'],
+      output: '<b>salt</b>&amp;pepper' },
+    { input: 'salt&pepper',
+      terms: ['salt', 'alt'],
+      output: '<b>salt</b>&amp;pepper' },
+    { input: 'salt&pepper',
+      terms: ['pepper'],
+      output: 'salt&amp;<b>pepper</b>' },
+    { input: 'salt&pepper',
+      terms: ['salt', 'pepper'],
+      output: '<b>salt</b>&amp;<b>pepper</b>' },
+    { input: 'salt&pepper',
+      terms: ['t', 'p'],
+      output: 'sal<b>t</b>&amp;<b>p</b>e<b>p</b><b>p</b>er' },
+    { input: 'salt&pepper',
+      terms: ['t', '&', 'p'],
+      output: 'sal<b>t</b><b>&amp;</b><b>p</b>e<b>p</b><b>p</b>er' },
+    { input: 'salt&pepper',
+      terms: ['e'],
+      output: 'salt&amp;p<b>e</b>pp<b>e</b>r' },
+    { input: 'salt&pepper',
+      terms: ['&a', '&am', '&amp', '&amp;'],
+      output: 'salt&amp;pepper' },
+    { input: '&&&&&',
+      terms: ['a'],
+      output: '&amp;&amp;&amp;&amp;&amp;' },
+    { input: '&;&;&;&;&;',
+      terms: ['a'],
+      output: '&amp;;&amp;;&amp;;&amp;;&amp;;' },
+    { input: '&;&;&;&;&;',
+      terms: [';'],
+      output: '&amp;<b>;</b>&amp;<b>;</b>&amp;<b>;</b>&amp;<b>;</b>&amp;<b>;</b>' },
+    { input: '&amp;',
+      terms: ['a'],
+      output: '&amp;<b>a</b>mp;' }
+];
+
+try {
+    for (let i = 0; i < tests.length; i++) {
+        let highlighter = new Util.Highlighter(tests[i].terms);
+        let output = highlighter.highlight(tests[i].input);
+
+        JsUnit.assertEquals(`Test ${i + 1} highlight ` +
+            `"${tests[i].terms}" in "${tests[i].input}"`,
+            output, tests[i].output);
+
+        let parsed = false;
+        try {
+            Pango.parse_markup(output, -1, '');
+            parsed = true;
+        } catch (e) {}
+        JsUnit.assertEquals(`Test ${i + 1} is valid markup`, true, parsed);
+    }
+} catch (e) {
+    if (typeof(e.isJsUnitException) != 'undefined'
+        && e.isJsUnitException)
+    {
+        if (e.comment)
+            log(`Error in: ${e.comment}`);
+    }
+    throw e;
+}