1 files changed, 43 insertions, 0 deletions
diff --git a/spec/javascripts/lib/utils/higlight_spec.js b/spec/javascripts/lib/utils/higlight_spec.js
new file mode 100644
index 00000000000..638bbf65ae9
--- /dev/null
+++ b/spec/javascripts/lib/utils/higlight_spec.js
@@ -0,0 +1,43 @@
+import highlight from '~/lib/utils/highlight';
+
+describe('highlight', () => {
+  it(`should appropriately surround substring matches`, () => {
+    const expected = 'g<b>i</b><b>t</b>lab';
+
+    expect(highlight('gitlab', 'it')).toBe(expected);
+  });
+
+  it(`should return an empty string in the case of invalid inputs`, () => {
+    [null, undefined].forEach(input => {
+      expect(highlight(input, 'match')).toBe('');
+    });
+  });
+
+  it(`should return the original value if match is null, undefined, or ''`, () => {
+    [null, undefined].forEach(match => {
+      expect(highlight('gitlab', match)).toBe('gitlab');
+    });
+  });
+
+  it(`should highlight matches in non-string inputs`, () => {
+    const expected = '123<b>4</b><b>5</b>6';
+
+    expect(highlight(123456, 45)).toBe(expected);
+  });
+
+  it(`should sanitize the input string before highlighting matches`, () => {
+    const expected = 'hello <b>w</b>orld';
+
+    expect(highlight('hello <b>world</b>', 'w')).toBe(expected);
+  });
+
+  it(`should not highlight anything if no matches are found`, () => {
+    expect(highlight('gitlab', 'hello')).toBe('gitlab');
+  });
+
+  it(`should allow wrapping elements to be customized`, () => {
+    const expected = '1<hello>2</hello>3';
+
+    expect(highlight('123', '2', '<hello>', '</hello>')).toBe(expected);
+  });
+});