Improves performance on MR refactor and adds specs

1 files changed, 31 insertions, 0 deletions

diff --git a/spec/javascripts/diffs/store/utils_spec.js b/spec/javascripts/diffs/store/utils_spec.js
index 5a024a0f2ad..32136d9ebff 100644
--- a/spec/javascripts/diffs/store/utils_spec.js
+++ b/spec/javascripts/diffs/store/utils_spec.js
@@ -176,4 +176,35 @@ describe('DiffsStoreUtils', () => {
       expect(linesWithReferences[1].metaData.newPos).toEqual(3);
     });
   });
+
+  describe('trimFirstCharOfLineContent', () => {
+    it('trims the line when it starts with a space', () => {
+      expect(utils.trimFirstCharOfLineContent({ richText: ' diff' })).toEqual({ richText: 'diff' });
+    });
+
+    it('trims the line when it starts with a +', () => {
+      expect(utils.trimFirstCharOfLineContent({ richText: '+diff' })).toEqual({ richText: 'diff' });
+    });
+
+    it('trims the line when it starts with a -', () => {
+      expect(utils.trimFirstCharOfLineContent({ richText: '-diff' })).toEqual({ richText: 'diff' });
+    });
+
+    it('does not trims the line when it starts with a letter', () => {
+      expect(utils.trimFirstCharOfLineContent({ richText: 'diff' })).toEqual({ richText: 'diff' });
+    });
+
+    it('does not modify the provided object', () => {
+      const lineObj = {
+        richText: ' diff',
+      };
+
+      utils.trimFirstCharOfLineContent(lineObj);
+      expect(lineObj).toEqual({ richText: ' diff' });
+    });
+
+    it('handles a undefined or null parameter', () => {
+      expect(utils.trimFirstCharOfLineContent()).toEqual({});
+    });
+  });
 });