1 files changed, 49 insertions, 0 deletions
diff --git a/spec/frontend/notes/components/multiline_comment_utils_spec.js b/spec/frontend/notes/components/multiline_comment_utils_spec.js
new file mode 100644
index 00000000000..261bfb106e7
--- /dev/null
+++ b/spec/frontend/notes/components/multiline_comment_utils_spec.js
@@ -0,0 +1,49 @@
+import {
+  getSymbol,
+  getStartLineNumber,
+  getEndLineNumber,
+} from '~/notes/components/multiline_comment_utils';
+
+describe('Multiline comment utilities', () => {
+  describe('getStartLineNumber', () => {
+    it.each`
+      lineCode        | type     | result
+      ${'abcdef_1_1'} | ${'old'} | ${'-1'}
+      ${'abcdef_1_1'} | ${'new'} | ${'+1'}
+      ${'abcdef_1_1'} | ${null}  | ${'1'}
+      ${'abcdef'}     | ${'new'} | ${''}
+      ${'abcdef'}     | ${'old'} | ${''}
+      ${'abcdef'}     | ${null}  | ${''}
+    `('returns line number', ({ lineCode, type, result }) => {
+      expect(getStartLineNumber({ start_line_code: lineCode, start_line_type: type })).toEqual(
+        result,
+      );
+    });
+  });
+  describe('getEndLineNumber', () => {
+    it.each`
+      lineCode        | type     | result
+      ${'abcdef_1_1'} | ${'old'} | ${'-1'}
+      ${'abcdef_1_1'} | ${'new'} | ${'+1'}
+      ${'abcdef_1_1'} | ${null}  | ${'1'}
+      ${'abcdef'}     | ${'new'} | ${''}
+      ${'abcdef'}     | ${'old'} | ${''}
+      ${'abcdef'}     | ${null}  | ${''}
+    `('returns line number', ({ lineCode, type, result }) => {
+      expect(getEndLineNumber({ end_line_code: lineCode, end_line_type: type })).toEqual(result);
+    });
+  });
+  describe('getSymbol', () => {
+    it.each`
+      type         | result
+      ${'new'}     | ${'+'}
+      ${'old'}     | ${'-'}
+      ${'unused'}  | ${''}
+      ${''}        | ${''}
+      ${null}      | ${''}
+      ${undefined} | ${''}
+    `('`$type` returns `$result`', ({ type, result }) => {
+      expect(getSymbol(type)).toEqual(result);
+    });
+  });
+});