1 files changed, 67 insertions, 0 deletions
diff --git a/spec/frontend/diffs/utils/interoperability_spec.js b/spec/frontend/diffs/utils/interoperability_spec.js
new file mode 100644
index 00000000000..2557e83cb4c
--- /dev/null
+++ b/spec/frontend/diffs/utils/interoperability_spec.js
@@ -0,0 +1,67 @@
+import {
+  getInteropInlineAttributes,
+  getInteropNewSideAttributes,
+  getInteropOldSideAttributes,
+  ATTR_TYPE,
+  ATTR_LINE,
+  ATTR_NEW_LINE,
+  ATTR_OLD_LINE,
+} from '~/diffs/utils/interoperability';
+
+describe('~/diffs/utils/interoperability', () => {
+  describe('getInteropInlineAttributes', () => {
+    it.each([
+      ['with null input', { input: null, output: null }],
+      [
+        'with type=old input',
+        {
+          input: { type: 'old', old_line: 3, new_line: 5 },
+          output: { [ATTR_TYPE]: 'old', [ATTR_LINE]: 3, [ATTR_OLD_LINE]: 3, [ATTR_NEW_LINE]: 5 },
+        },
+      ],
+      [
+        'with type=old-nonewline input',
+        {
+          input: { type: 'old-nonewline', old_line: 3, new_line: 5 },
+          output: { [ATTR_TYPE]: 'old', [ATTR_LINE]: 3, [ATTR_OLD_LINE]: 3, [ATTR_NEW_LINE]: 5 },
+        },
+      ],
+      [
+        'with type=new input',
+        {
+          input: { type: 'new', old_line: 3, new_line: 5 },
+          output: { [ATTR_TYPE]: 'new', [ATTR_LINE]: 5, [ATTR_OLD_LINE]: 3, [ATTR_NEW_LINE]: 5 },
+        },
+      ],
+      [
+        'with type=bogus input',
+        {
+          input: { type: 'bogus', old_line: 3, new_line: 5 },
+          output: { [ATTR_TYPE]: 'new', [ATTR_LINE]: 5, [ATTR_OLD_LINE]: 3, [ATTR_NEW_LINE]: 5 },
+        },
+      ],
+    ])('%s', (desc, { input, output }) => {
+      expect(getInteropInlineAttributes(input)).toEqual(output);
+    });
+  });
+
+  describe('getInteropOldSideAttributes', () => {
+    it.each`
+      input              | output
+      ${null}            | ${null}
+      ${{ old_line: 2 }} | ${{ [ATTR_TYPE]: 'old', [ATTR_LINE]: 2, [ATTR_OLD_LINE]: 2 }}
+    `('with input=$input', ({ input, output }) => {
+      expect(getInteropOldSideAttributes(input)).toEqual(output);
+    });
+  });
+
+  describe('getInteropNewSideAttributes', () => {
+    it.each`
+      input              | output
+      ${null}            | ${null}
+      ${{ new_line: 2 }} | ${{ [ATTR_TYPE]: 'new', [ATTR_LINE]: 2, [ATTR_NEW_LINE]: 2 }}
+    `('with input=$input', ({ input, output }) => {
+      expect(getInteropNewSideAttributes(input)).toEqual(output);
+    });
+  });
+});