1 files changed, 62 insertions, 0 deletions
diff --git a/spec/frontend/design_management_new/utils/error_messages_spec.js b/spec/frontend/design_management_new/utils/error_messages_spec.js
new file mode 100644
index 00000000000..eb5dc0fad20
--- /dev/null
+++ b/spec/frontend/design_management_new/utils/error_messages_spec.js
@@ -0,0 +1,62 @@
+import {
+  designDeletionError,
+  designUploadSkippedWarning,
+} from '~/design_management_new/utils/error_messages';
+
+const mockFilenames = n =>
+  Array(n)
+    .fill(0)
+    .map((_, i) => ({ filename: `${i + 1}.jpg` }));
+
+describe('Error message', () => {
+  describe('designDeletionError', () => {
+    const singularMsg = 'Could not delete a design. Please try again.';
+    const pluralMsg = 'Could not delete designs. Please try again.';
+
+    describe('when [singular=true]', () => {
+      it.each([[undefined], [true]])('uses singular grammar', singularOption => {
+        expect(designDeletionError({ singular: singularOption })).toEqual(singularMsg);
+      });
+    });
+
+    describe('when [singular=false]', () => {
+      it('uses plural grammar', () => {
+        expect(designDeletionError({ singular: false })).toEqual(pluralMsg);
+      });
+    });
+  });
+
+  describe.each([
+    [[], [], null],
+    [mockFilenames(1), mockFilenames(1), 'Upload skipped. 1.jpg did not change.'],
+    [
+      mockFilenames(2),
+      mockFilenames(2),
+      'Upload skipped. The designs you tried uploading did not change.',
+    ],
+    [
+      mockFilenames(2),
+      mockFilenames(1),
+      'Upload skipped. Some of the designs you tried uploading did not change: 1.jpg.',
+    ],
+    [
+      mockFilenames(6),
+      mockFilenames(5),
+      'Upload skipped. Some of the designs you tried uploading did not change: 1.jpg, 2.jpg, 3.jpg, 4.jpg, 5.jpg.',
+    ],
+    [
+      mockFilenames(7),
+      mockFilenames(6),
+      'Upload skipped. Some of the designs you tried uploading did not change: 1.jpg, 2.jpg, 3.jpg, 4.jpg, 5.jpg, and 1 more.',
+    ],
+    [
+      mockFilenames(8),
+      mockFilenames(7),
+      'Upload skipped. Some of the designs you tried uploading did not change: 1.jpg, 2.jpg, 3.jpg, 4.jpg, 5.jpg, and 2 more.',
+    ],
+  ])('designUploadSkippedWarning', (uploadedFiles, skippedFiles, expected) => {
+    test('returns expected warning message', () => {
+      expect(designUploadSkippedWarning(uploadedFiles, skippedFiles)).toBe(expected);
+    });
+  });
+});