add unit tests

tests/utils/verifiedEmail.test.ts

@@ -0,0 +1,46 @@
+import { describe, expect, it } from 'vitest';
+import { shouldShowVerifiedEmailBadge } from '../../src/utils/verifiedEmail';
+
+describe('shouldShowVerifiedEmailBadge', () => {
+    it('returns false when email has not been verified', () => {
+        expect(
+            shouldShowVerifiedEmailBadge({
+                verifiedAt: null,
+                persistedEmail: 'a@example.com',
+                currentEmail: 'a@example.com',
+                isEditing: false,
+            }),
+        ).toBe(false);
+    });
+
+    it('returns true when verified and not editing', () => {
+        expect(
+            shouldShowVerifiedEmailBadge({
+                verifiedAt: '2025-01-01T10:00:00Z',
+                persistedEmail: 'a@example.com',
+                currentEmail: 'other@example.com',
+                isEditing: false,
+            }),
+        ).toBe(true);
+    });
+
+    it('while editing, returns true only when trimmed current email matches persisted email', () => {
+        expect(
+            shouldShowVerifiedEmailBadge({
+                verifiedAt: '2025-01-01T10:00:00Z',
+                persistedEmail: 'a@example.com',
+                currentEmail: '  a@example.com ',
+                isEditing: true,
+            }),
+        ).toBe(true);
+
+        expect(
+            shouldShowVerifiedEmailBadge({
+                verifiedAt: '2025-01-01T10:00:00Z',
+                persistedEmail: 'a@example.com',
+                currentEmail: 'other@example.com',
+                isEditing: true,
+            }),
+        ).toBe(false);
+    });
+});