test(email): add tests for email normalization

Author: re-vlad

scripts/migrate/test/email.test.ts

@@ -0,0 +1,54 @@
+/**
+ * Copyright 2026 GitProxy Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { describe, expect, test } from 'vitest';
+import { createRequire } from 'node:module';
+
+const require = createRequire(import.meta.url);
+const { normalizeEmail, isEmailFormatValid } = require('../lib/email.js');
+
+describe('scripts/migrate/lib/email.js', () => {
+  describe('normalizeEmail trims, lowercases, and coerces falsy to empty string', () => {
+    test.each([
+      [null, ''],
+      [undefined, ''],
+      ['', ''],
+      ['   ', ''],
+    ])('returns %j when input is %j', (input, expected) => {
+      expect(normalizeEmail(input)).toBe(expected);
+    });
+  });
+
+  describe('isEmailFormatValid applies a basic format check after normalization', () => {
+    describe('accepts addresses that match the migration regex', () => {
+      test.each(['a@b.c', 'user+tag@example.com', 'alice@mail.example.com'])(
+        'treats %s as valid',
+        (email) => {
+          expect(isEmailFormatValid(email)).toBe(true);
+        },
+      );
+    });
+
+    describe('rejects addresses that fail the migration regex', () => {
+      test.each(['', 'a@b', '@x.com', 'a@', 'a @b.com', 'a@@b.com'])(
+        'treats %s as invalid',
+        (email) => {
+          expect(isEmailFormatValid(email)).toBe(false);
+        },
+      );
+    });
+  });
+});