fix: setup Jest with TS

packages/utils/tests/auth.test.ts

@@ -0,0 +1,42 @@
+import { isValidEmail, isValidUsername } from '../src/auth'
+
+test('check valid username', () => {
+  const valid = ['alex', 'alex123', 'john_doe', 'john-doe', 'rudeus']
+
+  const invalid = ['root', 'admin', '12michael', 'Justin', 'testUser']
+
+  valid.forEach((username) => {
+    expect(isValidUsername(username)).toBe(true)
+  })
+
+  invalid.forEach((username) => {
+    expect(isValidUsername(username)).toBe(false)
+  })
+})
+
+test('check valid email', () => {
+  const validEmails = [
+    'user@example.com',
+    'user.name@example.co.uk',
+    'user1234@email.domain',
+    'user+tag@example.net',
+    'user@subdomain.example.com',
+    'user@123.45.67.89',
+  ]
+
+  const invalidEmails = [
+    'user@.com',
+    '@example.com',
+    'user@-invalid-domain.com',
+    'user@.123',
+    'user@.123.45.67',
+  ]
+
+  validEmails.forEach((email) => {
+    expect(isValidEmail(email)).toBe(true)
+  })
+
+  invalidEmails.forEach((email) => {
+    expect(isValidEmail(email)).toBe(false)
+  })
+})