Unit Tests for Password Hashing and Validation Utilities
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Test 1: Email Validation
  Valid email test@example.com: PASS
  Valid email user.name@domain.co.id: PASS
  Valid email admin+tag@site.org: PASS
  Invalid email "invalid": PASS
  Invalid email "@example.com": PASS
  Invalid email "user@": PASS
  Invalid email "user @example.com": PASS
  Invalid empty email: PASS

Test 2: Password Validation (minimum 8 characters)
  Valid password "password123" (11 chars): PASS
  Valid password "12345678" (8 chars): PASS
  Valid password "MyP@ssw0rd!" (11 chars): PASS
  Valid password "abcdefgh" (8 chars): PASS
  Invalid password "short" (5 chars): PASS
  Invalid password "1234567" (7 chars): PASS
  Invalid empty password: PASS
  Invalid password "abc" (3 chars): PASS

Test 3: Password Hashing
  Hash is not empty: PASS
  Hash is different from password: PASS
  Hash starts with $2y$ (bcrypt): PASS
  Hash length > 50 characters: PASS
  Sample hash: $2y$12$aEfP0ZzQfIV.nLt6VfyliOziIBFl6pdqz...

Test 4: Password Verification
  Verify correct password: PASS
  Reject wrong password: PASS
  Reject empty password: PASS

Test 5: Password Hash Uniqueness
  Same password produces different hashes (salt): PASS
  Both hashes verify correctly: PASS

Test 6: Additional Validator Methods
  Required field validation - non-empty string: PASS
  Required field validation - empty string: PASS
  Required field validation - whitespace only: PASS
  Phone number validation - valid: PASS
  Phone number validation - with spaces: PASS
  Phone number validation - with dashes: PASS
  Phone number validation - international: PASS
  Phone number validation - too short: PASS
  String length validation - within range: PASS
  String length validation - too short: PASS
  String length validation - too long: PASS

Test 7: Input Sanitization
  XSS script tags are escaped: PASS
  Sanitized output contains <: PASS
  Sanitized output does not contain <script>: PASS
  Original: <script>alert("XSS")</script>
  Sanitized: &lt;script&gt;alert(&quot;XSS&quot;)&lt;/script&gt;

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Test Summary:
  PASSED: 39
  FAILED: 0
  TOTAL: 39

✓ All tests passed!