Login & Authentication Test Cases
Authentication is often the first interaction users have with your application—and one of the most critical to get right. Proper test coverage ensures security without sacrificing user experience.
Core Login Test Cases
Every login feature needs these fundamental test cases:
- Valid login with correct email and password
- Login fails with incorrect password
- Login fails with unregistered email
- Login fails with empty email field
- Login fails with empty password field
- Remember me functionality persists session
- Logout clears session and redirects appropriately
Security-Focused Test Cases
Authentication is a prime target for attacks. Cover these security scenarios:
- Account lockout after multiple failed attempts
- Brute force protection triggers rate limiting
- SQL injection attempts are rejected
- XSS payloads in login fields are sanitized
- Session token regenerates after successful login
- Concurrent session handling (single vs. multiple devices)
Edge Cases to Consider
These scenarios often slip through the cracks:
- Login with email containing special characters
- Login with maximum length password
- Login attempt with expired session token
- Login on slow network connections
- Login after password reset
- Login with case variations in email
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