Explain how testing of custom login form can be performed with the help of an example.

Testing a custom login form is crucial to ensure its functionality, security, and usability. Here’s how you can perform comprehensive testing using a structured approach:

1. Functional Testing:
   - Test Valid Inputs: Ensure that the form accepts valid credentials and grants access. For example, if the login form is for an application, use a test account with known valid credentials.
   - Test Invalid Inputs: Input incorrect usernames or passwords and verify that the form displays appropriate error messages and denies access. For instance, entering a wrong password should trigger a "Incorrect password" message.
   - Test Empty ___ ___ ________ ____ _____ _________ _____ ____.
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