Functional testing: Unit testing, integration testing and beyond

Q- Can functional testing be replaced or significantly reduced by integration testing? For example, by using a CI server?

A- Web Application that requires a login - Login page that requires an account name and password.

Unit test checks

• Field length of User & Password fields
• Enable and Disable Login button
• Password Character & Strongest

Integration test checks

• User views message after entering invalid details
• User views a home page after entering valid values and pressing the login button.

Here are a few more tests:

• Correct information stored in cookie as per previously visited on same PC
• How does having a cookie affect or not affect the login and home pages?
• Can a user that has been inactivated log in?
• Reset password functionality available if a user forgets their password
• Error message appears during entering invalid & no value in the field

Web Page is cached in browser during lost Internet connection and messaging appears on an attempt to login with connection.