Functional Testing

Functional tests focus on the business requirements of an application. They only verify the output of an action and do not check the intermediate states of the system when performing that action.

• Mainline functions: Testing the main functions of an application
• Basic Usability: It involves basic usability testing of the system. It checks whether a user can freely navigate through the screens without any difficulties.
• Accessibility: Checks the accessibility of the system for the user
• Error Conditions: Usage of testing techniques to check for error conditions. It checks whether suitable error messages are displayed.

There is sometimes confusion between integration tests and functional tests as they both require multiple components to interact with each other. The difference is that an integration test may simply verify that you can query the database while a functional test would expect to get a specific value from the database as defined by the product requirements.