Automation testing is a software testing strategy in which a tester programmatically runs the tests using a tool or a framework instead of manually going through the test cases and executing them one by one.

1. Unit tests: These are written by software developers and test a unit of code in isolation.
2. Integration tests: These test how well different software components work with each other.
3. Regression tests: Verify that the new code didn’t break any existing functionality.
4. Performance tests: Ensure that the software won’t crash and perform reasonably under heavy load or stringent conditions.
5. UI tests: Ensure that the software uses a consistent user experience and no visual or graphical elements on the screen are broken.

A test is a good candidate for automation under the following conditions.

• The test is repeatable.
• The feature under the test doesn’t change its behavior frequently.
• It’s time-consuming for a human tester.
• The test involves complicated calculations.
• The test ensures the previous functionality didn’t break after a new change.