Regression Testing

Regression Testing:

• Regression testing is a software testing practice that ensures an application still functions as expected after any code changes, updates, or improvements. Regression testing is the final step, as it verifies the product behaviors as a whole.
• Regression testing verifies that recent code changes haven't altered or destroyed the already existing functionality of a system. Regression testing examples include iteration regression and full regression, and both can be covered with manual and automated test cases.

Regression test can be done by:

• A test case which has frequent defects.
• Functionalities which are more visible to users.
• Test cases verify the core features of the product.
• All integration test cases.
• All complex test cases.
• Boundary value test cases.
• A sample of successful test cases.
• Failure of test cases.

Advantages:

• It ensures that the fixed bugs and issues do not reoccur. 
• This type of testing verifies that the modifications do not impact the correct work of the already tested code and detects any side effects.