Adding tests to an application

Creating tests before the production code

Collaborating with the Quality Control team

Implementing the code based on user test feedback 

Encourage you to think through your code design

Create a healthy development environment

Keep you focused

Validate code automatically

Maintain high standards

Create reports for managers 

First create a test that fails, then write production code to pass the test, then refactor both.

First create a production code, then write a test for it, then refactor both.

First create a production code and make sure it works without paying attention to the quality, then refactor to improve the quality.