Test Driven Development - TDD using Jest Framework

• Jest is a JavaScript Testing Framework
• Test Driven Development (TDD) is a software development practice that focuses on creating unit test cases before developing the actual code.
• The fundamentals are baby steps and unit tests.

Development cycle:

Red, Green, Refactor

• We wrote a Test that initially doesn't pass (Red),
• We added a new system functionality,
• We make the Test pass (Green),
• We refactored the code for the new functionality (Refactoring),
• We write the next Test;