In Test First Design what step you will follow to add new functionality into the project?

When we have to add new functionality our project, we perform the following steps:

- Quickly add a developer test: we need to create a test that ensures that new added functionality will not crash our project.

- Run your tests. Execute that test, to ensure that new add functionality does not crash our application.

- Update your production code. In this we update our code with few more functionality so that the code passes the new test. Like adding of error message in field where field can take only numeric data.

- Run your test suite again. If test fails, we have to do change in the code and perform retesting of the application.