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Test Driven Development
Test Driven Development (TDD) is an Agile Software Development approach. It is based on the concept that you write a unit test first, and then write the code that will allow this test to pass. This means we are working iteratively to specify and build correct behaviour and also to create clean code with good structure.
With TDD, the unit test is written first with a test that fails, you then write the code that will execute and allow the unit test to pass. Overall TDD saves time spent performing unit tests and other similar tests since test creation is developed before the code has even been written.
Test Driven Development is essentially comprised of 4 steps:
- Write a test case that fails (Red)
- Write the code to satisfy the test case
- Run the test case again confirming test passes (Green)
- Refactor the code as per typical standards (Refactor)
These steps follow the principle of Red-Green-Refactor. For the Red-Green steps, make sure that you write the simplest code possible to solve the problem and when Refactoring, ensure that it follows Clean Code principles.
Each new feature of your system should follow the steps above.
More Information:
Agile Data's Introduction to TDD
Wikipedia on TDD
Martin Fowler Is TDD Dead? (A series of recorded conversations on the subject)
Kent Beck's book Test Driven Development by Example
Uncle Bob's The Cycles of TDD