TDD - A Reminder of the Principles
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This document discusses the principles of test-driven development (TDD). It explains that TDD involves specifying an application programming interface (API) through tests before implementing it to prove correctness. The core cycle of TDD is described as red-green-refactor, where tests are written (red), made to pass (green), and code is refactored for maintainability. Common structures for unit tests, advantages of TDD, and heuristics for the process are also outlined, along with examples of coding katas and how to set up a project and run unit tests.
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TDD - A Reminder of the Principles
- 1. TDD A reminder of the principles Matthias Noback @matthiasnoback
- 2. APPLICATION PROGRAMMING INTERFACE (API) How you can work with an object Create Modify Inspect
- 3. TEST-DRIVEN DEVELOPMENT (TDD) Specify the API (D = Design?) Implement it Prove its correctness
- 4. THE CYCLE OF TDD Red - Green - Refactor Red: create a failing test Green: make the test pass Refactor: make the code maintainable
- 5. STRUCTURE OF A UNIT TEST Arrange - Act - Assert Arrange: prepare some data Act: call some method Assert: verify the result
- 6. ADVANTAGES OF TDD The code you write is correct (provable, automated) The code you write is all the code you need You can safely refactor the code
- 7. HEURISTICS FOR TDD If you don't know what to do anymore Think of the simplest thing to test Think of the simplest way to make the test pass Think of edge cases (but not for too long) Think of how you would like to be able to use the object
- 8. KATA A short programming/TDD exercise
- 10. GO! Work together if you like Share what you've got
- 11. HOW TO SET UP A PROJECT? And run unit tests?