Unit testing
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Unit Testing document discusses automated testing, software regression, unit testing benefits like speed and reliability over manual testing. It covers arranging, acting and asserting in tests as well as continuous integration. Key points are test doubles can replace dependencies, inversion of control principles like dependency injection and interfaces. Demo shows stubs, mocks in tests and test-driven development process of writing tests first before code.
Unit testing
- 2. “Know the rules well, so you can break them effectively.” - Dalai Lama XIV
- 4. Software Regression “A software bug which makes a feature stop functioning as intended after a certain event” - Wikipedia
- 5. R1 R2 R3 R4 SOFTWARE Features
- 10. Continuous Integration “Many, including me, consider that CI without testing is not CI at all.” - The Architecture Journal, January 2008 by Munjal Budhabhatti Continuous Build Continuous Integration Automated Testing
- 11. Unit Tests
- 12. Horizontal Separation Layer D Layer C Layer B Layer A
- 13. Functional Testing(Vertical Separation) SystemUnderTest Layer D Layer C Layer B Layer A SystemUnderTest Layer D Layer C Layer B Layer A SystemUnderTest Layer D Layer C Layer B Layer A Function 1 Function 2 Function 3
- 14. *Integration Testing Layer D Layer C Layer B Layer A SystemUnderTest System Under Test System Under Test
- 15. Unit Testing Layer D Layer C Layer B Layer A System Under Test System Under Test System Under Test System Under Test
- 16. Unit Testing • Fast • Reliable • Isolate failures
- 17. Test Doubles Layer D Layer C Test Double for Layer B Layer A System Under Test
- 18. Inversion of Control “Don't call us, we'll call you.”
- 19. Dependency Inversion A Layer C depends on a Layer B A Layer C creates a Layer B A Layer C requests a Layer B
- 20. Constructor Injection public class LayerC { private LayerB _layerB; public LayerC() { _layerB = new LayerB(); } } public class LayerC { private LayerB _layerB; public LayerC(LayerB layerB) { _layerB = layerB; } } << created >> << injected >>
- 21. *Interface public interface ILayerB { } public class LayerB : ILayerB { } public class LayerC { private ILayerB _layerB; public LayerC(ILayerB layerB) { _layerB = layerB; } }
- 22. Test Double The replacement of a real depended-on component for testing purposes
- 23. Test Doubles Dummy Stubs Spies Mocks Fake Passed but never used Provide canned answers Record information Verify expectations Have working implementations but not suitable for production
- 25. Myth Busting for Test-Driven Development
- 27. Automated testing with high coverage TDD
- 28. Writing the tests first TDD ?
- 31. Test Development
- 34. Write production code If the test fails If all tests succeed Clean up code Write a test yes yes no no repeat