AutoFixture 세미나(6/10/2015) '단위 테스트' 세션 슬라이드

1. Unit Testing
이규원
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2. “Know the rules well, so you can break them effectively.”
- Dalai Lama XIV

3. Automated Testing

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

6. Costs
Manual(Quality Assurance) Automated
>

7. Reliability
Manual(Quality Assurance) Automated
<

8. Arrange
Act
Assert
Cleanup

9. DEMO
Automated UI Testing

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

24. DEMO
Stubs and Mocks

25. Myth Busting for
Test-Driven Development

26. Automated testing
TDD

27. Automated testing with high coverage
TDD

28. Writing the tests first
TDD
?

29. Test-Driven Development

30. Test-Driven Development

31. Test
Development

32. TESTS
MAKETH
CODE

33. Red
GreenRefactor

34. Write production code
If the test
fails
If all tests
succeed
Clean up code
Write a test
yes
yes
no
no
repeat

35. DEMO
Test-Driven Development