Introduction to Unit Testing

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Gil Zilberfeld

Unit testing, mocking and TDD

Software

@gil_zilberfeld
Introduction to unit
testing

@gil_zilberfeld
Hello!
I AM GIL ZILBERFELD
www.gilzilberfeld.com
www.everydayunittesting.com
@gil_zilberfeld

@gil_zilberfeld
Brian
Marick’s
Testing
Quadrants

@gil_zilberfeld
Manual tests
Slow
Do not scale
Encourage forgetfulness
Immoral

@gil_zilberfeld
Automated tests
Run all the time
Don’t complain
Don’t forget

@gil_zilberfeld
The testing
pyramid
http://blogs.agilefaqs.com/2011/02/01/inverting-the-testing-pyramid/

@gil_zilberfeld
Why unit tests?
◉ Quick feedback
◉ Confidence to change your code
◉ Quicker than debugging
◉ Knowing your code works
◉ Low TCO
◉ Small setup overhead
◉ It’s not bugs if it’s caught before QA
◉ Go faster

@gil_zilberfeld
xUnit frameworks
Test identification
Execution and reporting
Asserts

@gil_zilberfeld
C++ xUnit frameworks
CppUnit
Boost Test
Catch
Google Test

@gil_zilberfeld
Java xUnit frameworks
JUnit
TestNG

@gil_zilberfeld
C# xUnit frameworks
NUnit
MSTest
xUnit

@gil_zilberfeld
javascript xUnit frameworks
QUnit
Jasmine
Mocha

@gil_zilberfeld
Demo
The humble lightsaber

@gil_zilberfeld
Make unit tests great again!
What makes them great?

@gil_zilberfeld
Quick
Readable
Focused
Deterministic
Independent
Self-cleaning
Great unit tests are…

@gil_zilberfeld
Refactoring
◉ Changing the form of the code without changing
the functionality
◉ Safer with tests
◉ But sometimes we need to refactor in order to
test

@gil_zilberfeld
Continuous integration
The mindset, not the tools

@gil_zilberfeld
Unit testing economics
What’s the ROI?

@gil_zilberfeld
Let’s get back to code
Legacy code, that is.

@gil_zilberfeld
Legacy code
◉ Contains all kind of dependencies
◉ Does all kinds of things together
◉ It’s ugly
◉ It’s fragile
◉ It’s rotting

@gil_zilberfeld
Legacy code
It’s hard to unit test

@gil_zilberfeld
Isolation and mocking
Manual
Frameworks
Simulators

@gil_zilberfeld
Mocking frameworks
◉ Test your code for different scenarios
◉ Fake the dependencies
◉ Change behavior of methods
◉ Assert method calls

@gil_zilberfeld
C/C++ mocking frameworks
Google Mock
Hippo Mocks
FFF
… and many more

@gil_zilberfeld
Java mocking frameworks
EasyMock
Mockito
Power Mockito
JMockIt

@gil_zilberfeld
C# mocking frameworks
Moq
FakeItEasy
Isolator

@gil_zilberfeld
javascript mocking frameworks
Sinon.js

@gil_zilberfeld
Unit testing advice
◉ Think ahead
◉ Make a test plan, not just for unit tests
◉ Test what you’re working on
◉ Unit testing is a team sport
◉ Coverage metrics

@gil_zilberfeld
Unit testing advice
◉ Quick feedback
◉ Organize your tests
◉ The cone of dependency
◉ Name like a detective
◉ Readability first

@gil_zilberfeld
Unit testing advice
◉ Test one thing
◉ Black box vs white box
◉ Test framework emergence

@gil_zilberfeld
Resources
◉ Michael Feathers
Working effectively with legacy code
◉ “Uncle Bob” Robert Martin
Clean code
The clean coder
◉ Kent Beck
Test driven development by example
Extreme programming explained

@gil_zilberfeld
Resources
◉ James Grenning
Test driven development for embedded C
◉ Martin Fowler
Refactoring: Improving the design of existing code
◉ James Shore
Let’s play TDD

@gil_zilberfeld
Thanks!
ANY QUESTIONS?
You can find me at:
@gil_zilberfeld
http://www.GilZilberfeld.com
http://www.EverydayUnitTesting.com

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Modern Unit Testing practices act as a conduit for improved software designs that are more amenable to change and can be easily backed by automation for fast feedback on quality assurance. The necessity of reducing external dependencies forces us to design our modules with minimum coupling which can then be leveraged both at the module, component and subsystem levels in our testing. As we start to integrate our units into larger blocks and interface our resulting components with external systems we find ourselves switching nomenclature as we progress from Unit to Integration testing. But is a change in mindset and tooling really required? The xUnit testing framework is commonly perceived as an aid to Unit Testing but the constraints that it imposes on the architecture mean that it is an excellent mechanism for invoking arbitrary code in a restricted context. Tests can be partitioned by categorisation at the test and fixture level and through physical packaging leading to a flexible test code structure. Throw in its huge popularity and you have a simplified learning curve for expressing more that just unit tests. Using scenarios from his current system Chris aims to show how you can use a similar format and tooling for unit, component and integration level tests; albeit with a few liberties taken to work around the inherent differences with each methodology.

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Introduction to Unit Testing

1. @gil_zilberfeld Introduction to unit testing

2. @gil_zilberfeld Hello! I AM GIL ZILBERFELD www.gilzilberfeld.com www.everydayunittesting.com @gil_zilberfeld

3. @gil_zilberfeld What is testing?

4. @gil_zilberfeld Brian Marick’s Testing Quadrants

5. @gil_zilberfeld Manual tests Slow Do not scale Encourage forgetfulness Immoral

6. @gil_zilberfeld Automated tests Run all the time Don’t complain Don’t forget

7. @gil_zilberfeld The testing pyramid http://blogs.agilefaqs.com/2011/02/01/inverting-the-testing-pyramid/

8. @gil_zilberfeld Why unit tests? ◉ Quick feedback ◉ Confidence to change your code ◉ Quicker than debugging ◉ Knowing your code works ◉ Low TCO ◉ Small setup overhead ◉ It’s not bugs if it’s caught before QA ◉ Go faster

9. @gil_zilberfeld xUnit frameworks Test identification Execution and reporting Asserts

10. @gil_zilberfeld C++ xUnit frameworks CppUnit Boost Test Catch Google Test

11. @gil_zilberfeld Java xUnit frameworks JUnit TestNG

12. @gil_zilberfeld C# xUnit frameworks NUnit MSTest xUnit

13. @gil_zilberfeld javascript xUnit frameworks QUnit Jasmine Mocha

14. @gil_zilberfeld Demo The humble lightsaber

15. @gil_zilberfeld Make unit tests great again! What makes them great?

16. @gil_zilberfeld Quick Readable Focused Deterministic Independent Self-cleaning Great unit tests are…

17. @gil_zilberfeld Refactoring What is it?

18. @gil_zilberfeld Refactoring ◉ Changing the form of the code without changing the functionality ◉ Safer with tests ◉ But sometimes we need to refactor in order to test

19. @gil_zilberfeld Continuous integration The mindset, not the tools

20. @gil_zilberfeld Unit testing economics What’s the ROI?

21. @gil_zilberfeld Let’s get back to code Legacy code, that is.

22. @gil_zilberfeld Legacy code ◉ Contains all kind of dependencies ◉ Does all kinds of things together ◉ It’s ugly ◉ It’s fragile ◉ It’s rotting

23. @gil_zilberfeld Legacy code It’s hard to unit test

24. @gil_zilberfeld Isolation and mocking Manual Frameworks Simulators

25. @gil_zilberfeld Mocking frameworks ◉ Test your code for different scenarios ◉ Fake the dependencies ◉ Change behavior of methods ◉ Assert method calls

26. @gil_zilberfeld C/C++ mocking frameworks Google Mock Hippo Mocks FFF … and many more

27. @gil_zilberfeld Java mocking frameworks EasyMock Mockito Power Mockito JMockIt

28. @gil_zilberfeld C# mocking frameworks Moq FakeItEasy Isolator

29. @gil_zilberfeld javascript mocking frameworks Sinon.js

30. @gil_zilberfeld Demo

31. @gil_zilberfeld Tips and tricks

32. @gil_zilberfeld Unit testing advice ◉ Think ahead ◉ Make a test plan, not just for unit tests ◉ Test what you’re working on ◉ Unit testing is a team sport ◉ Coverage metrics

33. @gil_zilberfeld Unit testing advice ◉ Quick feedback ◉ Organize your tests ◉ The cone of dependency ◉ Name like a detective ◉ Readability first

34. @gil_zilberfeld Unit testing advice ◉ Test one thing ◉ Black box vs white box ◉ Test framework emergence

35. @gil_zilberfeld Test Driven Development

36. @gil_zilberfeld Why test first?

37. @gil_zilberfeld Test driven development

38. @gil_zilberfeld Demo: TDD

39. @gil_zilberfeld Resources ◉ Michael Feathers Working effectively with legacy code ◉ “Uncle Bob” Robert Martin Clean code The clean coder ◉ Kent Beck Test driven development by example Extreme programming explained

40. @gil_zilberfeld Resources ◉ James Grenning Test driven development for embedded C ◉ Martin Fowler Refactoring: Improving the design of existing code ◉ James Shore Let’s play TDD

41. @gil_zilberfeld Thanks! ANY QUESTIONS? You can find me at: @gil_zilberfeld http://www.GilZilberfeld.com http://www.EverydayUnitTesting.com

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