Do you know your mock? - Madras JUG 20171028
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An important pillar of unit tests is the Mock Object, also known as Test Doubles. They come in many types and flavours. Together, we will name them and demonstrate them using EasyMock and Mockito. Source code: https://github.com/henri-tremblay/mocks
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Do you know your mock? - Madras JUG 20171028
- 1. © Henri Tremblay 2015 Henri Tremblay Senior Software Engineer Terracotta, a Software AG company Do you know your mocks? @henri_tremblay
- 2. 2 Authors: Tim Mackinnon, Steve Freeman, Philip Craig https://www2.ccs.neu.edu/research/demeter/related- work/extreme-programming/MockObjectsFinal.PDF Original Mock Object paper (2000)
- 3. 3
- 4. 4 Henri Tremblay • More or less made possible class mocking and proxying • Coined the term “partial mocking”
- 5. 5 Author: Robert C. Martin https://8thlight.com/blog/uncle- bob/2014/05/14/TheLittleMocker.html Uncle Bob mock classification (2014)
- 6. 6
- 7. 7 A class that you pass to something else when you don't care how it's used. Dummy
- 8. 8 A class that returns a valid answer but always the same one. Stub
- 9. 9 You use a spy when you want to be sure that the authorize method was called by the system. Spy
- 10. 10 A true mock is a mock that knows how to verify itself. True Mock
- 11. 11 A Fake has business behavior. You can drive a fake to behave in different ways by giving it different data. Fake
- 16. 16 Use as less mocks as possible
Editor's Notes
- He calls them Test doubles. From the most basic to the more advanced type of mock.
- I’m Henri Tremblay, I’m also the founder of the PerfUG in Paris. I am now one of the Montreal Jug leaders, so if you ever pass by, come say hello and present something. Finally, I’m also involved in Devoxx4kids Québec. Thank you very much for attending, I hope it was useful and I hope you had fun. My favourite question after a talk so I can know if I should keep doing it, is
- He calls them Test doubles. From the most basic to the more advanced type of mock.
- A true mock is a mock that knows how to verify itself. In fact, EasyMock and Mockito mocks are always true mocks. So their implementations of a true mock is the same as for the spy.
- About Ehcache, version 3 has been out for a while now. It is obviously faster, safer, nicer. Please have a look and give us feedback. This is the end, do you have any question?