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Understanding Unit Testing
- 1. Understanding Unit Testing INTRODUCTION TOAUTOMATED TESTING AND UNIT TESTING
- 2. Introduction Ikhwan Hayat(a.k.a 1kHz) 9 years experience developing software Freelance Software Developer ikhwanhayat@gmail.com 2
- 3. manual 3 Testing? VS automated white box VS black box acceptancetest integration test unit test
- 4. Unit? 4 Unit testingis a method by which individual units of source code are tested to determine if they are fit for use. One can view a unit as the smallest testable part of an application. Unit tests are created by programmers or occasionally by white box testers during the development process.
- 5. TDD Test DrivenDesign It’s NOT testing, but using tests to DRIVE the design As a side-effect, you got unit tests! With good level of coverage! 5
- 6. 6 RED GREEN REFACTOR Write a failingtest. With empty class/method. Fill in the class/method implementation. Make the tests pass. Make code better.
- 7. Demo: Bank Account Requirements Can create bank accounts Can deposit money into account Can withdraw money from account Throw exception if balance is insufficient Can transfer money from one account to another Can insert and update accounts into database 7
- 8. 8 IDE / Platform http://www.microsoft.com/visualstudio/eng/pro ducts/visual-studio-express-for-web https://code.google.com/p/moq/ UnitTesting Framework Mocking Framework http://nunit.org/ Tools
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- 18. A good unittest is… Isolated/independent Test one thing at a time. Unit under test doesn’t depend on the other to make test runs. Repeatable Running multiple times yields the same result. Doesn’t rely on environment. Fast You want to repeat it again and again. You want it to be a pleasure to work with. Self-Documenting Test code and code under test clear and concise. Can be a reference for usage of your class/method/etc. 18
- 19. 19 Dependency Injection Separation ofInterface and Implementation Single Responsibility Principal
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- 21. 21 “Mocking” allow usto isolate dependent units.
- 22. Types of TestDoubles Dummy objects are passed around but never actually used. Usually they are just used to fill parameter lists. Fake objects actually have working implementations, but usually take some shortcut which makes them not suitable for production. Stub objects provide canned answers to calls made during the test, usually not responding at all to anything outside what's programmed in for the test. Mock objects are pre-programmed with expectations which form a specification of the calls they are expected to receive. 22
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- 24. Benefits Instant feedback Write test, write code, see instant result. Promote modularity in your design DI, SRP, Interface vs Implementation. Safety net Change/add code and check if business rules are still honored. Free documentation Can be a reference for usage of your class/method/etc. 24
- 25. Done! What isunit testing. TDD. How to write good unit tests. How unit testing can benefit us. 25 We have learned… Get the codes and slides at… https://github.com/ikhwanhayat/jomweb_unittest
- 26. Next? Learning BDD(Behavior Driven Design). Research CI (Continuous Integration). Learn on how to design testable systems. Use unit testing for your project! (I mean, seriously, USE IT!) 26 You can go on with…
- 27. MOAR! Google+ MyDev http://www.mydev.my/automated-testing- dalam-pembangunan-perisian.html ikhwanhayat@gmail.com 27 THANK YOU FOR LISTENING!