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This document discusses unit testing and provides definitions and best practices for writing unit tests. It defines a unit test as a test that runs quickly (less than 1/10th of a second) and focuses on a small part of the system to help localize failures. Good unit tests run fast, help improve quality, help understand the system under test, and reduce risk. The document recommends that unit tests be automatic, thorough, repeatable, independent, and professional. It also describes test doubles and gives examples of different types like dummies. Finally, it discusses sources of inspiration for writing unit tests and next steps.
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Keynote, Google Test Automation Conference. Hyderabad, India, October 28, 2010.
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Machine Learning presentation.
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Testing
- 2. % Copyright 2012 Bas Bossink bas.bossink@gmail.com. % See the file LICENSE for copying conditions.
- 3. Contents Introduction Definitions Inspiration Reality Where do we want to go? Next actions
- 4. Introduction Goal Common vocabulary Defining next actions About GFDL on github libre tools Sources Working Effectively with Legacy Code Micheal C. Feathers xUnit Test Patterns Gerard Meszaros Kata Casts Pragmatic Unit Testing in Java Andy Hunt, Dave Thomas
- 6. Definitions Unit test WELC : A test that runs in less than 1/10th of a second and is small enough to help you localize problems when it fails. XTP : A test that verifies the behavior of some small part of the overall system. wikipedia : In computer programming, unit testing is a method by which individual units of source code are tested to determine if they are fit for use. A unit is the smallest testable part of an application. Component Test : Component : More granular Self contained Clear responibillity (deployable) SUT : System Under Test
- 7. Good Unit Tests Run fast 6000 classes => 6000 test fixtures Avg. 3 test/fixture = 18.000 tests Acceptable runtime 2-3 min. => 0.01 s/test Help localize problems Help improve quality Help understand SUT Reduce (and not introduce) risk Are easy to run Are easy to write and maintain
- 10. Good Unit Tests are A TRIP Automatic Thorough Repeatable Independent Professional pragmatic unit testing summary card
- 11. It ain’t a Unit Test when It talks to a database It communicates across a network It touches the filesystem It starts other processes It starts other threads It calls Thread.Sleep(. . . )
- 12. Test Code Quality DRY DRY DRY DRY : don’t repeat yourself
- 13. Test Doubles Pattern Purpose Has Be- hav- ior Injects indi- rect in- puts into SUT Handles indirect outputs of SUT Values pro- vided by test(er) Examples Test Dou- ble Generic name for family Dummy Ob- ject Attribute or Method Parameter no no, never called no, never called no Null, “Ignored String”, new Object()
- 14. Inspiration Positive filter Watch flow, kadanz Code Kata by Robert C. Martin aka Uncle Bob ruby calculate the list of primes that divide of a given number Katacast Uncle Bob Prime Factors
- 15. Reality Happy medium Part of an interview with Billy Hollis for dotnetrocks Excerpt of Billy Hollis interview
- 16. Where do we want to go?
- 17. Next actions