Difference between revisions of "Writing unit tests"

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Information on writing unit tests, from the Internet:
Information on writing unit tests, from the Internet:


== Key Concepts ==
* Smallest testable unit
* Test Cases
* Test Discovery
* Test Coverage
* Test Driven Development / [http://pythontesting.net/agile/test-first-programming/ Test First Programming] / Test First Development
* Turning bugs into test cases
* Integration Testing / Test on commit




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* Use [https://docs.pytest.org/en/latest/ pytest] for Python unit tests. It's the best developed test framework, and widely supported.
* Use [https://docs.pytest.org/en/latest/ pytest] for Python unit tests. It's the best developed test framework, and widely supported.
* [http://pythontesting.net/framework/pytest/pytest-introduction/ Introduction to pytest], by Brian Okken, who wrote the book [https://pragprog.com/book/bopytest/python-testing-with-pytest "Python Testing with pytest"]
* [http://pythontesting.net/framework/pytest/pytest-introduction/ Introduction to pytest], by Brian Okken, who wrote the book [https://pragprog.com/book/bopytest/python-testing-with-pytest "Python Testing with pytest"]
* [http://pythontesting.net/start-here/ Brian Okken's python testing blog and podcast] (
* [http://pythontesting.net/start-here/ Brian Okken's python testing blog and podcast]  
* [http://agiletesting.blogspot.com/2005/01/python-unit-testing-part-3-pytest-tool.html 2005 article on Python unit testing with py.test]
* [http://agiletesting.blogspot.com/2005/01/python-unit-testing-part-3-pytest-tool.html 2005 article on Python unit testing with py.test]
* [https://semaphoreci.com/community/tutorials/testing-python-applications-with-pytest Tutorial on fixtures and unit-testing with semaphore]
* [https://www.tutorialspoint.com/unittest_framework/unittest_framework_py_test_module.htm TutorialsPoint on pytest]
* [https://stackoverflow.com/questions/tagged/py.test StackOverflow questions on py.test]


== Other collateral ==
== Other collateral ==
* [https://www.toptal.com/qa/how-to-write-testable-code-and-why-it-matters Excellent article on Toptal about writing unit tests],
* [https://www.toptal.com/qa/how-to-write-testable-code-and-why-it-matters Excellent article on Toptal about writing unit tests],

Latest revision as of 09:07, 25 April 2018

Information on writing unit tests, from the Internet:

Key Concepts

  • Smallest testable unit
  • Test Cases
  • Test Discovery
  • Test Coverage
  • Test Driven Development / Test First Programming / Test First Development
  • Turning bugs into test cases
  • Integration Testing / Test on commit


General Guidance

  • When you write a function, immediately write the test. (Or, better, write the test before you write the function).
  • If function A creates a data object and then calls function B, which does something to the data object and then calls function C, it may be difficult to generate a test for each function. This may indicate that you should refactor your program. For example, you may wish to create a new class, AA, which has different methods for different data functions. You can then write tests for each of these methods.

Testing Python with py.test

Other collateral