Unit Tests in Python | Python Tutorial | Unit Testing Your Code in Python

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py.test is an alternative, more Pythonic way of writing your tests. The pytest framework makes it easy to write small tests, yet scales to support complex functional testing for applications and libraries.
pytest is a mature full-featured Python testing tool that helps you write better programs. Learn Pytest basic functionality | Setup & Tear Down | Fixtures
Beginning with a brief introduction and setup of Pytest. We will see How to install pytest, Using Options with Pytest, Parameterizing tests (pytest.mark.parametrize), pytest fixtures + setup/teardown methods, Using PyCharm to run pytest tests. The best part is, the overhead for creating unit tests is close to zero!
How to use Options with pytest: How to run cases? • pytest tests/test_mod.py
• pytest tests/ • pytest -k match # def test_match(): -k EXPRESSION only run tests which match the given substring expression. • pytest –showlocals # trace context • pytest -x # stop on first failure case • pytest –maxfail=2 # on the second • pytest -s # enable `print` output • pytest –durations=5 # list top 5 slowest cases
• pytest –tb=long # default traceback • pytest –tb=line # oneline • pytest –tb=short • pytest –tb=native # Python default traceback
-m MARKEXPR only run tests matching given mark expression.
example: -m 'mark1 and not mark2'. –markers show markers (builtin, plugin and per-project ones). -x, –exitfirst exit instantly on first error or failed test. –maxfail=num exit after first num failures or errors. What is Unit Testing – According to wikipedia, unit testing is a software testing method by which individual units of source code are tested to determine whether they are fit for use. Why Unit Test? – Tests Reduce Bugs in New Features and Existing Features
Tests Are Good Documentation
Tests Reduce the Cost of Change
Faster Debugging
Faster Development
Better Design Python Testing frameworks
unittest – In the Python Standard Library
nose – Not in the Standard Library. Simpler tests than unittest
pytest – Not in the Python Standard Library. run with following command:
pytest test_math_func.py -v
or
py.test #PythonTutorialforBeginners #ProgrammingKnowledge #PyTest #PythonCourse.
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