Python Unit Testing (original) (raw)

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In this section, you’ll learn about unit testing in Python by using the unittest modules to make your code more robust.

What you’ll learn: #

• Write effective test cases using the unittest module
• Run unit tests fast
• Skip tests unconditionally and conditionally
• Using test doubles including mocks, stubs, and fakes
• Parameterize tests
• Generate test coverage reports

Section 1. Introduction to unit testing in Python #

This section introduces you to the unit testing and the unittest module. After completing this section, you’ll know how to define and execute unit tests effectively.

• What is unit testing – introduce you to the unittest testing and how to use the unittest module to perform unit tests.
• Test fixtures – learn how to use test fixtures including setUp() and tearDown() to carry out the steps before and after test methods.
• Skipping tests – guide you on how to skip a test method or test class.
• Running unittest – show you various commands to run unit tests.

Section 2. assert methods #

This section covers the assert methods so that you know how to each of them more effectively.

• assert methods – introduce to you a brief overview of the assert methods of the TestCase class.
• assertEqual() – test if two values are equal.
• assertAlmostEqual() – test if two values are approximately equal.
• assertIs() – test if two objects are the same.
• assertIsInstance() – test if an object is an instance of a class or a tuple of classes.
• assertIsNone() – test if an expression is None.
• assertTrue() – test if an expression is True.
• assertIn() – test if a member is in a container.

Section 3. Test doubles #

This section introduces to you the test doubles to decouple the system under test code from the rest of the system so that code can be tested in isolation.

• Mock – learn how to use the Mock class to mimic behaviors of another function or class.
• patch() – show you how to use the patch() to temporarily replace an object with another object for testing.
• Stubs – show you how to use the MagicMock class & patch() to create stubs.
• Mocking requests module – learn how to mock the requests module to test an API call using the unittest module.

Section 4. Test coverage & Parameterized tests #

This section introduces you to the test coverage and how to define parameterized tests using the subTest() context manager.

• Generating test coverage reports – learn about test coverage and how to generate the test coverage report using the coverage module.
• Defining parameterized tests using subTest() – show you how to define parameterized tests using the unittest’s subTest() context manager.

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