Python Module unittest

External

• https://docs.python.org/3/library/unittest.html#module-unittest

Internal

• Python Language
• Python Testing

unittest vs. pytest

TODO: https://www.pythonpool.com/python-unittest-vs-pytest/

Concepts

Test Fixture

A test fixture represents the code needed to prepare the context for running one or more tests (create temporary databases, directories, etc.), and any associated cleanup actions.

Test Case

A test case is the individual unit of testing. In unittest, the test cases inherit from the base class TestCase.

Test Suite

A collection of test cases, test suites or both.

Test Runner

The test runner is the component that orchestrates the execution of tests and provides the outcomes to the user.

API

TestCase

A simple test case can be implemented by subclassing TestCase as shown below. The individual test methods are have names that start with test. This is a naming convention that informs the test runner about which methods to invoke as tests.

from unittest import TestCase

from my_code_to_test import some_function


class TestMyCode(TestCase):

    def test_empty(self):
        self.assertFalse(some_function(''))

    def test_lower_case(self):
        self.assertEqual('A', some_function('a'))

    def test_upper_case(self):
        self.assertEqual('A', some_function('A'))

    def test_exception(self):
        with self.assertRaises(ValueError):
            some_function('special')