Unit Testing with Python
Download as PPTX, PDF•4 likes•3,228 views
This document discusses Python unit testing using the unittest framework and Nose. It covers key concepts such as test-driven development, writing test cases, using assert functions, and the structure of test classes. The document provides examples of setup and teardown methods and demonstrates how to run tests effectively.
Unit Testing with Python
- 1. Python Unit Testing By MicroPyramid
- 3. Why Software testing is important? To point out the defects during the development phases. To Ensure that the application works as expected.
- 4. Test Driven Development. The process of implementing code by writing your tests first, seeing them fail, then writing the code to make the tests pass. ● Write Tests ● Make Them fail ● Write code. ● Make them pass ● Repeat
- 5. Python Unit test Some Important Points ● Every test class must be sub class of unittest.TestCase ● Every test function should start with test name. ● to check for an expected result use assert functions. ● The setUp() method define instructions that will be executed before test case. ● The tearDown() method define instructions that will be executed after test case. ● Run Test with python -m unittest -v test_module ● Only test single part of code
- 7. Let’s start # tests/mul.py def multiply(a, b): return a*b def add(a, b): return a+b
- 8. Test case import unittest from mul import multiply class MultiplyTestCase(unittest.TestCase): def test_multiplication_with_correct_values(self): self.assertEqual(multiply(5, 5), 25) if __name__ == '__main__': unittest.main()
- 9. SetUp() and TearDown() class MulTestCase(unittest.TestCase): def setUp(self): # Runs before every test method self.a = 10 self.b = 20 def test_mult_with_correct_values(self): self.assertEqual(multiply(self.a, self.b), 200) def tearDown(self): # runs after every test method del self.a del self.b if __name__ == '__main__': unittest.main()
- 10. Assert functions ● assertEqual(a, b) ● assertNotEqual(a, b) ● assertTrue(x) ● assertFalse(x) ● assertIs(a, b) ● https://docs.python.org/2/library/unittest.html#test-cases
- 11. Nose: $ pip install nose # Running tests $ nosetests
- 12. Doc Tests: # tests/mul_dc.py def multiply(a, b): """ >>> multiply(4, 3) 12 """ return a * b # running $ python -m doctest -v file_name
- 13. Questions?