Python unit testing
- 1. D. C. Sherman A UnitTesting FrameworkA UnitTesting Framework for Pythonfor Python
- 2. Traditional approach: Plan out the tests on paper Manually conduct the tests If there is a failure, fix the code and repeat the tests How to test your code?How to test your code?
- 3. Before writing any Python code you first write an automated test, with particular focus on the correct input and output for your code. At this stage you are not concerned with how you implement your code. Run your test and let it fail.This is OK, as you have yet to implement your algorithm. Begin coding your algorithm. Run the test again: if it fails, revise the code. Once the code passes the test, move onto the next algorithm. Test driven development (TDD)Test driven development (TDD)
- 4. Consider what the function should do Consider what inputs are required Consider what outputs are expected Planning your testPlanning your test
- 5. 1.import unittest 2.from Task_1 import * 3.class TestSequenceFunctions(unittest.TestCase): 4. deftest_rollDie(self): 5. maxNumOfSides= 20 6. for die in range(2, maxNumOfSides+1): 7. value = rollDie(die) 8. self.assertTrue(value >= 1) 9. self.assertTrue(value <= maxNumOfSides) Example Python unit testExample Python unit test
- 6. Steps to create a unit testSteps to create a unit test Create a new .pyfile for your test code Import the Python unittest library –import unittest Import your code to test –from <file name> import * Create a class for your tests by inheriting from unittest.TestCase –class <class name> (unittest.TestCase): Add one or more new test methods –def<method name>(self): Add assert statements to your method to notify the system of an error –self.assertEqual(<variable 1> , <variable 2>) –self.assertTrue(<condition> ) Run the test
- 7. assert methods available inassert methods available in Python’s unittest modulePython’s unittest module Method Checks that assertEqual(a,b) a == b assertNotEqual(a,b) a != b assertTrue(x) bool(x) is True assertFalse(x) bool(x) is False assertIn(a,b) a in b assertNotIn(a,b) a not in b If an assert method returns false, an error is logged and displayed in PyCharm Documentation: https://docs.python.org/3/library/unittest.html