How to make python tests

Write Python tests w/ examples: learn how to use the unittest & pytest frameworks to write tests for your code & debug faster.

Creating a Python Test

Python testing is an important part of the development process, as it helps ensure the quality of your code. Writing tests can be a tricky task, as you need to make sure that your tests are comprehensive and that they cover all the possible scenarios your code may encounter. Here is an example of how to write a simple test case in Python.

The first step is to import the necessary modules. For this example, we will be using the unittest module, which is the standard library for writing unit tests in Python. We will also be using the math module to access some mathematical functions.

import unittest
import math

Next, we will create a class which will contain our test case. This class should extend the unittest.TestCase class, which provides a number of useful methods for writing tests.

class TestMathMethods(unittest.TestCase):
    pass

Now, we will write our first test method. This method should take two parameters, the expected result and the actual result. If the expected result is not equal to the actual result, then the test will fail. For this example, we will be testing the math.sqrt() function, which returns the square root of a number.

def test_sqrt(self, expected, actual):
    self.assertEqual(expected, math.sqrt(actual))

Finally, we need to add our test method to the class and execute it. We will use the addTest() method to add our test method to the class, and then call the run() method to execute the test.

test_case = TestMathMethods('test_sqrt')
test_case.addTest(test_sqrt, 4, 16)
test_case.run()

That's it! Our test is now ready to be run. With this simple example, we have seen how to write basic tests in Python, and how to ensure that our code is doing what we expect it to do. Unit testing is an important part of the development process and is essential for creating robust software.