Hello, master Python programmers! In this module, we’ll switch gears and dive into the world of unit testing with Pytest. Testing is the coder’s safety net, ensuring that the lovely piece of software you’ve created functions as expected and saves us from potential downstream tragedies.Unit testing is a type of testing in which individual units of source code, such as functions or methods, are checked to see if they operate as expected. Python has various frameworks for unit testing, with Pytest being one of the most popular due to its straightforward, no-boilerplate approach. A test in Pytest is a function created in a Python file beginning with test_ that checks for a certain response to a given set of inputs. Pytest has a number of useful features, like assertion rewriting, parameterized testing, and sophisticated fixtures. In Pytest, a simple test might look like this:
def add(a, b):
return a + b
def test_add():
assert add(2, 3) == 5
You can then run the test using the pytest command:
pytest test_file. py
Exercise
Your mission, should you choose to accept, involves writing and running a simple unit test:- Write a Python function that performs a certain task (for instance, a function that subtracts two numbers).
- Write a Pytest unit test for this function.
- Run the unit test using the pytest command and make sure it passes.
Conclusion
Congratulations, code fighters! You’ve now taken your first steps into the world of unit testing. Remember that well-tested code is trustworthy, robust, and resilient. Continue to hone your testing skills because they will come in helpful when you begin working on larger and more complex projects. Continue testing and conquering the Python world!