What are Unit Tests Python Tutorial | Python Tutorial Clips | MLittleProgramming

What are Unit Tests Python Tutorial

So what is a unit test. A unit test checks whether individual components in a system are performing as we expect them to. the components we will be looking at in this video are functions. Unit tests usually have an input into the component we are testing and an expectation of what the output should be.

There are 4 types of testing: integration testing, system testing, acceptance testing and unit testing. Unit testing is the first level of software testing and is performed before integration testing.
So why would we use unit testing? Unit testing increases confidence in changing code. If good unit tests are written and run by developers when code is changed, we can easily see any functionality regression due to the change we are making.

Unit testing, forces code to be written in a modular way. Modular coding tends to make code easier to reuse.

Unit testing makes the cost of fixing problems cheaper. If we change the functionality of our program and find the change has caused a test to fail then we can easily make a change. However if we don’t catch the error through our testing phases and it gets to live potentially you can see how that may cost a company a lot of money to fix and a few angry customers.

Now onto a few tips for when you're writing unit tests.

The first is that you want to Use test data that is close to what occurs in production. For example if you have a function that takes strings as input. If in the running of the system that function takes strings that always contain underscores in your test you want to be testing for strings that contain underscore not just single word strings like ‘hello’

Secondly use a version control system like GitHub so you can track your unit tests over time. This is so that if a bug reaches your live system you can see how your tests may have regressed over time and allowed the bug to pass through.

Finally run your unit tests frequently to make sure no errors are occurring. The more frequently you run your tests the more opportunity they have to catch errors.

In this video we will look at:
Unit Testing in Python
Where unit tests fit into the testing process
Benefits of Unit Testing
Tips for Writing Unit Tests

We will be looking at What are Unit Tests Python Tutorial in PyCharm.

Link to Python for Beginners Course: https://www.youtube.com/playlist?list=PLatthL1bYB1ozYN01I2wvML3mV5zFpNCQ
Python Functions Video: https://youtu.be/cAnqwOjvFA0
Previous Video: https://youtu.be/XNXeaXNmtP0

Link to download PyCharm: https://www.jetbrains.com/pycharm/download/

MLittleProgramming provides Python tutorials for software developers. The tutorials are sequential so you can start right from the beginning to learn Python if you are a beginner. If you're a little more advanced you can skip along a few videos in the Python tutorial series to get the Python knowledge you need.

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