00:00 Welcome back to the Hundred Days of Python.

00:02 In the coming three days I will show you

00:04 how you can test the program with pytest.

00:06 It's a popular testing framework,

00:08 often preferred over the standard libraries unittest.

00:11 And you will see why.

00:13 For this lesson I prepared a guessing game,

00:15 which lets you guess a number from the command line.

00:18 And although is a simple program,

00:20 it has a lot to offer in showing how to use pytest,

00:24 for example to validate errors,

00:26 capture standard output,

00:28 mocking certain functionality, and more.

00:31 By writing the test, I will also show you

00:34 how you can use coverage, to see how much

00:37 of your code base, or in this case,

00:39 the script is covered by tests.

00:41 And by the end of this session,

00:42 it should be easy for you

00:44 to write tests for your code, an important skill.