Testing external code

The main objective of testing is to be able to check code that's out of the boundaries of the test files. We can import code easily in the tests, and then verify whether it is working as expected. Let's see how to do it.

Getting ready

We will use the pytest module. We should install the module, adding it to our requirements.txt file as follows:

$ echo "pytest==5.4.1" >> requirements.txt
$ pip install -r requirements.txt

We will use the test files tests/test_external.py and code/external.py. You can download them from the GitHub repository at https://github.com/PacktPublishing/Python-Automation-Cookbook-Second-Edition/tree/master/Chapter12, under the subdirectories tests and code.

The tree should look like this:

├── code
│   ├── __init__.py
│   └── external.py
├── conftest.py
└─&...