Python Testing with pytest

Changing Test Discovery Rules

pytest finds tests to run based on certain test discovery rules. The standard test discovery rules are:

• Start at one or more directory. You can specify filenames or directory names on the command line. If you don’t specify anything, the current directory is used.

• Look in the directory and all subdirectories recursively for test modules.

• A test module is a file with a name that looks like test_*.py or *_test.py.

• Look in test modules for functions that start with test_.

• Look for classes that start with Test. Look for methods in those classes that start with test_ but don’t have an __init__ method.

These are the standard discovery rules; however, you can change them.

python_classes

The usual test discovery rule for ...