["python","unit-testing","pytest"]
Why is PyTest not collecting tests (collected 0 items)?

I have been trying to run unit tests using pytest. I wrote a module with one class and some methods inside that class, and I wrote a unit test for this module (with a simple assert statement to check equality of lists) where I first instantiated the class with a list. Then I invoke a method on that object (from the class). Both test.py and the script to be tested are in the same folder. When I run pytest on it, it reports "collected 0 items". I am new to pytest and but I am unable to run their examples successfully. What am I missing here? I am running Python version 3.5.1 and pytest version 2.8.1 on Windows 7. My test.py code: from sort_algos import Sorts def integer_sort_test(): myobject1 = Sorts([-100, 10, -10]) assert myobject1.merge_sort() == [-101, -100, 10] sort_algos.py is a module containing Sorts class. merge_sort is a method from Sorts.
pytest gathers tests according to a naming convention. By default any file that is to contain tests must be named starting with test_, classes that hold tests must be named starting with Test, and any function in a file that should be treated as a test must also start with test_. If you rename your test file to test_sorts.py and rename the example function you provide above as test_integer_sort, then you will find it is automatically collected and executed. This test collecting behavior can be changed to suit your desires. Changing it will require learning about configuration in pytest.