[Python] 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.

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