Why does pycharm not recognize my pytest tests and show the test output?

Question

I'm new to pytest and am trying to write testing modules for my application. My directory structure is:

broker/
broker/tests
broker/tests/conftest.py
broker/tests/test_db.py
broker/db.py

I want to test the db.py module.

I configure pycharm to use pytest as my test runner. When I run the test_db.py in pycharm I get:

/Users/cbogdon/virtualenv/platinum-onboard/bin/python /Users/cbogdon/coding/platinum-onboard/broker/tests/test_db.py

Process finished with exit code 0

It's almost like pycharm is not executing the pytest. Even if I right click on the green arrow to the left of one of my testing functions a menu appears and shows I can click: "Run 'pytest for test_db.py::TestDBFunctions::test_valid_db'"

If I run it at the command line using:

python -m pytest --setup-show tests/test_db.py 

I get the appropriate test output.

 python -m pytest --setup-show tests/test_db.py 
========================================================== test session starts ===========================================================
platform darwin -- Python 3.6.1, pytest-4.1.1, py-1.7.0, pluggy-0.8.1
rootdir: /Users/cbogdon/coding/platinum-onboard/broker, inifile:
collected 4 items                                                                                                                        

tests/test_db.py 
        tests/test_db.py::TestDBFunctions::test_uuid.
        tests/test_db.py::TestDBFunctions::test_invalid_dbF
        tests/test_db.py::TestDBFunctions::test_valid_db.
        tests/test_db.py::TestDBFunctions::test_already_created_database.

================================================================ FAILURES ================================================================
____________________________________________________ TestDBFunctions.test_invalid_db _____________________________________________________

self = <test_db.TestDBFunctions object at 0x102606438>

    def test_invalid_db(self):
>       ret = db.initialize_database()
E       TypeError: initialize_database() missing 1 required positional argument: 'dbname'

tests/test_db.py:14: TypeError
=================================================== 1 failed, 3 passed in 0.08 seconds ==================================================

Is there something special I need to do in PyCharm?

Sorry for the newbie question, but I just can't figure this out one bit!

Answer 1

Please make sure that Settings > Tools > Python Integrated Tools > Default test runner is set to pytest & clean cache and restart pycharm (especially if this setting was changed in past)

(image courtesy of Brandon Braner)

Answer 2

If the other solutions don't work, make sure to set the content root correctly so that your code is properly indexed and tests can be detected. PyCharm -> Preferences -> Project -> Project Structure -> Add Content Root -> Select the root folder as content root.