Executing only tests using pytest without executing parent script

Question

How do I just run the tests without executing the parent script in py.test? Currently I run command pytest -v from directory Project_dir, and this runs script.py and tests finally in the end. Ideally only tests need to be run. Here is my current directory setup:

Project_dir
    script.py
    test
        test_script.py

script.py

def add(a,b):
    added = a + b
    return added

x = add(1,3)
print x, 'yup'

test_script.py

import script

def test_add():
    assert script.add(3,4) == 7

Working directory: Project_dir

Command: pytest -vs

========================================== test session starts ==========================================
platform darwin -- Python 2.7.10, pytest-3.0.7, py-1.4.33, pluggy-0.4.0 -- /usr/bin/python
cachedir: .cache
rootdir: **, inifile:
plugins: cov-2.4.0
collecting 0 items
Sum is 4
collected 1 items

test/test_script.py::test_add PASSED

======================================= 1 passed in 0.00 seconds ========================================

Sum is 4 shows the script.py executed fully instead of just the tests. It happens as the script.py is imported as module. But I keep thinking there must be a way to avoid this and just execute the tests directly.

Community · Accepted Answer · 2017-05-23 12:09:39Z

3

Importing a module in Python executes all top-level code in it.

You should have your code in a if __name__ == '__main__': so it only executes when you run your script (but not when you import it) - see e.g. this answer for details.

edited May 23, 2017 at 12:09

CommunityBot

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answered Apr 22, 2017 at 8:44

The Compiler

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Comments

marcinowski · Accepted Answer · 2017-04-21 21:22:44Z

0

How about running pytest test/? Just to make it clear: https://docs.pytest.org/en/latest/usage.html#specifying-tests-selecting-tests

pytest somepath      # run all tests below somepath

answered Apr 21, 2017 at 21:22

marcinowski

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3 Comments

Manavalan Gajapathy Over a year ago

Meaning pytest test_script.py for my example? It's not different (except for verbose) from pytest -v as pytest uses discovery rules to do the same thing.

marcinowski Over a year ago

So.. you want to test some script behaviour, without executing it? How do you test it then? :) I guess you should show us test_script.py and scripts.py if possible.

Manavalan Gajapathy Over a year ago

I am not sure if it's possible or not. Added an example now. Thanks!

Laurent LAPORTE · Accepted Answer · 2017-04-21 21:31:56Z

0

Try to Ignore paths during test collection

pytest -v --ignore=script.py

Or run pytest on a directory:

pytest -v test/

See Specifying tests / selecting tests

edited Apr 21, 2017 at 21:31

answered Apr 21, 2017 at 20:50

Laurent LAPORTE

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2 Comments

Laurent LAPORTE Over a year ago

You can run pytest on a directory

Manavalan Gajapathy Over a year ago

Still executes the main script. Not sure if pytest -v is any different from pytest -v test/ since we have only one test directory here. Just to be clear, main script gets executed when it is imported as module in the test script.

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