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.

score 3 · Accepted Answer · edited May 23 '17 at 12:09

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 '17 at 12:09

Community

1
1

answered Apr 22 '17 at 08:44

The Compiler

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Laurent LAPORTE · Answer 2 · 2017-04-21T21:31:56.497

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 '17 at 21:31

answered Apr 21 '17 at 20:50

Laurent LAPORTE

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You can run pytest on a directory – Laurent LAPORTE Apr 21 '17 at 21:30
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. – Manavalan Gajapathy Apr 21 '17 at 21:40

score 0 · Answer 3 · answered Apr 21 '17 at 21:22

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 '17 at 21:22

marcinowski

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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. – Manavalan Gajapathy Apr 21 '17 at 21:42
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. – marcinowski Apr 21 '17 at 21:44
I am not sure if it's possible or not. Added an example now. Thanks! – Manavalan Gajapathy Apr 21 '17 at 22:16

Executing only tests using pytest without executing parent script

3 Answers3