[Python] How to skip a pytest using an external fixture?

Background


I am running a py.test with a fixture in a conftest file. You can see the code below(this all works fine):

example_test.py

import pytest

@pytest.fixture
def platform():
return "ios"

@pytest.mark.skipif("platform == 'ios'")
def test_ios(platform):
if platform != 'ios':
raise Exception('not ios')

def test_android_external(platform_external):
if platform_external != 'android':
raise Exception('not android')


conftest.py

import pytest

@pytest.fixture
def platform_external():
return "android"

Problem


Now I want to be able to skip some tests that do not apply to my current test-run. In my example I am running tests either for iOS or Android (This is just for demonstration purposes only and could be any other expression).

Unfortunately I cannot get ahold of (my externally defined fixture) platform_external in the skipif statement. When I run the code below I receive the following exception: NameError: name 'platform_external' is not defined. I don't know if this is a py.test bug as locally defined fixtures are working.

add-on for example_test.py

@pytest.mark.skipif("platform_external == 'android'")
def test_android(platform_external):
"""This test will fail as 'platform_external' is not available in the decorator.
It is only available for the function parameter."""
if platform_external != 'android':
raise Exception('not android')


So I thought I will just create my own decorator, just to see that it won't receive the fixtures as parameters:

from functools import wraps

def platform_custom_decorator(func):
@wraps(func)
def func_wrapper(*args, **kwargs):
return func(*args, **kwargs)
return func_wrapper

@platform_custom_decorator
def test_android_2(platform_external):
"""This test will also fail as 'platform_external' will not be given to the
decorator."""
if platform_external != 'android':
raise Exception('not android')

Question


How can I define a fixture in a conftest file and use it to (conditionally) skip a test?

Continue reading...