[TIP] pytest

Bruno Oliveira nicoddemus at gmail.com
Fri Oct 14 11:50:35 PDT 2016

Hi James,

Thanks for posting the complete example.

There are some problems here, both general Python problems and some related
to how you are using pytest:

   1. testscript.py has no access to the A function because it doesn’t
   import it.
   2. You probably want to declare your fixture in a conftest.py file so
   pytest can make it available for all tests in your test suite.
   3. You have to first declare your option using the pytest_addoption hook.
   4. Since you intend to provide the value passed in the command line to
   the tests using a fixture, it is simpler to skip the test in the fixture

Here’s the full example with my suggestions:

# conftest.pyimport pytest
@pytest.fixture(scope='module')def a(request):
    value = request.config.getoption("A")
    if not value:
        pytest.skip('test needs -A option to run')
    return value
def pytest_addoption(parser):
    parser.addoption("--A", action="store", default=None, help="a option")
# testscript.pydef test_foo(a):
    assert a == '1'

Running it:

$ py.test testscript.py -q
1 skipped in 0.01 seconds

$ py.test testscript.py -q --A 1
1 passed in 0.01 seconds

$ py.test testscript.py -q --A 2
================================== FAILURES ===================================
__________________________________ test_foo ___________________________________

a = '2'

    def test_foo(a):
>       assert a == '1'
E       assert '2' == '1'
E         - 2
E         + 1

testscript.py:6: AssertionError
1 failed in 0.07 seconds

Hope that helps,

On Fri, Oct 14, 2016 at 3:07 PM James <bjlockie at lockie.ca> wrote:

Here is the exact code:
$ cat testconfig.py
import pytest

def A(request):
    return request.config.getoption("--A")

$ cat testscript.py
import pytest

skip_A = pytest.mark.skipif(
    reason="need --A option to run"

$ py.test testscript.py
============================= test session starts
platform linux2 -- Python 2.7.12, pytest-2.8.7, py-1.4.31, pluggy-0.3.1
rootdir: /home/rjl/pytest, inifile:
collected 0 items / 1 errors

==================================== ERRORS
________________________ ERROR collecting testscript.py
testscript.py:4: in <module>

E   NameError: name 'A' is not defined
=========================== 1 error in 0.01 seconds

Instead of doing
pytest.config.getoption more than one like this:
skip_A = pytest.mark.skipif( pytest.config.getoption("--A"), reason="need
--A option to run" )
I want to do it once in the config file.
I might want to use the value of the argument --A elsewhere so I don't want
to do getoption many times.

On 2016-10-14 01:16 PM, Bruno Oliveira wrote:


After fixing the missing “pytest” import, I get this error:

foo.py:8: in <module>
E   AttributeError: 'Config' object has no attribute 'request'

Please make sure to post a complete example and state clearly what your
problem is and what you are trying to accomplish.


On Fri, Oct 14, 2016 at 2:03 PM James <bjlockie at lockie.ca> wrote:

I have this in my config file:
def A(request):
    return request.config.getoption("--A")

skip_A = pytest.mark.skipif(
    reason="need --A option to run"

but when I run it, it says
E   NameError: name 'A' is not defined

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