Pass dinamically command line option into a test body

[fontealpina]

Hi, in my use case I need to set dinamically a self attribute of a test class with a command line option, without passing explicitly the parameter to the test definition, with a plugin.
For example:

# content test.py 
class TestSuite():
     my_cmd_opt = 'foo'

     def test_case(self):
          assert self.my_cmd_opt != 'foo' # here the test should pass because self.my_cmd_opt
                                          # has been dinamically changed from pytest

so if i run:

   $> pytest --set-my-cmd-opt=alpha test.py
   test.py::TestSuite::test_case PASSED

because I've set self.my_cmd_opt to 'alpha' instead of 'foo'
There is a way to do that?

[nicoddemus]

Yes, please take a look at this section in the docs.

Based on the example, you can now access the option directly instead:

# content test.py 
class TestSuite():

     def test_case(self, my_cmd_opt):
          assert my_cmd_opt != 'foo'

But if you really want to set it as an attribute of the class, you can use an autouse-fixture in the class scope:

class TestSuite():
     my_cmd_opt = 'foo'

     @pytest.fixture(autouse=True)
     def setup_getopt(my_cmd_opt):
         self.my_cmd_opt = my_cmd_opt

     def test_case(self):
          assert self.my_cmd_opt != 'foo' 

Hope this helps. 🍻

[fontealpina]

Thanks! I tried your suggestion but I get an error:

     E       NameError: global name 'self' is not defined

Morover I was wondering if instead of use a fixture solution, there is a chance to do that directly from a

      def pytest_runtest_protocol(item):

Setting the attribute my_cmd_opt before the calling of

      reports = runtestprotocol(item)

There is a way to do something like this?

[nicoddemus]

Thanks! I tried your suggestion but I get an error:

Sorry:

     @pytest.fixture(autouse=True)
     def setup_getopt(self, my_cmd_opt):
         self.my_cmd_opt = my_cmd_opt

Morover I was wondering if instead of use a fixture solution, there is a chance to do that directly from

It is possible, you can access the config object using item.config in pytest_runtest_protocol, but IIMO this is too implicit... I would go with the fixture approach, it is simple and explicit.

[fontealpina]

Thanks! but in which of the item sub-object I need to set the attribute so that the test instance can see the command line option?

[RonnyPfannschmidt]

The fixture as shown by @nicoddemus is in the object itself, no need to mess around with items

[RonnyPfannschmidt]

Closing due to lack of feedback