New issue 719: pytest.mark.parametrize string-based parameter list doesn't
handle single element tuples
https://bitbucket.org/pytest-dev/pytest/issue/719/pytestmarkparametrize-string-based
David Haney:
When specifying a `@pytest.mark.parametrize` element composed of a one-element
tuple, I'm unable to use the string-based argument list, for example:
@pytest.mark.parametrize("arg", scenarios)
def test(arg):
print(arg)
assert(arg == "a") # this assert always fails
arg ends up being the tuple instead of the first item in the tuple (as I would
expected based on tuples with more than one item. I also tried:
@pytest.mark.parametrize("arg,", scenarios)
but that also associated the entire tuple with arg instead of the first
element. I reverted back to the older model of specifying the arguments as a
tuple:
@pytest.mark.parametrize("arg,", scenarios)
Finally I switched back to the older style of using a tuple to specify the
parameter list:
@pytest.mark.parametrize(("arg",), scenarios)
This version worked. This seems to imply that there is either a bug/limitation
in the new string-based parameter specification, or that there is still a
use-case for the tuple-based parameter specification. It would be helpful if
either the string-based implementation could be updated to handle this
situation, or if the documentation could be updated to note when the
tuple-based parameter specification is still needed.
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