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py.test seems to fail when I decorate test functions which has a fixture as an argument.
def deco(func): @functools.wraps(func) def wrapper(*args, **kwargs): return func(*args, **kwargs) return wrapper @pytest.fixture def x(): return 0 @deco def test_something(x): assert x == 0 In this simple example, I get the following error:
TypeError: test_something() takes exactly 1 argument (0 given). Is there a way to fix this, preferably without modifying the decorator too much? (Since the decorator is used outside testing code too.)
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pytest. fixture decorator makes it possible to inject the return value in the test functions whose have in their signature the decorated function name. Easy, isn't it? You can potentially generate and create everything you need in these fixture-functions and then use it in all the tests you need.
fixture decorator, described below. Pytest has useful built-in fixtures, listed here for reference: capfd. Capture, as text, output to file descriptors 1 and 2 .
usefixtures("fixture-name") . This special decorator adds the fixture to a test class, and the fixture will be executed before any test function.
It looks like functools.wraps does not do the job well enough, so it breaks py.test's introspection.
Creating the decorator using the decorator package seems to do the trick.
import decorator def deco(func): def wrapper(func, *args, **kwargs): return func(*args, **kwargs) return decorator.decorator(wrapper, func) Fixture feature depends on test function signature.
If you can change wrapper signature as follow, it will works.
def deco(func): @functools.wraps(func) def wrapper(x): return func(x) return wrapper If you can't change it, make another decorator:
def deco(func): @functools.wraps(func) def wrapper(*args, **kwargs): return func(*args, **kwargs) return wrapper def deco_x(func): @functools.wraps(func) def wrapper(x): return func(x) return wrapper And decorate test_somthing with deco_x:
@deco_x @deco def test_something(x): assert x == 0 If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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