I have a function like so (it's actually a class, but that's not relevant given Python's duck typing): def myfunc(a=None, b=None): <snip> Now I want to write a Hypothesis test which always supplies a, but only sometimes b. I tried from hypothesis import given, strategies as strat @given(a=strat.booleans()) @given(b=strat.integers(min_value=1) | strat.nothing()) def test_model_properties(self, **kwargs): myval = myfunc(**kwargs) <snip> But it seems that when it gets strat.nothing() just skips that test run (I get hypothesis.errors.FailedHealthCheck: It looks like your strategy is filtering out a lot of data. when using that as the sole strategy for b). How can I only sometimes supply an argument with a Hypothesis test? Do I need to write two tests, one with b and one without? Continue reading...
