使用假设测试 Python function 引发错误

Question

Is there a way to use Hypothesis to check if a Python function raises an Error when a particular set of arguments are passed to it? As in, I want the assert to be True if the function fails and not make the test execution stop and the function marked as having failed.

Answer 1

Yes, just as you would for a non-Hypothesis test, For example, you could use with pytest.raises(...): , or try: ... ; except: pass; else: raise AssertionError("did not raise error") try: ... ; except: pass; else: raise AssertionError("did not raise error") try: ... ; except: pass; else: raise AssertionError("did not raise error") .

If you mean that it is only expected to fail with an exact set of arguments, this seems like a case for traditional example-based tests; if you mean some arguments and not others I'd write a separate test for each case but you could get away with an if statement too.