Multiple assertions in with pytest.raises

Question

I'm trying to test code where I want to test multiple rules within a single with pytest.raises(ValueError) exception, is there a Pythonic way to do this? In the example below, I want to test that all 4 function calls will throw the value error.

With pytest.raises(ValueError):
  function_that_throws_exception(param1)
  function_that_throws_exception(param2)
  function_that_throws_exception(param3)
  function_that_throws_exception(param4)

Answer 1

I'd suggest to use parametrize :

@pytest.mark.parametrize("param", [param1, param2...])
def test_function_that_throws_exception(param):
    with pytest.raises(ValueError):
       function_that_throws_exception(param)

Answer 2

You could do something like:

params_that_should_throw = [param1, param2, param3, param4]

for param in params_that_should_throw:
    with pytest.raises(ValueError):
       function_that_throws_exception(param)