Submit stub swallows arguments without raising an error

[jackjennings]

Writing a test with the test helper for the following test will pass, while executing the code in the controller will actually raise an exception:

class FooController
  def create
    submit FooForm, Foo.new, params, extra_argument
  end
end

class FooControllerTest
  def test_should_create
    assert_submits OrderForm, stub: order_double do
      post foos_url
    end
  end
end

The stub that replaces the submit method verifies that the first argument is the correct form, but not that the second and third arguments are present (and no more than that).

[jackjennings]

It would also be nice to have the error message be instructive about why the error is raised, and how to resolve it.