[WIP] add test for AerodynamicSurface

[CassianoMontibeller]

No description provided.

[rafaellehmkuhl]

It took me a while, but I've found a solution to our problem:

def test_get_lift(mocker, aerodynamic_surface):
    mock_area = mocker.PropertyMock(return_value=2.1)
    AerodynamicSurface.area = mock_area

    mock_aerodynamic_center = mocker.PropertyMock(
        return_value=Vector2(-0.2, 0))
    AerodynamicSurface.aerodynamic_center = mock_aerodynamic_center

    lift_vector, lift_point = aerodynamic_surface.get_lift()

    print(lift_vector)
    print(lift_point)

    assert(lift_vector.x == -1)
    assert(lift_vector.y == -1)
    assert(lift_point.x == -1)
    assert(lift_point.y == -1)

Notice the mocker attribute passed on the test function and the mocker.PropertyMock we are using both the area and the aerodynamic_center properties. Mock means "imitar". What those special functions do is to allow us to "imitar" a function/property with another, for testing purposes.

The above code is fully functional. You can use it. Remember to fix the asserts and remove the prints.

[rafaellehmkuhl]

@joaofoes take a look at my previous comment. You will need it when implementing tests for the Motor class, which is also an abstract class with some non-implemented methods.