def test_InertialObject_update__motionless_rotation():
sut = InertialObject(img=resources.chevron_image)
sut.rotation = 0.0
sut.rotation_speed = 0.0
sut.update(1.0)
assert sut.rotation == 0.0
def test_InertialObject_update__negative_rotation():
sut = InertialObject(img=resources.chevron_image)
sut.rotation = 0.0
sut.rotation_speed = -15.0
sut.update(1.0)
assert sut.rotation == 345.0
def test_InertialObject_update__rotation_partial_dt():
sut = InertialObject(img=resources.chevron_image)
sut.rotation = 0.0
sut.rotation_speed = -10.0
sut.update(0.5)
assert sut.rotation == 355.0