def test_get_scaling_factor_with_value_passed():
# arrange
sf = 3.141592
# act
scaling_factor = eddy.get_scaling_factor(sf)
# assert
assert scaling_factor == sf
def test_get_scaling_factor_from_tkinter(mocker):
# arrange
mocker.patch("eddymc.eddy.simpledialog.askfloat", return_value=3.141592)
# act
scaling_factor = eddy.get_scaling_factor()
# assert
assert scaling_factor == 3.141592
def test_get_scaling_factor_with_value_passed_as_string():
# arrange
sf = '3.141592'
# act
scaling_factor = eddy.get_scaling_factor(sf)
# assert
assert scaling_factor == 3.141592
def test_get_scaling_factor_with_invalid_arg_passed():
# arrange
sf = 'parrot'
# act, assert
with pytest.raises(ValueError):
eddy.get_scaling_factor(sf)