'Test the function that does it all'

@pytest.mark.skipif(u'not    HAS_MATPLOTLIB')
def test_make_rgb(self):

    satValue = 1000.0
    with tempfile.NamedTemporaryFile(suffix=u'.png') as temp:
        red = saturate(self.image_r, satValue)
        green = saturate(self.image_g, satValue)
        blue = saturate(self.image_b, satValue)
        lupton_rgb.make_lupton_rgb(red, green, blue, self.min_, self.stretch_, self.Q, filename=temp)
        assert os.path.exists(temp.name)
