'Helper method for checks specific to color= input.'

def color_only_checks(self, p, rgb):

    p.circle([1, 2, 3], [1, 2, 3], color=rgb)
    self.assertTupleEqual(p.renderers[(-1)].glyph.line_color, rgb)
    self.assertTupleEqual(p.renderers[(-1)].glyph.fill_color, rgb)
    [self.assertIsInstance(v, int) for v in p.renderers[(-1)].glyph.line_color[0:3]]
    [self.assertIsInstance(v, int) for v in p.renderers[(-1)].glyph.fill_color[0:3]]
