'Test the _write_anchor() method'

def test_write_anchor(self):

    self.vml._write_anchor([2, 0, 15, 10, 4, 4, 15, 4])
    exp = '<x:Anchor>2,    15,    0,    10,    4,    15,    4,    4</x:Anchor>'
    got = self.fh.getvalue()
    self.assertEqual(got, exp)
