'Testing Envelope equivalence.'

def test03_equivalence(self):

    e1 = Envelope(0.523, 0.217, 253.23, 523.69)
    e2 = Envelope((0.523, 0.217, 253.23, 523.69))
    self.assertEqual(e1, e2)
    self.assertEqual((0.523, 0.217, 253.23, 523.69), e1)
