'Check that we get the right key when there is a collision'

def test_collision(self):

    self.conf1.set('b', 3)
    self.conf2.set('a', 4)
    self.conf1.write()
    self.conf2.write()
    router = ConfigRouter([self.path1, self.path2])
    self.assertEqual(router.get('a'), 1)
    self.assertEqual(router.get('b'), 3)
