'Check that the config router writes correctly to the filesystem'

def test_write(self):

    router = ConfigRouter([self.path1, self.path2])
    router.set('a', 3)
    router.set('b', 4)
    router.write()
    self.conf1.load()
    self.conf2.load()
    self.assertEqual(self.conf1.get('a'), 3)
    self.assertEqual(self.conf1.get('b'), None)
    self.assertEqual(self.conf2.get('b'), 4)
    self.assertEqual(self.conf2.get('a'), None)
