問題描述

我剛剛發(fā)現(xiàn)一堆單元測試失敗了，因?yàn)殚_發(fā)人員沒有在測試中模擬出對 redis 客戶端的依賴.我正在努力解決這個(gè)問題，但我自己也遇到了困難.

I just found that a bunch of unit tests are failing, due a developer hasn't mocked out the dependency to a redis client within the test. I'm trying to give a hand in this matter but have difficulties myself.

該方法寫入一個(gè)redis客戶端:

The method writes to a redis client:

redis_client = get_redis_client()
redis_client.set('temp-facility-data', cPickle.dumps(df))

稍后在斷言中檢索結(jié)果:

Later in the assert the result is retrieved:

res = cPickle.loads(get_redis_client().get('temp-facility-data'))
expected = pd.Series([set([1, 2, 3, 4, 5])], index=[1])
assert_series_equal(res.variation_pks, expected)

我成功地修補(bǔ)了redis客戶端的get()和set().

I managed to patch the redis client's get() and set() successfully.

@mock.patch('redis.StrictRedis.get')
@mock.patch('redis.StrictRedis.set')
def test_identical(self, mock_redis_set, mock_redis_get):
    mock_redis_get.return_value = ???
    f2 = deepcopy(self.f)
    f3 = deepcopy(self.f)
    f2.pk = 2
    f3.pk = 3
    self.one_row(f2, f3)

但我不知道如何將 get() 的 return_value 設(shè)置為 set() 將在代碼中設(shè)置的值，以便測試通過.

but I don't know how to set the return_value of get() to what the set() would set in the code, so that the test would pass.

現(xiàn)在這條線沒有通過測試:

Right now this line fails the test:

res = cPickle.loads(get_redis_client().get('temp-facility-data'))
TypeError: must be string, not MagicMock

有什么建議嗎?

推薦答案

認(rèn)為你可以使用副作用在本地字典中設(shè)置和獲取值

Think you can use side effect to set and get value in a local dict

data = {}
def set(key, val):
    data[key] = val

def get(key):
    return data[key]

mock_redis_set.side_effect = set
mock_redis_get.side_effect = get

未對此進(jìn)行測試，但我認(rèn)為它應(yīng)該可以滿足您的需求

not tested this but I think it should do what you want

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