如何模拟AWS调用获得我想要的回报？

Question

我创建了一个删除Amazon Machine映像的函数，如下所示：

def deleteImage(self, resourceInterface: boto3.resource, imageId: str):

        if (not(type(imageId) == str)):
            raise TypeError

        response = {
            'imageID': imageId,
            'returnCode': bool,
            'errorMessage': []
        }

        try:
            apiResponse = resourceInterface.Image(
                imageId).deregister(DryRun=self.dryRunEnabled)
            if (apiResponse['ResponseMetadata']['HTTPStatusCode'] == 200):
                response['returnCode'] = 0
            else:
                response['returnCode'] = 1
                response['errorMessage'] = apiResponse['ResponseMetadata']
        except Exception as err:
            response['returnCode'] = 1
            response['errorMessage'] = err.args

        return response

我的单元测试在这里：

    def test_deleteImage(self):
        imageId = 'ami-00992a771010f4653'
        imageLifecycle = Lifecycle(self.lifeCycleRules, self.dryRunEnabled)
        boto3 = MagicMock()
        ec2Resource = boto3.resource('ec2')
        ec2Resource.return_value = {
            'ResponseMetadata': {'HTTPHeaders': {'content-length': '231',
                                                 'content-type': 'text/xml;charset=UTF-8',
                                                 'date': 'Tue, 19 Nov 2019 21:42:55 GMT',
                                                 'server': 'AmazonEC2'},
                                 'HTTPStatusCode': 200,
                                 'RequestId': 'f6fb8bcc-68b0-4683-9cb7-75e9bf6ac669',
                                 'RetryAttempts': 0}
        }
        response = imageLifecycle.deleteImage(
            ec2Resource, imageId)
        self.assertEqual(response['returnCode'], 0)

这里发生的是将MagicMock对象分配给变量apiResponse，但是我想要的是分配return_value。

如何模拟boto3命令并将我想要的值返回给apiResponse？

apiResponse = resourceInterface.Image(imageId).deregister(DryRun=self.dryRunEnabled)