我一直在尝试将单元测试添加到我的AWS脚本中。我一直在使用botocore.stub来存根API调用。
我需要为各种调用添加分页,我似乎无法找到一种方法来编写包含分页的测试。
以下是非分页测试的示例,我想知道如何重构此测试和函数以使用分页:
# -*- coding: utf-8 -*-
import unittest
import boto3
from botocore.stub import Stubber
from datetime import datetime
def describe_images(client, repository):
return client.describe_images(repositoryName=repository)
class TestCase(unittest.TestCase):
def setUp(self):
self.client = boto3.client('ecr')
def test_describe_images(self):
describe_images_response = {
'imageDetails': [
{
'registryId': 'string',
'repositoryName': 'string',
'imageDigest': 'string',
'imageTags': [
'string',
],
'imageSizeInBytes': 123,
'imagePushedAt': datetime(2015, 1, 1)
},
],
'nextToken': 'string'
}
stubber = Stubber(self.client)
expected_params = {'repositoryName': 'repo_name'}
stubber.add_response(
'describe_images',
describe_images_response,
expected_params
)
with stubber:
response = describe_images(self.client, 'repo_name')
self.assertEqual(describe_images_response, response)
if __name__ == '__main__':
unittest.main()
如果我更新函数以包含这样的分页:
def describe_images(client, repository):
paginator = client.get_paginator('describe_images')
response_iterator = paginator.paginate(
repositoryName=repository
)
return response_iterator
我们似乎正在某个地方。测试失败,因为它应该在平等发生变化时失败:
F
======================================================================
FAIL: test_describe_images (__main__.TestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
File "desc_imgs_paginated.py", line 47, in test_describe_images
self.assertEqual(describe_images_response, response)
AssertionError: {'imageDetails': [{'registryId': 'string'[178 chars]ing'} != <botocore.paginate.PageIterator object at 0x1058649b0>
----------------------------------------------------------------------
Ran 1 test in 0.075s
FAILED (failures=1)
当我尝试迭代生成器::
时def describe_images(client, repository):
paginator = client.get_paginator('describe_images')
response_iterator = paginator.paginate(
repositoryName=repository
)
return [r for r in response_iterator]
我收到以下错误:
E
======================================================================
ERROR: test_describe_images (__main__.TestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
File "desc_imgs_paginated.py", line 45, in test_describe_images
response = describe_images(self.client, repo_name)
File "desc_imgs_paginated.py", line 14, in describe_images
return '.join([r for r in response_iterator])
File "desc_imgs_paginated.py", line 14, in <listcomp>
return '.join([r for r in response_iterator])
File "lib/python3.6/site-packages/botocore/paginate.py", line 255, in __iter__
response = self._make_request(current_kwargs)
File "lib/python3.6/site-packages/botocore/paginate.py", line 332, in _make_request
return self._method(**current_kwargs)
File "lib/python3.6/site-packages/botocore/client.py", line 312, in _api_call
return self._make_api_call(operation_name, kwargs)
File "lib/python3.6/site-packages/botocore/client.py", line 579, in _make_api_call
api_params, operation_model, context=request_context)
File "lib/python3.6/site-packages/botocore/client.py", line 631, in _convert_to_request_dict
params=api_params, model=operation_model, context=context)
File "lib/python3.6/site-packages/botocore/hooks.py", line 227, in emit
return self._emit(event_name, kwargs)
File "lib/python3.6/site-packages/botocore/hooks.py", line 210, in _emit
response = handler(**kwargs)
File "lib/python3.6/site-packages/botocore/stub.py", line 337, in _assert_expected_params
self._assert_expected_call_order(model, params)
File "lib/python3.6/site-packages/botocore/stub.py", line 323, in _assert_expected_call_order
pformat(params)))
botocore.exceptions.StubResponseError: Error getting response stub for operation DescribeImages: Unexpected API Call: called with parameters:
{nextToken: string, repositoryName: repo_name}
----------------------------------------------------------------------
Ran 1 test in 0.051s
FAILED (errors=1)
我错过了正确的测试方法吗?或者这是boto3 / botocore中的错误?
答案 0 :(得分:0)
问这个问题已经有一段时间了,但因为没有答案..
在您的设置中,您提供如下响应字典
describe_images_response = {
'imageDetails': [
{
'registryId': 'string',
'repositoryName': 'string',
'imageDigest': 'string',
'imageTags': [
'string',
],
'imageSizeInBytes': 123,
'imagePushedAt': datetime(2015, 1, 1)
},
],
'nextToken': 'string'
}
这里的关键是第一个响应将包含一个 nextToken
值。这将导致来自分页器的第二个请求。因此,您必须为存根提供额外的响应,最终您需要以不包含 nextToken
现在回头看看你的设置,只有一个 add_response
调用 stubber
stubber.add_response(
'describe_images',
describe_images_response,
expected_params
)
最终结果是当分页器发出第二个请求时,设置中没有指定响应。
这导致异常,希望现在更有意义的消息
botocore.exceptions.StubResponseError: Error getting response stub for operation DescribeImages: Unexpected API Call: called with parameters:
{nextToken: string, repositoryName: repo_name}
由于尚未设置第二个响应,因此您会收到意外请求的异常,在此请求中您可以看到 nextToken
参数的规范。