测试功能与Google App Engine`文件`api [英] test function with Google App Engine `files` api

问题描述

我有一个使用Google Blobstore API的函数，这里有一个退化的例子：
$ b

 ＃！/ usr / bin / python 
 from google.appengine.ext导入测试数据
 
 def foo（）：
 from google.appengine.api导入文件
 blob_filename = files.blobstore.create （mime_type ='text / plain'）
 with files.open（blob_filename，'a'）as googfile：
 googfile.write（测试数据）
 
文件。 finalize（blob_filename）
 
 tb = testbed.Testbed（）
 tb.activate（）
 tb.init_blobstore_stub（）
 
 foo（）＃in现实中，我是一个在unittest测试用例中从'虚拟客户'
＃调用的函数。 
  

产生的错误是：

 
 Traceback（最近一次调用最后一次）：
在
中的文件e.py，第18行foo（）＃实际上，我是一个函数，虚拟客户'
文件e.py，第8行，在foo 
 blob_filename = files.blobstore.create（mime_type ='text / plain'）
文件/ Applications / GoogleAppEngineLauncher。 app / Contents / Resources / GoogleAppEngine-default.bundle / Contents / Resources / google_appengine / google / appengine / api / files / blobstore.py，第68行，创建
返回files._create（_BLOBSTORE_FILESYSTEM，params = params ）
在_create $ b中的文件/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/files/file.py，第491行$ b _make_call（'Create'，request，response）
文件/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_ appengine / google / appengine / api / files / file.py，第230行，在_make_call 
 rpc = _create_rpc（截止日期=截止日期）
文件/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine -default.bundle / Contents / Resources / google_appengine / google / appengine / api / files / file.py，第213行，在_create_rpc 
返回apiproxy_stub_map.UserRPC（'file'，截止日期）
文件 /Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/apiproxy_stub_map.py，第393行，位于__init__ 
 self .__ rpc = CreateRPC（service ，stubmap）
在CreateRPC $ b中的第67行中的/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/apiproxy_stub_map.py文件$ b assert stub，'No api proxy found for service％s'％service 
 AssertionError：No api proxy found for servicefile
 

我不想修改 foo 以便测试它。有没有办法让Google App Engine的单元测试中的 foo 按预期工作（即创建给定的文件）？

我希望能够通过 Google的API代理，但我不明白这一点是否可以自行解决。

我很感激您的想法和建议。

感谢您的阅读。

看起来像 testbed.init_blobstore_stub（）已过期，因为 dev_appserver 不同于blobstore存根。这里是我的 init_blobstore_stub 的实现，它允许你在你的测试中写入和读取blobstore。

  from google.appengine.ext从google.appengine.api.blobstore导入测试床
从google.appengine.api.files导入blobstore_stub，file_blob_storage 
 import file_service_stub 
 $ b $ class TestbedWithFiles（testbed.Testbed）：
 $ b $ def init_blobstore_stub（self）：
 blob_storage = file_blob_storage.FileBlobStorage（'/ tmp / testbed.blobstore' ，
 testbed.DEFAULT_APP_ID）
 blob_stub = blobstore_stub.BlobstoreServiceStub（blob_storage）
 file_stub = file_service_stub.FileServiceStub（blob_storage）
 self._register_stub（'blobstore'，blob_stub）
 self._register_stub（'file'，file_stub）
 
＃您的代码... 
 def foo（）：
 from google.appengine.api导入文件s 
 blob_filename = files.blobstore.create（mime_type ='text / plain'）
 with files.open（blob_filename，'a'）as googfile：
 googfile.write（测试数据）
 
 files.finalize（blob_filename）
 
 tb = TestbedWithFiles（）
 tb.activate（）
 tb.init_blobstore_stub（）
 
 foo（）
  

I have a function that uses the Google Blobstore API, and here's a degenerate case:

#!/usr/bin/python
from google.appengine.ext import testbed

def foo():
    from google.appengine.api import files
    blob_filename = files.blobstore.create(mime_type='text/plain')
    with files.open(blob_filename, 'a') as googfile:
        googfile.write("Test data")

    files.finalize(blob_filename)

tb = testbed.Testbed()
tb.activate()
tb.init_blobstore_stub()

foo() # in reality, I'm a function called from a 'faux client'
      # in a unittest testcase.

The error this generates is:

Traceback (most recent call last):
  File "e.py", line 18, in 
    foo() # in reality, I'm a function called from a 'faux client'
  File "e.py", line 8, in foo
    blob_filename = files.blobstore.create(mime_type='text/plain')
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/files/blobstore.py", line 68, in create
    return files._create(_BLOBSTORE_FILESYSTEM, params=params)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/files/file.py", line 491, in _create
    _make_call('Create', request, response)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/files/file.py", line 230, in _make_call
    rpc = _create_rpc(deadline=deadline)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/files/file.py", line 213, in _create_rpc
    return apiproxy_stub_map.UserRPC('file', deadline)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/apiproxy_stub_map.py", line 393, in __init__
    self.__rpc = CreateRPC(service, stubmap)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/api/apiproxy_stub_map.py", line 67, in CreateRPC
    assert stub, 'No api proxy found for service "%s"' % service
AssertionError: No api proxy found for service "file"

I don't want to have to modify foo in order to be able to test it. Is there a way to make foo work as expected (i.e. create the given file) in Google App Engine's unit tests?

I would expect to be able to do this with Google's API Proxy, but I don't understand it well enough to figure it out on my own.

I'd be grateful for your thoughts and suggestions.

Thanks for reading.

解决方案

It seems like testbed.init_blobstore_stub() is outdated, because dev_appserver inits blobstore stubs differently. Here is my implementation of init_blobstore_stub that allows you to write to and read from blobstore in your tests.

from google.appengine.ext import testbed
from google.appengine.api.blobstore import blobstore_stub, file_blob_storage
from google.appengine.api.files import file_service_stub

class TestbedWithFiles(testbed.Testbed):

    def init_blobstore_stub(self):
        blob_storage = file_blob_storage.FileBlobStorage('/tmp/testbed.blobstore',
                                                testbed.DEFAULT_APP_ID)
        blob_stub = blobstore_stub.BlobstoreServiceStub(blob_storage)
        file_stub = file_service_stub.FileServiceStub(blob_storage)
        self._register_stub('blobstore', blob_stub)
        self._register_stub('file', file_stub)

# Your code...
def foo():
    from google.appengine.api import files
    blob_filename = files.blobstore.create(mime_type='text/plain')
    with files.open(blob_filename, 'a') as googfile:
        googfile.write("Test data")

    files.finalize(blob_filename)

tb = TestbedWithFiles()
tb.activate()
tb.init_blobstore_stub()

foo()

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