我正在尝试为我的文件上传表单编写测试。 该表格是Flask应用程序的一部分。 我正在使用鼻子2运行测试。
表单会上传一个json文件。服务器应该解析该文件并将其放入数据库中。当我用浏览器手动测试时，一切工作正常。
视图的相关部分如下所示：
def upload():
form = UploadForm()
if request.method == 'POST':
if form.validate_on_submit():
# error happens at this line
exercise_graph = json.load(request.files['graph'])
# ...
return render_template('exercises/upload.html', form=form)
测试中的相关功能如下：
def upload_exercise(self, name, description):
filename = name + ".json"
data={
'name' : name,
'description' : description,
'graph': (BytesIO(b"{}"), filename)
}
class TestingRequest(Request):
"""A testing request to use that will return a
TestingFileStorage to test the uploading."""
@property
def files(self):
d = MultiDict()
d['graph'] = TestingFileStorage(filename=filename)
return d
app.request_class = TestingRequest
return self.app.post('/exercises/upload',
content_type='multipart/form-data',
data=data,
follow_redirects=True)
我确实将此code用作测试功能的起点。我必须将StringIO更改为BytesIO，否则werkzeug会抱怨它期望使用字节对象。对于另一种上载二进制文件的表单，相同的测试过程也可以正常工作。
运行测试时，出现以下错误：
======================================================================
ERROR: test_exercise_upload_post (tests.test_exercises.ExercisesTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File ".../test_exercises.py", line 130, in test_exercise_upload_post
response = self.upload_exercise('PushUps', 'Push up your body with your arms')
File ".../test_exercises.py", line 90, in upload_exercise
follow_redirects=True)
File ".../python3.6/site-packages/werkzeug/test.py", line 840, in post
return self.open(*args, **kw)
File ".../python3.6/site-packages/flask/testing.py", line 200, in open
follow_redirects=follow_redirects
File ".../python3.6/site-packages/werkzeug/test.py", line 803, in open
response = self.run_wsgi_app(environ, buffered=buffered)
File ".../python3.6/site-packages/werkzeug/test.py", line 716, in run_wsgi_app
rv = run_wsgi_app(self.application, environ, buffered=buffered)
File ".../python3.6/site-packages/werkzeug/test.py", line 923, in run_wsgi_app
app_rv = app(environ, start_response)
File ".../python3.6/site-packages/flask/app.py", line 2309, in __call__
return self.wsgi_app(environ, start_response)
File ".../python3.6/site-packages/flask/app.py", line 2295, in wsgi_app
response = self.handle_exception(e)
File ".../python3.6/site-packages/flask/app.py", line 1741, in handle_exception
reraise(exc_type, exc_value, tb)
File ".../python3.6/site-packages/flask/_compat.py", line 35, in reraise
raise value
File ".../python3.6/site-packages/flask/app.py", line 2292, in wsgi_app
response = self.full_dispatch_request()
File ".../python3.6/site-packages/flask/app.py", line 1815, in full_dispatch_request
rv = self.handle_user_exception(e)
File ".../python3.6/site-packages/flask/app.py", line 1718, in handle_user_exception
reraise(exc_type, exc_value, tb)
File ".../python3.6/site-packages/flask/_compat.py", line 35, in reraise
raise value
File ".../python3.6/site-packages/flask/app.py", line 1813, in full_dispatch_request
rv = self.dispatch_request()
File ".../python3.6/site-packages/flask/app.py", line 1799, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File ".../python3.6/site-packages/flask_login/utils.py", line 261, in decorated_view
return func(*args, **kwargs)
File ".../exercises/views.py", line 54, in upload
exercise_graph = json.load(request.files['graph'])
File ".../python3.6/json/__init__.py", line 299, in load
parse_constant=parse_constant, object_pairs_hook=object_pairs_hook, **kw)
File ".../python3.6/json/__init__.py", line 354, in loads
return _default_decoder.decode(s)
File ".../python3.6/json/decoder.py", line 339, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File ".../python3.6/json/decoder.py", line 357, in raw_decode
raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
----------------------------------------------------------------------
似乎TestingFileStorage对象可能为空？ 我不确定是否了解该机制的真正作用。 我在BytesIO对象中指定的数据如何传输到TestingFileStorage？
还有其他可以尝试的方法吗？
任何帮助将不胜感激。