【发布时间】：2020-06-18 07:56:51
【问题描述】：
问题如下，我创建了一个虚拟示例。文件夹结构在哪里：
.
├── api_bp
│ └── __init__.py
├── app.py
├── pytest.ini
└── tests
├── conftest.py
├── __init__.py
├── test_todo1.py
└── test_todo2.py
文件夹api_bp内__init__.py中的代码：
# __init__.py
from flask import Blueprint
api_bp = Blueprint('api', __name__)
Flask 应用：
# app.py
from flask import Flask, Blueprint
from flask_restful import Api, Resource
class TodoItem(Resource):
def get(self, id):
return {'task': 'Say "Hello, World!"'}
def create_app():
"""Initialize the app. """
app = Flask(__name__)
from api_bp import api_bp
# api_bp = Blueprint('api', __name__)
api = Api(api_bp)
api.add_resource(TodoItem, '/todos/<int:id>')
app.register_blueprint(api_bp, url_prefix='/api')
return app
if __name__ == '__main__':
app = create_app()
app.run(debug=True)
出于测试目的，我为不同的待办事项准备了客户端夹具和两个测试（我有意将它们放入单独的模块中）：
# conftest.py
import pytest
from app_factory import create_app
@pytest.fixture(scope='module')
def client():
flask_app = create_app()
testing_client = flask_app.test_client()
context = flask_app.app_context()
context.push()
yield testing_client
context.pop()
# test_todo1.py
import pytest
def test_todo2(client):
"""Test"""
response = client.get('/api/todos/1')
print(response)
assert response.status_code == 200
# test_todo2.py
import pytest
def test_todo2(client):
"""Test"""
response = client.get('/api/todos/2')
print(response)
assert response.status_code == 200
所以当我运行$ pytest -v 对其进行测试时，我最终得到以下错误：
AssertionError: View function mapping is overwriting an existing endpoint function: api.todoitem
这是因为注册了蓝图。我想了解烧瓶 (flask-restful) 与 pytest 相结合的神奇之处。因为如果我像这样定义我的app.py 模块，它会成功通过测试：
# app.py
from flask import Flask, Blueprint
from flask_restful import Api, Resource
class TodoItem(Resource):
def get(self, id):
return {'task': 'Say "Hello, World!"'}
def create_app():
"""Initialize the app. """
app = Flask(__name__)
# note: I commented the line below and defined the blueprint in-place
# from api_bp import api_bp
api_bp = Blueprint('api', __name__)
api = Api(api_bp)
api.add_resource(TodoItem, '/todos/<int:id>')
app.register_blueprint(api_bp, url_prefix='/api')
return app
if __name__ == '__main__':
app = create_app()
app.run(debug=True)
$ pytest -v
tests/test_api1.py::test_todo2 PASSED [ 50%]
tests/test_api2.py::test_todo2 PASSED [100%]
或者，如果我不使用应用工厂，它也可以正常工作：
# app.py
from flask import Flask, Blueprint
from flask_restful import Api, Resource
app = Flask(__name__)
api_bp = Blueprint('api', __name__)
api = Api(api_bp)
class TodoItem(Resource):
def get(self, id):
return {'task': 'Say "Hello, World!"'}
api.add_resource(TodoItem, '/todos/<int:id>')
app.register_blueprint(api_bp, url_prefix='/api')
如果我将所有测试放在一个模块中，或者我先注册蓝图然后添加如下资源，也可以修复它：
# app.py
...
def create_app():
"""Initialize the app. """
app = Flask(__name__)
from api_bp import api_bp
api = Api(api_bp)
app.register_blueprint(api_bp, url_prefix='/api')
api.add_resource(TodoItem, '/todos/<int:id>')
return app
...
谁知道这里发生了什么并且可以解释magic？提前致谢。
【问题讨论】：
标签： python flask pytest flask-restful