使用pytest测试Flask应用程序时找不到404

如果我手动运行它，此简单的Web服务就可以工作，但是在我的单元测试中，我得到了一个404 not found页面作为响应，阻止了我正确地测试应用程序。

正常行为：

资料夹结构：

/SRC
--web_application.py
/UNIT_TESTS
--test_wab_application.py

web_application.py

from flask import Flask, request, jsonify, send_from_directory

from python.Greeting import Greeting

application = Flask(__name__)


def create_app(test_config=None):
    # create and configure the app
    app = Flask(__name__, instance_relative_config=True)
    app.config.from_mapping(
        SECRET_KEY='mega_developer',
        DATABASE=os.path.join(app.instance_path, 'web_application.sqlite'),
    )
    try:
        os.makedirs(app.instance_path)
    except OSError:
        pass
    return app


@application.route('/greetings', methods=['GET', 'POST'])
def hello():

    # GET: for url manipulation #
    if request.method == 'GET':
        return jsonify(hello = request.args.get('name', 'world', str))

test_web_application.py

import tempfile
import pytest    
import web_application


class TestWebApplication:

    app = web_application.create_app()  # container object for test applications #

    @pytest.fixture
    def initialize_app(self):
        app = web_application.create_app()
        app.config['TESTING'] = True
        app.config['DEBUG'] = False
        app.config['WTF_CSRF_ENABLED'] = False
        app.config['DATABASE'] = tempfile.mkstemp()
        app.testing = True
        self.app = app

    def test_hello_get(self, initialize_app):
        with self.app.test_client() as client:
            response = client.get('/greetings?name=Rick Sanchez')

        assert response.status_code == 200

测试结果（仅最相关的部分）：

Launching pytest with arguments test_web_application.py::TestWebApplication::test_hello_get in C:\Users\Xrenyn\Documents\Projekte\Studium_Anhalt\QA&Chatbots Exercises\Exercise 2 - Web Service Basics\UNIT_TESTS

============================= test session starts =============================
platform win32 -- Python 3.8.0, pytest-5.2.2, py-1.8.0, pluggy-0.13.0 -- C:\Users\Xrenyn\Documents\Projekte\Studium_Anhalt\QA&Chatbots Exercises\Exercise 2 - Web Service Basics\VENV\Scripts\python.exe
cachedir: .pytest_cache
rootdir: C:\Users\Xrenyn\Documents\Projekte\Studium_Anhalt\QA&Chatbots Exercises\Exercise 2 - Web Service Basics\UNIT_TESTS
collecting ... collected 1 item

test_web_application.py::TestWebApplication::test_hello_get FAILED       [100%]
test_web_application.py:21 (TestWebApplication.test_hello_get)
404 != 200

Expected :200
Actual   :404

到目前为止，我已经为中的client.get()方法测试了各种替代的路由路径test-web_application.py，包括诸如'/ SRC / greetings？name = Rick Sanchez'或'../SRC/greetings?name=Rick Sanchez'之类的组合，但效果没有任何不同。

您对我可能做错了什么或如何从单元测试中访问Web服务的功能有任何想法吗？