为Flask运行pytest时出现ModuleNotFoundError

Question

我的Flask应用程序具有以下目录结构

.
├── app
│   ├── api
│   │   ├── errors.py
│   │   └── __init__.py
│   ├── errors
│   │   ├── handlers.py
│   │   └── __init__.py
│   ├── __init__.py
│   └── main
│       ├── __init__.py
│       └── routes.py
├── config.py
├── main.py
├── README.md
├── requirements.txt
└── tests
    ├── conftest.py
    ├── functional
    │   ├── __init__.py
    └── └── test_errors.py

conftest.py的外观

import pytest
from app import create_app, db
from config import Config


class TestConfig(Config):
    TESTING = True
    SQLALCHEMY_DATABASE_URI = "sqlite://"
    LOG_TO_STDOUT = False


@pytest.fixture(scope="module")
def test_client():
    flask_app = create_app(TestConfig)

    # Flask provides a way to test your application by exposing the Werkzeug test Client
    # and handling the context locals for you.
    testing_client = flask_app.test_client()

    # Establish an application context before running the tests.
    ctx = flask_app.app_context()
    ctx.push()

    yield testing_client  # this is where the testing happens!

    ctx.pop()

但是，当我在根目录中并运行pytest时，会收到错误消息

ImportError while loading conftest '/home/user/Documents/flask-api-app/tests/conftest.py'.
tests/conftest.py:2: in <module>
    from app import create_app, db
E   ModuleNotFoundError: No module named 'app'

，这必须意味着测试不是从根目录运行的。我想念什么吗？我正在尝试关注Testing a Flask Application using pytest by Pat Kennedy

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