Django 测试数据库在测试完成后没有被删除

Question

背景

Django-pgpubsub 通过运行来监听 PostgresSQL 触发器

python manage.py listen

。此命令持续运行并作为 Django 信号和芹菜的轻量级替代方案，用于在 Shipment 模型实例的状态字段更改为特定值时发送电子邮件。

问题

集成测试使用

python manage.py listen

在单独的进程中调用

subprocess

命令。测试通过但测试数据库仍然存在，之后我必须手动删除它以防止下一次测试由于重复数据库而失败。无论

django-pytest

附带的什么拆卸功能都被调用，因为它在测试完成时输出：

Destroying test database for alias 'default' ('test_my_project_database')

测试

@pytest.mark.django_db(transaction=True) # needed to work
def test_shipment_status_notifications_with_listen_command_subprocess(testuser):
    user = testuser
    # model instances setup for the test
    notification_settings = NotificationSettings.objects.get(user=user)
    notification_settings.failed_attempt = True
    notification_settings.save()
    cust_email = "[email protected]"
    customer = Customer.objects.create(email=cust_email)
    order = Order.objects.create(customer=customer)
    shipment = Shipment.objects.create(user=user, order=order)

    listen_command = [
        "python",
        str(settings.ROOT_DIR / "manage.py"),
        "listen",
    ]
    env = os.environ.copy()
    # we need to update these env vars to use the actual test database instead of the live one
    # the process uses the live database by default
    env.update(
        {
            "DATABASE_URL":
                f"postgresql://{config('POSTGRES_USER')}:{config('POSTGRES_PASSWORD')}@127.0.0.1:5432/test_{config('POSTGRES_DB')}",
        }
    )

    listen_process = subprocess.Popen(
        listen_command,
        env=env,
    )
    time.sleep(2)  # confirmed needed
    # Change Shipment status to trigger the notification
    shipment.status = Shipment.FAILED_ATTEMPT
    shipment.save()

    time.sleep(2)  # confirmed needed
    listen_process.terminate()

    existing_notifications = Notification.objects.filter(
        type=Notification.Type.FAILED_DELIVERY_ATTEMPT,
        shipment=shipment,
        email=cust_email,
    )
    print(f"existing_notifications: {existing_notifications}")
    assert existing_notifications.count() == 1

我试过的

使用 pytest fixture 删除数据库（在

yield

之后调用 SQL 命令，因此它包含在测试的拆卸中）导致内置的

pytest-django

拆卸异常关于“连接已经关闭/不存在”。