如何用pytest正确测试NiceGUI应用——解决上下文/插槽错误

我在为NiceGUI应用编写pytest测试代码时，遇到了多个上下文相关的错误，尝试了多种修复方案但都未解决。需要正确配置测试环境，确保：

• 正确的客户端/用户设置
• UI创建时的上下文正确
• 测试过程中插槽栈有效

初始设置代码 #

@pytest.fixture
async def f_ui(mock_f_core, user):
    init_ui(mock_f_core)
    await user.open("/")
    return await create_ui()

首次出现的错误 #

KeyError: '00000000-0000-0000-0000-000000000000'

测试文件结构 #

@pytest.mark.asyncio
async def test_init(f_ui, mock_f_core):
    ui = await f_ui
    assert ui.f_core == mock_f_core
    assert app.storage.client_id == "00000000-0000-0000-0000-000000000000"
    assert ui.process_grid is not None
    assert ui.status_label is not None

尝试的修复方案及对应错误 #

方案1：设置客户端实例 #

@pytest.fixture
def client():
    mock_client = Mock()
    mock_client.instances = {}
    mock_client.connected = True
    return mock_client

@pytest.fixture
async def user(client) -> User:
    client_id = "00000000-0000-0000-0000-000000000000"
    client.instances[client_id] = client
    return User(client)

错误：

RuntimeError: The current slot cannot be determined because the slot stack for this task is empty.

方案2：使用异步上下文管理器 #

@pytest.fixture
async def user(client) -> AsyncGenerator[User, None]:
    client_id = "00000000-0000-0000-0000-000000000000"
    client.instances[client_id] = client
    async with User(client) as user:
        yield user

错误：

TypeError: 'User' object does not support the asynchronous context manager protocol

方案3：使用page_context #

from nicegui.testing import page_context
# ...
with page_context('/'):
    ui_instance = await create_ui()

错误：

ImportError: cannot import name 'page_context' from 'nicegui.testing'

方案4：使用ui.builder #

with ui.builder():
    ui_instance = await create_ui()

错误：

AttributeError: module 'nicegui.ui' has no attribute 'builder'

当前尝试：使用ui.header #

with ui.header():
    ui_instance = await create_ui()

问题：仍存在上下文/插槽错误。

内容的提问来源于stack exchange，提问作者n0name