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post-upgrade, unexpected assertion failures on error-handling function calls (includes repro)

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評估

難度
3/5
預估耗時
1-2 天
新手友好度
35/100
Issue 類型
缺陷
描述清晰度
需要釐清
活躍度
停滯
技術堆疊
javascript, react
領域
frontend, testing

研究方向

從連結的 CRA 重現開始,檢查 issue 中所示的 render、findByText 和 mockLog assertion 順序。確認升級後的 timing 行為,並記錄為什麼等待渲染出的錯誤並不能證明基於 effect 的 logging 呼叫已經完成。

由索引模型根據 Issue 內容生成。

描述

Relevant code or config:
  render(<App />);

  await screen.findByText('Failed!');

  //assertion fails unless we `waitFor` it
  expect(mockLog).toHaveBeenCalledWith('kaboom!')
What you did:

Upgraded existing application to react 18+ and RTL 13+.

What happened:

A number of tests starting failing assertions after upgrading.

In this case, the component is rendered with a simulated fetch failure. The component renders a child component that is responsible for error presentation and minor logging (in an effect hook). The test assertion on the logging function call fails unless it is awaited.

Reproduction:

I was able to reproduce the issue with a simple CRA repo, here: https://github.com/trv-wcaneira/fetch-err-waitfor-mcve

Problem description:

Pre-upgrade, it was sufficient to await the error message text rendered by the child component. Now it seems additional waiting is needed, and before I plaster waitFors all over our tests 😄, I'd just like to understand why.

Suggested solution:

I could obviously change all the tests to waitFor the logging function call, but would like to understand the change in behavior.

主要語言
JavaScript
星號
19.7k
分支
1.2k
PR 合併指標
30 天內沒有已合併 PR

環境準備

從這裡開始

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  2. 在 Issue 下留言說明你要接手 —— 這能避免兩個人做同樣的事。
  3. Fork 儲存庫,在一個分支上完成修改。
  4. 送出 Pull Request,並在描述裡引用這個 Issue 編號。

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