[英]How to test a form with action redirection using react-testing-library
我使用表單和我的 React 應用程序的輸入添加了一個搜索欄,我想檢查它是否重定向到正確的頁面。 我正在使用 react-testing-library 和 react-router-dom。
這是我的組件(簡化):
const SearchBar = () => (
<form action={'/search'}>
<input type="search" name="q" placeholder="search"></input>
</form>
)
所以我編寫了這個測試來檢查當我在輸入中輸入內容時,我是否被重定向到 /search 頁面(這發生在我的瀏覽器中)。 我跟着https://testing-library.com/docs/example-react-router/想出了這個:
it('redirects to search page', async () => {
const history = createMemoryHistory();
const header = render(
<Router history={history}>
<Switch>
<Route exact path="/">
<SearchBar />
</Route>
<Route path="/search">
<div>this is the search page</div>
</Route>
</Switch>
</Router>
);
const searchBar = header.getByPlaceholderText('search');
fireEvent.change(searchBar, { target: { value: 'myQuery' } });
fireEvent.submit(searchBar);
expect(screen.getAllByText('this is the search page')).toBeInTheDocument();
});
不幸的是,它失敗並出現以下錯誤:
TestingLibraryElementError: Unable to find an element with the text: this is the search page. This could be because the text is broken up by multiple elements. In this case, you can provide a function for your text matcher to make your matcher more flexible.
<body>
<div>
<form
action="/search"
>
<input
name="q"
placeholder="search"
type="search"
/>
</form>
</div>
</body>
91 | fireEvent.change(searchBar, { target: { value: 'myQuery' } });
92 | fireEvent.submit(searchBar);
> 93 | expect(screen.getAllByText('this is the search page')).toBeInTheDocument();
| ^
94 | });
95 | });
96 |
at Object.getElementError (node_modules/@testing-library/dom/dist/config.js:37:19)
at node_modules/@testing-library/dom/dist/query-helpers.js:92:38
at getAllByText (node_modules/@testing-library/dom/dist/query-helpers.js:127:15)
at Object.<anonymous> (src/components/Header/Header.test.tsx:93:19)
據我了解,我相信提交表單不會改變我的路由器的位置。
有沒有辦法在不更改我的代碼的情況下通過測試? 或者我應該忘記依賴form
的action
,而是實現一個處理重定向的自定義onSubmit
屬性 - 我可以更輕松地測試它?
謝謝:)
表單操作不使用 React Router DOM,而是使用本地方法。
<form action={'/search'}>
如果你想為此使用 React Router,請考慮使用 React onSubmit
處理程序。 然后,在與您的實際實現集成后,您的原始測試應該或多或少地工作。
const SearchBar = () => {
const history = useHistory();
const handleSubmit = (event) => {
// Prevent default native behavior of submit
event.preventDefault();
// Push the new location to React Router DOM
history.push("/search");
};
return (
<form onSubmit={handleSubmit}>
<input type="search" name="q" placeholder="search"></input>
</form>
);
};
如果您不希望更改實現以使用路由器,我認為一個好的解決方案是測試action
屬性是否正確而不測試本機行為,特別是因為很難測試非路由器導航更改(示例)並且表單提交沒有完全實現到 JSDOM 中。
it('has form action for the search page', () => {
const history = createMemoryHistory();
const header = render(
<Router history={history}>
<SearchBar />
</Router>
);
const searchBar = header.getByPlaceholderText('search');
expect(searchBar).toHaveAttribute('action', '/search');
});
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