我正在使用反应测试库,我想测试一个按钮:
<button data-testid="btn" onClick={() => props.history.push(`/post/${value}`)} > Search </button>
<input data-testid="input" type="text" value={value} onChange={(e) => handle(e.target.value)} />
我测试了它的onClick函数,如下所示:
test('Button should navigate the url when enabled', () => {
render(<Home />);
const input = screen.getByTestId('input');
const btn = screen.getByTestId('btn');
fireEvent.change(input, { target: { value: '12' } });
fireEvent.click(btn);
});
但这给我一个错误:
TypeError: Cannot read property 'push' of undefined
19 | <button
20 | data-testid="btn"
> 21 | onClick={() => props.history.push(`/post/${value}`)}
| ^
22 | disabled={!value}
23 | type="submit"
24 | >
当我启动npm时,该应用程序本身运行良好,但仅在测试时失败。 如何解决未定义的问题?
答案 0 :(得分:1)
在这种情况下,您必须将道具传递到渲染的组件-<Home />
:
import history from 'history' // Or a file you made that contains an instance of history
test('Button should navigate the url when enabled', () => {
render(<Home history={history} {...otherProps} />);
const input = screen.getByTestId('input');
const btn = screen.getByTestId('btn');
fireEvent.change(input, { target: { value: '12' } });
fireEvent.click(btn);
});