我需要测试一个在浏览器中打开一个新选项卡的功能
openStatementsReport(contactIds) {
window.open(`a_url_${contactIds}`);
}
我想模拟窗口的打开函数,这样我就可以验证正确的URL被传递给打开函数。
使用笑话,我不知道如何模拟窗口。我试着设置窗口。使用mock函数打开,但这种方式不起作用。下面是测试用例:
it('the correct URL is called', () => {
window.open = jest.fn();
statementService.openStatementsReport(111);
expect(window.open).toBeCalled();
});
但是它给出了误差
expect(jest.fn())[.not].toBeCalled()
jest.fn() value must be a mock function or spy.
Received:
function: [Function anonymous]
我应该对测试用例做什么?
我有一个实用函数,它允许我模拟窗口上的任何方法,如下所示:
function givenMockWindowMethods(methods: Partial<{ [key in keyof Window]: jest.Mock<any, any> }>): () => void {
const mocks = Object.values(methods);
Object.entries(methods).forEach(([key, value]) => {
Object.defineProperty(window, key, { value });
});
return (): void => mocks.forEach((mock) => mock?.mockClear());
}
因此,如果我需要模拟窗口上的open方法(或任何东西),我可以这样做:
const cleanupMocks = givenMockWindowMethods({ open: jest.fn() });
// expect(...).toBe(...)
//at the end of the test, clean it up
cleanupMocks()
我试过一个类似的测试,对我很有效……
我的代码:
export const Blah = () => {
const BLAH = 'https://www.google.com/'
const handleBlah = () => {
window.open(BLAH, '_blank')
}
return (
<button onClick={handleBlah}> BLAHBLAH </button>
)
}
我的测试使用Jest:
it('should be able to render "BLAHBLAH " button ', () => {
window.open = jest.fn();
const BLAH = 'https://www.google.com/'
const { getByText } = render(<Blah/>) // Get text by my page Blah
const buttonGoToBlah = getByText('BLAHBLAH') // Get button by text
fireEvent.click(buttonGoToBlah) // Simulate the click event
expect(window.open).toHaveBeenCalledTimes(1) // Expect the window.open have to been called at least once.
expect(window.open).toHaveBeenCalledWith(BLAH, '_blank'); // And the page should be the same called in my BLAH page
})