Typescript 笑话和打字稿
我正在为封装fetchapi的函数编写测试Typescript 笑话和打字稿,typescript,jestjs,Typescript,Jestjs,我正在为封装fetchapi的函数编写测试 const callAPI = (uri: string, options: RequestParams) => { let headers = { requestId: shortid.generate() }; if (options.headers) { headers = { ...options.headers, ...headers}; } const opts = {...opt
const callAPI = (uri: string, options: RequestParams) => {
let headers = { requestId: shortid.generate() };
if (options.headers) {
headers = { ...options.headers, ...headers};
}
const opts = {...options, ...{ headers }};
return fetch(uri, opts);
};
对这个函数的测试如下:
it('should add requestId to headers', () => {
window.fetch = jest.fn();
callAPI('localhost', { method: 'POST' });
expect(window.fetch.mock.calls[0][1]).toHaveProperty('headers');
expect(window.fetch.mock.calls[0][1].headers).toHaveProperty('requestId');
});
问题是typescript无法识别fetch是模拟的,因此无法在window.fetch上找到mock属性
以下是错误:
[ts] Property 'mock' does not exist on type '(input: RequestInfo, init?: RequestInit) => Promise<Response>'.
[ts]属性“mock”在类型“(输入:RequestInfo,init?:RequestInit)=>Promise”上不存在。
如何修复此问题?您需要将
窗口.fetch
重新定义为jest.Mock
。为了清晰起见,最好定义一个不同的变量:
it('should add requestId to headers', () => {
const fakeFetch = jest.fn();
window.fetch = fakeFetch;
callAPI('localhost', { method: 'POST' });
expect(fakeFetch.mock.calls[0][1]).toHaveProperty('headers');
expect(fakeFetch.mock.calls[0][1].headers).toHaveProperty('requestId');
});
也可考虑移动<代码>窗口的嘲讽。在测试之外取出.<代码>以恢复它。
<代码>它('Test.',dot= >{it('test.', done => {
const mockSuccessResponse = {YOUR_RESPONSE};
const mockJsonPromise = Promise.resolve(mockSuccessResponse);
const mockFetchPromise = Promise.resolve({
json: () => mockJsonPromise,
});
var globalRef:any =global;
globalRef.fetch = jest.fn().mockImplementation(() => mockFetchPromise);
const wrapper = mount(
<MyPage />,
);
done();
});
const mockSuccessResponse={YOUR_RESPONSE};
const mockJsonPromise=Promise.resolve(mockSuccessResponse);
const mockFetchPromise=Promise.resolve({
json:()=>mockJsonPromise,
});
var globalRef:any=全局;
globalRef.fetch=jest.fn().mockImplementation(()=>mockFetchPromise);
常量包装器=装入(
,
);
完成();
});
您正在使用ts jest吗?
声明let global:{fetch:{}
并使用global.fetch()
而不是window.fetch()
。