[英]Proper mock of fetch in Typescript
I've got a question about this code:我对这段代码有疑问:
import useCountry from './useCountry';
import { renderHook } from '@testing-library/react-hooks';
import { enableFetchMocks } from 'jest-fetch-mock';
enableFetchMocks();
it('should make proper api call', async () => {
const resultCountries = {
PL: 'Poland',
CA: 'Canada',
};
jest.spyOn(global, 'fetch').mockImplementation(() =>
Promise.resolve({
json: () => Promise.resolve(resultCountries),
} as Response),
);
const expected = [
{ code: 'PL', name: 'Poland' },
{ code: 'CA', name: 'Canada' },
];
const { result, waitForNextUpdate } = renderHook(() => useCountry());
await waitForNextUpdate();
expect(fetch).toHaveBeenCalled();
expect(result.current).toEqual(expected);
});
When removing as Response
, I'm getting this Typescript warning: as Response
删除时,我收到此 Typescript 警告:
TS2345: Argument of type '() => Promise<{ json: () => Promise<{ PL: string; TS2345: '() => Promise<{ json: () => Promise<{ PL: string; 类型的参数CA: string; CA:字符串; }>; }>; }>' is not assignable to parameter of type '(input?: string | Request | undefined, init?: RequestInit | undefined) => Promise'. }>' 不可分配给类型为'(input?: string | Request | undefined, init?: RequestInit | undefined) => Promise' 的参数。 Type 'Promise<{ json: () => Promise<{ PL: string;输入'Promise<{ json: () => Promise<{ PL: string; CA: string; CA:字符串; }>; }>; }>' is not assignable to type 'Promise'. }>' 不可分配给类型 'Promise'。 Type '{ json: () => Promise<{ PL: string;输入'{ json: () => Promise<{ PL: string; CA: string; CA:字符串; }>; }>; }' is missing the following properties from type 'Response': headers, ok, redirected, status, and 11 more. }' 缺少类型 'Response' 中的以下属性:headers、ok、redirected、status 等 11 个。
I would like to ask how to properly mock the fetch
, because this as Response
feels like a bad practise.我想问一下如何正确模拟fetch
,因为这as Response
感觉像是一种不好的做法。
I had this problem with mocking fetch
function and just add the below code in .test.tsx
.我在 mocking fetch
function 时遇到了这个问题,只需在.test.tsx
中添加以下代码。
//app.test.tsx
global.fetch = jest.fn(async () =>
Promise.resolve({ json: async () => Promise.resolve({ id: 0 }) })
) as jest.Mock;
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