我試圖用Jest在我的react/react-native庫(只有一些業務邏輯裏面)上運行一些測試。Jest拋出TypeError:無法讀取未定義的屬性'fetch'
我們正在測試使用獲取函數(使用whatwg-fetch進行填充)的操作。 我已經添加了whatwg-fetch(感謝Safari)的反應。
每當我試圖運行一個測試,我得到這個錯誤:
TypeError: Cannot read property 'fetch' of undefined
at node_modules/whatwg-fetch/fetch.js:4:11
at Object.<anonymous> (node_modules/whatwg-fetch/fetch.js:461:3)
at Object.<anonymous> (node_modules/jest-expo/src/setup.js:138:416)
什麼可能導致此問題?在jest配置中有沒有辦法避免這種情況?
下面是調試的一些文件:在的package.json
玩笑配置
"jest": {
"preset": "jest-expo",
"moduleFileExtensions": [
"js",
"jsx",
"ts",
"tsx"
],
"verbose": true,
"transform": {
"^.+\\.(js|ts|tsx)$": "<rootDir>/node_modules/babel-jest"
},
"testRegex": "(/__tests__/.*|\\.(test|spec))\\.(ts|tsx|js)$",
"testPathIgnorePatterns": [
"\\.snap$",
"<rootDir>/node_modules/",
"<rootDir>/dist/"
],
"transformIgnorePatterns": [
"node_modules/?!react-native"
]
},
的WebPack配置:
const config = {
entry: [
'whatwg-fetch',
__dirname + '/src/index.ts',
],
devtool: 'source-map',
output: {
path: path.join(__dirname, '/dist'),
filename: 'index.js',
library: 'checkinatwork-module',
libraryTarget: 'umd',
umdNamedDefine: true,
},
module: {
loaders: [
{ test: /\.(tsx|ts)?$/, loader: 'ts-loader', exclude: /node_modules/ },
],
},
resolve: {
modules: [
'./src',
'node_modules',
],
extensions: ['.js', '.ts', '.jsx', '.tsx', 'json'],
},
plugins: [
],
};
測試文件:
import expect from 'expect';
import * as actions from '../../src/components/Checkin/checkin.action';
import * as reducers from '../../src/components/Checkin/checkin.reducer';
import configureMockStore from 'redux-mock-store';
import thunk from 'redux-thunk';
import nock from 'nock';
const middlewares = [ thunk ];
const mockStore = configureMockStore(middlewares);
describe('=> ADD CHECKIN ACTIONS',() => {
describe('- REQUEST',() => {
it('Action: ADD_CHECKIN_REQUEST should request addCawCheckin',() => {
const expectedAction = {
type: actions.ADD_CHECKIN_REQUEST,
isFetching: true,
};
expect(actions.addCheckinRequest())
.toEqual(expectedAction);
});
it('Reducer: newCheckin should trigger ADD_CHECKIN_REQUEST and initiate loading',() => {
const expectedState = {
isFetching: true,
status: null,
};
expect(reducers.newCheckin(reducers.newCheckinDefaultState, actions.addCheckinRequest()))
.toEqual(expectedState);
});
});
動作文件:
export const getCheckins = (sessionId, date, url, isRefresh) => {
const config = {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({
sessionId: {sessionId},
date: {date},
}),
};
return dispatch => {
if (!isRefresh) {
dispatch(getCheckinsRequest());
}
return fetch(url + 'getCAWCheckIns', config)
.then(response => response.json())
.then(({ checkins }) => {
dispatch(getCheckinsSuccess(checkins));
}).catch(err => {
dispatch(getCheckinsError('Get checkins failed'));
console.error('Get checkins failed: ', err);
});
};
};
謝謝!
它不適合我。我在測試文件中添加了導入。 – clementino36