Can't mock a ES6 imported function in NodeJS - node.js

I've been trying for some time to mock the fetchLiveMatches imported function with no success. I've been browsing for some ideas but I think I ran out of it, so I could use some help. Any ideas of what I am doing wrong?
live.test.js
import * as liveController from "./live";
import { jest } from "#jest/globals";
import * as liveService from "../service/live";
import { buildReq, buildRes, buildNext } from "../utils/testingHelper";
jest.mock("../service/live");
beforeEach(() => {
jest.clearAllMocks();
});
describe("Live Controller", () => {
test("calls fetchLiveMatches function to fetch from external API", async () => {
const req = buildReq();
const res = buildRes();
const next = buildNext();
await liveController.getLiveMatches(req, res, next);
expect(next).not.toHaveBeenCalled();
expect(liveService.fetchLiveMatches).toHaveBeenCalled();
expect(res.status).toHaveBeenCalledWith(500);
expect(res.status).toHaveBeenCalledTimes(1);
});
});
service/live.js
import axios from "axios";
async function fetchLiveMatches() {
// Some hidden code
return axios({
method: "get",
url: `${API_FOOTBALL_BASE_URL}${GET_EVENTS}${MATCH_LIVE}${WIDGET_KEY}${TIMEZONE}${DETAILS}`,
headers: {}
}).then(res => res.data);
}
export { fetchLiveMatches };
jest.config.js
export default {
testEnvironment: "jest-environment-node",
transform: {}
};
package.json
{
"name": "server",
"version": "1.0.0",
"main": "index.js",
"type": "module",
"license": "MIT",
"dependencies": {
"express": "^4.18.2"
},
"devDependencies": {
"axios": "^1.1.3",
"eslint": "^8.26.0",
"jest": "^29.2.2",
"prettier": "^2.7.1"
},
"scripts": {
"start": "node --watch index.js",
"start:no-watch": "node index.js",
"test": "node --experimental-vm-modules node_modules/jest/bin/jest.js --watch"
}
}
Test Error Output
Live Controller › calls fetchLiveMatches function to fetch from external API
expect(received).toHaveBeenCalled()
Matcher error: received value must be a mock or spy function
Received has type: function
Received has value: [Function fetchLiveMatches]

Just posting the solution I found for anyone who eventually is facing the same problem:
First, since I'm using ES6/module imports without Babel I changed the mock function to unstable_mockModule, and then based on the docs I decided to try dynamic imports in test scope after mocking the modules.
If you're using ES module imports then you'll normally be inclined to put your import statements at the top of the test file. But often you need to instruct Jest to use a mock before modules use it. For this reason, Jest will automatically hoist jest.mock calls to the top of the module (before any imports). To learn more about this and see it in action, see this repo.
The test component works with the following code:
import { jest } from "#jest/globals";
import { buildReq, buildRes, buildNext } from "../utils/testingHelper";
describe("Live Controller", () => {
test("calls fetchLiveMatches function to fetch from external API", async () => {
jest.unstable_mockModule("../service/live", () => ({
fetchLiveMatches: jest.fn(() => [])
}));
const { getLiveMatches } = await import("./live");
const { fetchLiveMatches } = await import("../service/live");
const req = buildReq();
const res = buildRes();
const next = buildNext(msg => console.log(msg));
await getLiveMatches(req, res, next);
expect(fetchLiveMatches).toHaveBeenCalled();
expect(res.status).toHaveBeenCalledWith(200);
expect(res.status).toHaveBeenCalledTimes(1);
});
});

Related

What is the solution to the error I encountered while using the soap module in Node.js

I am using the soap module in Node.js as follows
import soap from "soap";
const ADRES = 'https://tckimlik.nvi.gov.tr/service/kpspublic.asmx?WSDL';
let degerler = {
TCKimlikNo: 11111111111,
Ad: 'YUSUF SEFA',
Soyad: 'SEZER',
DogumYili: 1111
};
soap.createClient(ADRES, (err, client) =\> {
client.TCKimlikNoDogrula(degerler, (err, result) =\> {
if (result.TCKimlikNoDogrulaResult) {
console.log('information is correct');
} else {
console.log('Information is incorrect');
}
});
});
However, I am getting the following error as output.
PS C:\\laragon\\www\\node-soap\> npm start
> soap#1.0.0 start
> node app.js
C:\\laragon\\www\\node-soap\\node_modules\\soap\\lib\\http.js:40
this.\_request = options.request || req\["default"\].create();
^
TypeError: Cannot read properties of undefined (reading 'create')
at new HttpClient (C:\\laragon\\www\\node-soap\\node_modules\\soap\\lib\\http.js:40:59)
at Object.open_wsdl (C:\\laragon\\www\\node-soap\\node_modules\\soap\\lib\\wsdl\\index.js:1270:48)
at openWsdl (C:\\laragon\\www\\node-soap\\node_modules\\soap\\lib\\soap.js:70:16)
at C:\\laragon\\www\\node-soap\\node_modules\\soap\\lib\\soap.js:48:13
at \_requestWSDL (C:\\laragon\\www\\node-soap\\node_modules\\soap\\lib\\soap.js:76:9)
at Object.createClient (C:\\laragon\\www\\node-soap\\node_modules\\soap\\lib\\soap.js:94:5)
at file:///C:/laragon/www/node-soap/app.js:12:6
at ModuleJob.run (node:internal/modules/esm/module_job:193:25)
at async Promise.all (index 0)
at async ESMLoader.import (node:internal/modules/esm/loader:526:24)
PS C:\\laragon\\www\\node-soap\>
package.json content
{
"name": "soap",
"version": "1.0.0",
"description": "",
"main": "app.js",
"type": "module",
"scripts": {
"test": "echo "Error: no test specified" && exit 1",
"start": "node app.js"
},
"author": "",
"license": "ISC",
"dependencies": {
"express": "^4.18.2",
"nodemon": "^2.0.20",
"soap": "^0.45.0"
}
}
What is the reason for this error? Despite all the searches on the internet, I could not find the solution for this. Is there a problem with the version? Where is the error, I can't try this soap module of the believer because of this error.
If I am not mistaken import soap from soap is python syntax. This seems to work without any problem:
var soap = require('soap');
const ADRES = 'https://tckimlik.nvi.gov.tr/service/kpspublic.asmx?WSDL';
let degerler = {
TCKimlikNo: 11111111111,
Ad: 'YUSUF SEFA',
Soyad: 'SEZER',
DogumYili: 1111
};
soap.createClient(ADRES, (err, client) => {
client.TCKimlikNoDogrula(degerler, (err, result) => {
if (result.TCKimlikNoDogrulaResult) {console.log('True'); }
else {console.log('False'); }
});
});

Error while deploying a smart contract to Mumbai testnet through Hardhat

I've been having this problem while trying to deploy a smart contract to the Mumbai testnet using Hardhat, and I keep getting the following error:
Error HH9: Error while loading Hardhat's configuration.
You probably tried to import the "hardhat" module from your config or a file imported from it.
This is not possible, as Hardhat can't be initialized while its config is being defined.
To learn more about how to access the Hardhat Runtime Environment from different contexts go to https://hardhat.org/hre
Here's my smart contract code:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.1;
// implements the ERC721 standard
import "#openzeppelin/contracts/token/ERC721/ERC721.sol";
// keeps track of the number of tokens issued
import "#openzeppelin/contracts/utils/Counters.sol";
import "#openzeppelin/contracts/access/Ownable.sol";
// Here we need to get the contract object sent from the frontend React app and replace the properties of the contract hereunder
// Accessing the Ownable method ensures that only the creator of the smart contract can interact with it
contract myContract is ERC721, Ownable {
using Counters for Counters.Counter;
Counters.Counter private currentTokenId;
/// #dev Base token URI used as a prefix by tokenURI().
string public baseTokenURI;
constructor() ERC721("MyToken", "MTK") {
baseTokenURI = "";
}
function mintTo(address recipient) public returns (uint256) {
currentTokenId.increment();
uint256 newItemId = currentTokenId.current();
_safeMint(recipient, newItemId);
return newItemId;
}
/// #dev Returns an URI for a given token ID
function _baseURI() internal view virtual override returns (string memory) {
return baseTokenURI;
}
/// #dev Sets the base token URI prefix.
function setBaseTokenURI(string memory _baseTokenURI) public {
baseTokenURI = _baseTokenURI;
}
}
Here's the deploy script:
const { ethers } = require("hardhat");
async function main() {
// Fetching the compiled contract using ethers.js
const contract = await ethers.getContractFactory("myContract");
// calling deploy() will return an async Promise that we can await on
const CustomSC = await contract.deploy();
console.log(`Contract deployed to address: ${CustomSC.address}`);
}
main()
.then(() => process.exit(0))
.catch((error) => {
console.error(error);
process.exit(1);
});
And here's my hardhat.config file:
/**
* #type import('hardhat/config').HardhatUserConfig
*/
require('dotenv').config();
require("#nomiclabs/hardhat-ethers");
require("#nomiclabs/hardhat-waffle");
require("./scripts/deploy.js");
require("#nomiclabs/hardhat-etherscan");
const { MORALIS_POLYGON_KEY, POLYGONSCAN_API_KEY, ACCOUNT_PRIVATE_KEY } = process.env;
module.exports = {
solidity: "0.8.1",
defaultNetwork: "mumbai",
networks: {
hardhat: {},
mumbai: {
url: `${MORALIS_POLYGON_KEY}`,
accounts: [`0x${ACCOUNT_PRIVATE_KEY}`],
},
},
etherscan: {
apiKey: POLYGONSCAN_API_KEY,
},
};
And here's my package.json file:
{
"name": "backend",
"version": "1.0.0",
"description": "backend for the NFT Marketplace dApp",
"main": "src/server.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"start": "nodemon src/server.js",
"build": "node src/server.js"
},
"author": "Ayed Oukhay",
"license": "ISC",
"dependencies": {
"#openzeppelin/contracts": "^4.0.0",
"body-parser": "^1.20.0",
"cors": "^2.8.5",
"dotenv": "^16.0.0",
"express": "^4.18.1",
"helmet": "^5.0.2",
"mongodb": "^4.5.0",
"mongoose": "^6.3.2",
"nodemon": "^2.0.16",
"web3": "^1.7.3"
},
"devDependencies": {
"#nomiclabs/hardhat-ethers": "^2.0.6",
"#nomiclabs/hardhat-etherscan": "^3.0.3",
"#nomiclabs/hardhat-waffle": "^2.0.3",
"chai": "^4.3.6",
"ethereum-waffle": "^3.4.4",
"ethers": "^5.6.6",
"hardhat": "^2.9.5"
}
}
When I tried fixing it by replacing the following line:
const { ethers } = require("hardhat");
with: const { ethers } = require("hardhat/config");
I get the following error:
TypeError: Cannot read property 'getContractFactory' of undefined
And even when I replaced the deploy.js code with one that's based on tasks and helpers, it compiles successfully but the npx hardhat run scripts/deploy.js --network mumbai it doesn't return anything.
here's the code that I replaced it with:
deploy.js
const { task } = require("hardhat/config");
const { getAccount } = require("./helpers.js");
task("deploy", "Deploys the smart contract ...").setAction(async function (taskArguments, hre) {
const myContractFactory = await hre.ethers.getContractFactory("myContract", getAccount());
console.log('Deploying myContract...');
const contract = await myContractFactory.deploy();
await contract.deployed();
console.log(`Contract deployed to address: ${contract.address}`);
});
and helpers.js
const { ethers } = require("ethers");
const { getContractAt } = require("#nomiclabs/hardhat-ethers/internal/helpers");
// Helper method for fetching environment variables from .env
function getEnvVariable(key, defaultValue) {
if (process.env[key]) {
return process.env[key];
}
if (!defaultValue) {
throw `${key} is not defined and no default value was provided`;
}
return defaultValue;
}
// Helper method for fetching a connection provider to the Ethereum network
function getProvider() {
return ethers.getDefaultProvider(getEnvVariable("NETWORK", "mumbai"), {
moralis: getEnvVariable("MORALIS_POLYGON_KEY"),
});
}
// RQ:: The getProvider() helper also lets us use other EVM networks (like Ethereum mainnet or Polygon) by optionally setting a NETWORK environment variable in .env.
// Helper method for fetching a wallet account using an environment variable for the PK
function getAccount() {
return new ethers.Wallet(getEnvVariable("ACCOUNT_PRIVATE_KEY"), getProvider());
}
// Helper method for fetching a contract instance at a given address
function getContract(contractName, hre) {
const account = getAccount();
return getContractAt(hre, contractName, getEnvVariable("NFT_CONTRACT_ADDRESS"), account);
}
module.exports = {
getEnvVariable,
getProvider,
getAccount,
getContract,
}
Any help would be really appreciated, I've been stuck on this for almost a week now.
Ironically, I found the solution just as I posted this. well, here it is for anyone who's facing the same problem: in the hardhat.config file, remove the '${}' from both network url and accounts. that solved it for me. Can't believe it took me so long to figure out lol
so your config file should look like this:
/**
* #type import('hardhat/config').HardhatUserConfig
*/
require('dotenv').config();
require("#nomiclabs/hardhat-ethers");
require("#nomiclabs/hardhat-waffle");
// require("./scripts/deploy.js");
require("#nomiclabs/hardhat-etherscan");
const { MORALIS_POLYGON_KEY, POLYGONSCAN_API_KEY, ACCOUNT_PRIVATE_KEY } = process.env;
module.exports = {
solidity: "0.8.1",
defaultNetwork: "mumbai",
networks: {
hardhat: {},
mumbai: {
url: MORALIS_POLYGON_KEY,
accounts: [ACCOUNT_PRIVATE_KEY],
},
},
etherscan: {
apiKey: POLYGONSCAN_API_KEY,
},
};

Testing NodeJS with Mocha: 'Require is not defined'

EDIT:
As per the comment on the answer below: removing "type": "module" from package.json, which as I understand it is what makes Node understand 'import' and 'export' statements, and reverting everything to 'require' and 'module.exports' solved the issue.
Is there a way to keep 'import' and 'export' and still make Mocha work?
I have a very simple Node file that I'm trying to test with Mocha/Chai. The actual code is trivial, this is just to learn a bit about Mocha and how to use it. But when I run the Mocha test, I get the error ERROR: ReferenceError: require is not defined
`
I did some googling for people experiencing the same problem but the examples that I came up with were when they were running the test in the browser (see, for example, Mocha, "require is not defined" when test in browser).
The file I want to test, index.js
const argv = require('minimist')(process.argv.slice(2));
const digitTester = /\d/g;
const capTester = /[A-Z]/g;
const dict = {
length:10,
must_have_numbers: true,
must_have_caps: true
}
export default function passwordCheck(password) {
if (!password) return false;
if (typeof password !== "string") return false;
if (password.length < dict.length) return false; // assumes that 10 is a MINIMUM length
if (dict.must_have_numbers && !digitTester.test(password)) return false;
return !(dict.must_have_caps && !capTester.test(password));
}
if (argv._.length) {
console.log(passwordCheck(argv._[0]))
}
/**
* alternate version to check a lot of passwords:
*
* if (argv._.length) {
* for (const pwd of argv_) console.log(passwordCheck(pwd)
*}
*
*/
the mocha file, test/index.test.js
const chai = require('chai')
const expect = chai.expect
const passwordCheck = require('../index.js')
const tooShort = "A2a"
const noCaps = "a2abcdefghijklmnop"
const noNumber = "Aabcdefghijklmnop"
const good = "A2abcdefghijklmnop"
describe('password checking', () => {
it('should return false for passwords less than length 10', () => {
expect(passwordCheck(tooShort)).to.be.false;
});
it('should return false for passwords without a capital letter', () => {
expect(passwordCheck(noCaps)).to.be.false;
});
it('should return false for passwords without a number', () => {
expect(passwordCheck(noNumber)).to.be.false;
});
it('should return true for passwords that match criteria', () => {
expect(passwordCheck(good)).to.be.true;
});
});
and package.json
{
"name": "codetest",
"version": "1.0.0",
"main": "index.js",
"type": "module",
"scripts": {
"test": "mocha"
},
"keywords": [],
"author": "",
"license": "ISC",
"description": "",
"dependencies": {
"#types/minimist": "^1.2.1",
"#types/node": "^14.14.20",
"chai": "^4.2.0",
"minimist": "^1.2.5",
"mocha": "^8.2.1"
}
}
and the error message is
✖ ERROR: ReferenceError: require is not defined
at file:///Users/r/Documents/Projects/sandbox/pwd_checker/index.js:2:14
at ModuleJob.run (node:internal/modules/esm/module_job:152:23)
at async Loader.import (node:internal/modules/esm/loader:166:24)
at async exports.handleRequires (/Users/r/Documents/Projects/sandbox/pwd_checker/node_modules/mocha/lib/cli/run-helpers.js:94:28)
at async /Users/r/Documents/Projects/sandbox/pwd_checker/node_modules/mocha/lib/cli/run.js:341:25
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
Node 15.
Remove this line - "type": "module" from package.json and check whether it’s working or not.
Prepend your tests with the following:
import { createRequire } from 'module';
const require = createRequire(import.meta.url);
This is because you cannot require from an ESM module; for more info please see this comment on a nodejs issue.
Documentation: https://nodejs.org/api/esm.html#differences-between-es-modules-and-commonjs

Create React App doesn't properly mock modules from __mocks__ directory

I have a working example with Jest and mocks from __mocks__ directory that works :
With simple Jest setup
// package.json
{
"name": "a",
"version": "1.0.0",
"main": "index.js",
"scripts": {
"test": "jest"
},
...
"devDependencies": {
"jest": "^26.6.3"
},
"dependencies": {
"#octokit/rest": "^18.0.12"
}
}
And then /index.js :
const { Octokit } = require("#octokit/rest");
const octokit = new Octokit();
module.exports.foo = function() {
return octokit.repos.listForOrg({ org: "octokit", type: "public" })
}
with its test (/index.test.js):
const { foo } = require("./index.js");
test("foo should be true", async () => {
expect(await foo()).toEqual([1,2]);
});
and the mock (/__mocks__/#octokit/rest/index.js):
module.exports.Octokit = jest.fn().mockImplementation( () => ({
repos: {
listForOrg: jest.fn().mockResolvedValue([1,2])
}
}) );
This works quite well and tests pass.
With Create React App
However doing the same with Create React App seems to be giving me a weird result:
// package.json
{
"name": "b",
"version": "0.1.0",
"dependencies": {
"#octokit/rest": "^18.0.12",
"#testing-library/jest-dom": "^5.11.4",
"#testing-library/react": "^11.1.0",
"#testing-library/user-event": "^12.1.10",
"react": "^17.0.1",
"react-dom": "^17.0.1",
"react-scripts": "4.0.1",
"web-vitals": "^0.2.4"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject"
},
...
}
And then /src/foo.js:
import { Octokit } from "#octokit/rest";
const octokit = new Octokit();
module.exports.foo = function() {
return octokit.repos.listForOrg({ org: "octokit", type: "public" })
}
with its test (/src/foo.test.js):
const { foo} = require("./foo.js");
test("foo should be true", async () => {
expect(await foo()).toEqual([1,2]);
});
and the very same mock (under /src/__mocks__/#octokit/rest/index.js):
export const Octokit = jest.fn().mockImplementation( () => ({
repos: {
listForOrg: jest.fn().mockResolvedValue([1,2])
}
}) );
This makes the test fail:
FAIL src/foo.test.js
✕ foo should be true (2 ms)
● foo should be true
expect(received).toEqual(expected) // deep equality
Expected: [1, 2]
Received: undefined
2 |
3 | test("foo should be true", async () => {
> 4 | expect(await foo()).toEqual([1,2]);
| ^
5 | });
6 |
7 |
at Object.<anonymous> (src/foo.test.js:4:25)
After reading a lot it seems that I can't make __mocks__ work inside Create React App. What's the problem?
The problem is that CRA's default Jest setup automatically resets the mocks, which removes the mockResolvedValue you set.
One way to solve this, which also gives you more control to have different values in different tests (e.g. to test error handling) and assert on what it was called with, is to expose the mock function from the module too:
export const mockListForOrg = jest.fn();
export const Octokit = jest.fn().mockImplementation(() => ({
repos: {
listForOrg: mockListForOrg,
},
}));
Then you configure the value you want in the test, after Jest would have reset it:
import { mockListForOrg } from "#octokit/rest";
import { foo } from "./foo";
test("foo should be true", async () => {
mockListForOrg.mockResolvedValueOnce([1, 2]);
expect(await foo()).toEqual([1, 2]);
});
Another option is to add the following into your package.json to override that configuration, per this issue:
{
...
"jest": {
"resetMocks": false
}
}
This could lead to issues with mock state (calls received) being retained between tests, though, so you'll need to make sure they're getting cleared and/or reset somewhere.
Note that you generally shouldn't mock what you don't own, though - if the interface to #octokit/rest changes your tests will continue to pass but your code won't work. To avoid this issue, I would recommend either or both of:
Moving the assertions to the transport layer, using e.g. MSW to check that the right request gets made; or
Writing a simple facade that wraps #octokit/rest, decoupling your code from the interface you don't own, and mocking that;
along with higher-level (end-to-end) tests to make sure everything works correctly with the real GitHub API.
In fact, deleting the mocks and writing such a test using MSW:
import { rest } from "msw";
import { setupServer } from "msw/node";
import { foo } from "./foo";
const server = setupServer(rest.get("https://api.github.com/orgs/octokit/repos", (req, res, ctx) => {
return res(ctx.status(200), ctx.json([1, 2]));
}));
beforeAll(() => server.listen());
afterAll(() => server.close());
test("foo should be true", async () => {
expect(await foo()).toEqual([1, 2]);
});
exposes that the current assumption about what octokit.repos.listForOrg would return is inaccurate, because this test fails:
● foo should be true
expect(received).toEqual(expected) // deep equality
Expected: [1, 2]
Received: {"data": [1, 2], "headers": {"content-type": "application/json", "x-powered-by": "msw"}, "status": 200, "url": "https://api.github.com/orgs/octokit/repos?type=public"}
13 |
14 | test("foo should be true", async () => {
> 15 | expect(await foo()).toEqual([1, 2]);
| ^
16 | });
17 |
at Object.<anonymous> (src/foo.test.js:15:25)
Your implementation should actually look something more like:
export async function foo() {
const { data } = await octokit.repos.listForOrg({ org: "octokit", type: "public" });
return data;
}
or:
export function foo() {
return octokit.repos.listForOrg({ org: "octokit", type: "public" }).then(({ data }) => data);
}

React unit test with jest in es6

I am pretty new in react world and trying to write simple friendslist application. I wrote my friends store in es6 style and using babel as transpiler from es5 to es6.
import AppDispatcher from '../dispatcher/app_dispatcher';
import { EventEmitter } from 'events';
import FRIENDS_CONST from '../constants/friends';
const CHANGE_EVENT = 'CHANGE';
let friendsList = [];
let add = (name) => {
let counter = friendsList.length + 1;
let newFriend = {
id: counter,
name: name
};
friendsList.push(newFriend);
}
let remove = (id) => {
let index = friendsList.findIndex(e => e.id == id);
delete friendsList[index];
}
let FriendsStore = Object.assign({}, EventEmitter.prototype, {
getAll: () => {
return friendsList;
},
emitChange: () => {
this.emit(CHANGE_EVENT);
},
addChangeListener: (callback) => {
this.on(CHANGE_EVENT, callback);
},
removeChangeListener: (callback) => {
this.removeListener(CHANGE_EVENT, callback);
}
});
AppDispatcher.register((action) => {
switch (action.actionType) {
case FRIENDS_CONST.ADD_FRIENDS:
add(action.name);
FriendsStore.emitChange();
break;
case FRIENDS_CONST.REMOVE_FRIENDS:
remove(action.id);
FriendsStore.emitChange();
break;
}
});
export default FriendsStore;
Now I want to test my store and wrote the unit test also in es6
jest.dontMock('../../constants/friends');
jest.dontMock('../friends_store');
describe('FriendsStore', () => {
import FRIENDS from '../../constants/friends';
import AppDispatcher from '../../dispatcher/AppDispatcher';
import FriendsStore from '../friends_store';
let FakeAppDispatcher;
let FakeFriendsStore;
let callback;
let addFriends = {
actionType: FRIENDS.ADD_FRIENDS,
name: 'Many'
};
let removeFriend = {
actionType: FRIENDS.REMOVE_FRIENDS,
id: '3'
};
beforeEach(function() {
FakeAppDispatcher = AppDispatcher;
FakeFriendsStore = FriendsStore;
callback = AppDispatcher.register.mock.calls[0][0];
});
it('Should initialize with no friends items', function() {
var all = FriendsStore.getAll();
expect(all).toEqual([]);
});
});
When I execute the test with statement npm test, I've got the error message:
> react-starterify#0.0.9 test /Volumes/Developer/reactjs/app5
> echo "Error: no test specified"
Error: no test specified
What am I doing wrong? The file structure looks as follow:
I did it following the tutorial:
npm install --save-dev jest babel-jest babel-preset-es2015 babel-preset-react react-test-renderer
then
add to package.json
"scripts": {
"test": "jest"
},
"jest": {
"testPathDirs": [
"src/main/resources/web_pages/__tests__"
]
},
Result:
PASS src/main/resources/web_pages/__tests__/modules/utils/ValidationUtil.spec.js (5.214s)
✓ ValidateEmail (5ms)
Test Suites: 1 passed, 1 total
Tests: 1 passed, 1 total
Snapshots: 0 total
Time: 6.092s, estimated 7s
Ran all test suites.
To test ES6 syntax and JSX files, they need to be transformed for Jest. Jest has a config variable where you can define a preprocessor (scriptPreprocessor). You can use the babel-jest preprocessor:
Make the following changes to package.json:
{
"devDependencies": {
"babel-jest": "*",
"jest-cli": "*"
},
"scripts": {
"test": "jest"
},
"jest": {
"scriptPreprocessor": "<rootDir>/node_modules/babel-jest",
"testFileExtensions": ["es6", "js"],
"moduleFileExtensions": ["js", "json", "es6"]
}
}
And run:
$ npm install

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