How to Mock non-default import using Jest
How can I mock a function that is being imported inside the file that contains the function I am testing?
without putting it in the mocks folder.
// FileIWantToTest.js
import { externalFunction } from '../../differentFolder';
export const methodIwantToTest = (x) => { externalFunction(x + 1) }
I need to make sure that externalFunction is called and its called with the correct arguments.
Seems super simple but the documentation doesn't cover how to do this without mocking the module for all the files in the test by putting the mocks in the mocks folder.
javascript unit-testing testing jestjs
edited Nov 13 '18 at 20:32
skyboyer
3,48611128
asked Nov 13 '18 at 19:17
OsurielOsuriel
233
add a comment |
How can I mock a function that is being imported inside the file that contains the function I am testing?
without putting it in the mocks folder.
// FileIWantToTest.js
import { externalFunction } from '../../differentFolder';
export const methodIwantToTest = (x) => { externalFunction(x + 1) }
I need to make sure that externalFunction is called and its called with the correct arguments.
Seems super simple but the documentation doesn't cover how to do this without mocking the module for all the files in the test by putting the mocks in the mocks folder.
javascript unit-testing testing jestjs
edited Nov 13 '18 at 20:32
skyboyer
3,48611128
asked Nov 13 '18 at 19:17
OsurielOsuriel
233
add a comment |
How can I mock a function that is being imported inside the file that contains the function I am testing?
without putting it in the mocks folder.
// FileIWantToTest.js
import { externalFunction } from '../../differentFolder';
export const methodIwantToTest = (x) => { externalFunction(x + 1) }
I need to make sure that externalFunction is called and its called with the correct arguments.
Seems super simple but the documentation doesn't cover how to do this without mocking the module for all the files in the test by putting the mocks in the mocks folder.
javascript unit-testing testing jestjs
edited Nov 13 '18 at 20:32
skyboyer
3,48611128
asked Nov 13 '18 at 19:17
OsurielOsuriel
233
How can I mock a function that is being imported inside the file that contains the function I am testing?
without putting it in the mocks folder.
// FileIWantToTest.js
import { externalFunction } from '../../differentFolder';
export const methodIwantToTest = (x) => { externalFunction(x + 1) }
I need to make sure that externalFunction is called and its called with the correct arguments.
Seems super simple but the documentation doesn't cover how to do this without mocking the module for all the files in the test by putting the mocks in the mocks folder.
javascript unit-testing testing jestjs
javascript unit-testing testing jestjs
edited Nov 13 '18 at 20:32
skyboyer
3,48611128
asked Nov 13 '18 at 19:17
OsurielOsuriel
233
edited Nov 13 '18 at 20:32
skyboyer
3,48611128
asked Nov 13 '18 at 19:17
OsurielOsuriel
233
edited Nov 13 '18 at 20:32
skyboyer
3,48611128
edited Nov 13 '18 at 20:32
skyboyer
3,48611128
edited Nov 13 '18 at 20:32
skyboyer
3,48611128
3,48611128
asked Nov 13 '18 at 19:17
OsurielOsuriel
233
asked Nov 13 '18 at 19:17
OsurielOsuriel
233
asked Nov 13 '18 at 19:17
OsurielOsuriel
233
233
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
The solution: I need to take my jest.mock call outside of any test or any other function because jest needs to hoist it. Also for named exports like in my case I also have to use the following syntax:
jest.mock('../../differentFolder', () => ({
__esModule: true,
externalFunction: jest.fn(),
}));
answered Nov 13 '18 at 21:13
OsurielOsuriel
233
add a comment |
One of the easiest approaches is to import the library and use jest.spyOn to spy on the method:
import { methodIwantToTest } from './FileIWantToTest';
import * as lib from '../../differentFolder'; // import the library containing externalFunction
test('methodIwantToTest', () => {
const spy = jest.spyOn(lib, 'externalFunction'); // spy on externalFunction
methodIwantToTest(1);
expect(spy).toHaveBeenCalledWith(2); // SUCCESS
});
answered Nov 14 '18 at 2:43
brian-lives-outdoorsbrian-lives-outdoors
5,245322
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53288067%2fhow-to-mock-non-default-import-using-jest%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
The solution: I need to take my jest.mock call outside of any test or any other function because jest needs to hoist it. Also for named exports like in my case I also have to use the following syntax:
jest.mock('../../differentFolder', () => ({
__esModule: true,
externalFunction: jest.fn(),
}));
answered Nov 13 '18 at 21:13
OsurielOsuriel
233
add a comment |
The solution: I need to take my jest.mock call outside of any test or any other function because jest needs to hoist it. Also for named exports like in my case I also have to use the following syntax:
jest.mock('../../differentFolder', () => ({
__esModule: true,
externalFunction: jest.fn(),
}));
answered Nov 13 '18 at 21:13
OsurielOsuriel
233
add a comment |
The solution: I need to take my jest.mock call outside of any test or any other function because jest needs to hoist it. Also for named exports like in my case I also have to use the following syntax:
jest.mock('../../differentFolder', () => ({
__esModule: true,
externalFunction: jest.fn(),
}));
answered Nov 13 '18 at 21:13
OsurielOsuriel
233
The solution: I need to take my jest.mock call outside of any test or any other function because jest needs to hoist it. Also for named exports like in my case I also have to use the following syntax:
jest.mock('../../differentFolder', () => ({
__esModule: true,
externalFunction: jest.fn(),
}));
answered Nov 13 '18 at 21:13
OsurielOsuriel
233
answered Nov 13 '18 at 21:13
OsurielOsuriel
233
answered Nov 13 '18 at 21:13
OsurielOsuriel
233
answered Nov 13 '18 at 21:13
OsurielOsuriel
233
233
add a comment |
add a comment |
One of the easiest approaches is to import the library and use jest.spyOn to spy on the method:
import { methodIwantToTest } from './FileIWantToTest';
import * as lib from '../../differentFolder'; // import the library containing externalFunction
test('methodIwantToTest', () => {
const spy = jest.spyOn(lib, 'externalFunction'); // spy on externalFunction
methodIwantToTest(1);
expect(spy).toHaveBeenCalledWith(2); // SUCCESS
});
answered Nov 14 '18 at 2:43
brian-lives-outdoorsbrian-lives-outdoors
5,245322
add a comment |
One of the easiest approaches is to import the library and use jest.spyOn to spy on the method:
import { methodIwantToTest } from './FileIWantToTest';
import * as lib from '../../differentFolder'; // import the library containing externalFunction
test('methodIwantToTest', () => {
const spy = jest.spyOn(lib, 'externalFunction'); // spy on externalFunction
methodIwantToTest(1);
expect(spy).toHaveBeenCalledWith(2); // SUCCESS
});
answered Nov 14 '18 at 2:43
brian-lives-outdoorsbrian-lives-outdoors
5,245322
add a comment |
One of the easiest approaches is to import the library and use jest.spyOn to spy on the method:
import { methodIwantToTest } from './FileIWantToTest';
import * as lib from '../../differentFolder'; // import the library containing externalFunction
test('methodIwantToTest', () => {
const spy = jest.spyOn(lib, 'externalFunction'); // spy on externalFunction
methodIwantToTest(1);
expect(spy).toHaveBeenCalledWith(2); // SUCCESS
});
answered Nov 14 '18 at 2:43
brian-lives-outdoorsbrian-lives-outdoors
5,245322
One of the easiest approaches is to import the library and use jest.spyOn to spy on the method:
import { methodIwantToTest } from './FileIWantToTest';
import * as lib from '../../differentFolder'; // import the library containing externalFunction
test('methodIwantToTest', () => {
const spy = jest.spyOn(lib, 'externalFunction'); // spy on externalFunction
methodIwantToTest(1);
expect(spy).toHaveBeenCalledWith(2); // SUCCESS
});
answered Nov 14 '18 at 2:43
brian-lives-outdoorsbrian-lives-outdoors
5,245322
answered Nov 14 '18 at 2:43
brian-lives-outdoorsbrian-lives-outdoors
5,245322
answered Nov 14 '18 at 2:43
brian-lives-outdoorsbrian-lives-outdoors
5,245322
answered Nov 14 '18 at 2:43
brian-lives-outdoorsbrian-lives-outdoors
5,245322
5,245322
add a comment |
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53288067%2fhow-to-mock-non-default-import-using-jest%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
