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
3,54111128
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
3,54111128
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
3,54111128
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
3,54111128
asked Nov 13 '18 at 19:17
OsurielOsuriel
233
edited Nov 13 '18 at 20:32
skyboyer
3,54111128
asked Nov 13 '18 at 19:17
OsurielOsuriel
233
edited Nov 13 '18 at 20:32
skyboyer
3,54111128
edited Nov 13 '18 at 20:32
skyboyer
3,54111128
edited Nov 13 '18 at 20:32
skyboyer
3,54111128
3,54111128
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
5,3951322
add a comment |
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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
5,3951322
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
5,3951322
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
5,3951322
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
5,3951322
answered Nov 14 '18 at 2:43
brian-lives-outdoorsbrian-lives-outdoors
5,3951322
answered Nov 14 '18 at 2:43
brian-lives-outdoorsbrian-lives-outdoors
5,3951322
answered Nov 14 '18 at 2:43
brian-lives-outdoorsbrian-lives-outdoors
5,3951322
5,3951322
add a comment |
add a comment |
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