Jest: Override module function in a test after calling jest.mock()

[golankiviti]

Hi,

I have a react component that uses functions from a module to fetch data and I want to mock it, so I used the jest.mock in order to so and it worked. But I've reached a point in my test where I want to override one of the functions in the mock module and I can't find a way to achieve it.

For example:

moduleName.js
export const a = () => 1;
export const b = () => 2;

__mocks__/moduleName.js
export const a = () => 3;
export const b = () => 4;

moduleName.test.js

jest.mock('moduleName);

describe('Test block', () => {
    it('First test that uses the react component', () => {
        some code that with mount the component.
        here if the component will call the a function from the module it will receive the value 3(from the         
        mock).
    })

    it('Second test the uses the react component', () => {
        here I want to override the a function to return the value 8 in the mock.
        But if I mount the component it will still call the a function and will receive the value 3.
    })
})

How can I achieve that? I tried jest.doMock but it doesnt override the jest.mock

[SimenB]

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[amiral-jion]

just in case someone needs this in the future, you can use the second parameter in the jest.mock to do that.
https://jestjs.io/docs/en/jest-object#jestmockmodulename-factory-options