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can you mock functions from a module? #223

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sunnz opened this issue Jan 14, 2022 · 0 comments

sunnz commented Jan 14, 2022 •

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looking to mock a function (foo) imported from a module (../foo), for example when using jest:

jest.mock('../foo'); // this happens automatically with automocking
const foo = require('../foo');

// foo is a mock function
foo.mockImplementation(() => 42);
foo();
// > 42

see https://jestjs.io/docs/mock-functions#mock-implementations

I am doing this for an existing codebase that uses ts-mockito, so don't want to throw jest into the mix. :)

sunnz changed the title ~~can you mock modules and functions?~~ can you mock funcitons from a module?

sunnz changed the title ~~can you mock funcitons from a module?~~ can you mock functions from a module?

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