Mocking store.dispatch in Jest with TypeScript did not result in any function calls being made

Testing Troubles

I'm a beginner in the world of testing and I'm facing some challenges. Despite going through all the documentation on jest, I couldn't find information specific to TypeScript cases. Currently, I'm on a quest to figure things out and learn as much as I can. My goal is to create a simple test to verify if my code functions as expected.

jest.mock('moment', () => {
    return {
        toLocaleString: jest.fn().mockReturnValue('test')
    }
});
...

The issue I'm encountering can be seen https://i.stack.imgur.com/JzlTp.png

I'm determined to unravel this puzzle and improve my understanding of testing methodologies and best practices.

typescriptunit-testingjestjs

Answer №1

I discovered the solution...

describe('triggerSnackBar', () => {
    let spy: any
    beforeEach(() => {
        spy = jest.spyOn(store, 'dispatch');
    })
    afterEach(() => {
        jest.clearAllMocks()
    })
    it('should trigger dispatch function 3 times successfully', () => {
        globalMixins.methods.triggerSnackBar('test', 'green')
        expect(store.dispatch).toBeCalledTimes(3)
    });
    it('should have been called with accurate parameters', () => {
        globalMixins.methods.triggerSnackBar('test', 'green')
        expect(store.dispatch).nthCalledWith(1, 'triggerSnackbarMessage', { text: 'test' })
        expect(store.dispatch).nthCalledWith(2, 'triggerSnackbarColor', { color: 'green' })
        expect(store.dispatch).nthCalledWith(3, 'triggerSnackbar')
    })
});

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