[Vuejs]-SpyOn question regarding function that return promise

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Because your original method returns a promise, and your spy is also returning a promise (even an already resolved) you should use the then or the async await as you commented in the question.

So, the other way of doing is:

it('should set X', (done) => {
    vm.getSomething().then(() => {
        expect(vm.X).toBe(X);
        done();
    });
})

Using the done parameter from jasmine to notify this unit test is asynchronous and will complete when this callback is called.

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i know it’s a little bit too late and you probably already found a solution, but in case you didn’t i think that the solution i will propose will work for you. You can use the combination of fakeAsync and tick to test your asynchronous function, bellow is my solution.

describe('test', () => {
             ...
             it('should set X', fakeAsync(() =>{
               vm.getSomething();
               tick();
               expect(vm.X).toBe(X);
             }));
             ...
}

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