I'm trying to refactor some unit tests but found that expect inside a loop doesn't work. I'm looping through an enum. I have the following code:
Are there any solutions or workarounds?
it('should block approval of ads if status is not in pending revision', async () => {
mockAdsRepository.findOne = jest.fn(() =>
Promise.resolve({ ...adsDto, status: Status.REJECTED }),
);
await expect(service.approve(1, 1)).rejects.toThrow(BadRequestException);
mockAdsRepository.findOne = jest.fn(() =>
Promise.resolve({ ...adsDto, status: Status.UNPUBLISH }),
);
await expect(service.approve(1, 1)).rejects.toThrow(BadRequestException);
// error trigger, working
// mockAdsRepository.findOne = jest.fn(() =>
// Promise.resolve({ ...adsDto, status: Status.PENDING_REVISION }),
// );
// await expect(service.approve(1, 1)).rejects.toThrow(BadRequestException);
//refactor
Object.keys(Status).map(async (key) => {
if (Status[key] !== Status./*changing this value for error triggers not working*/ ) {
mockAdsRepository.findOne = jest.fn(() =>
Promise.resolve({ ...adsDto, status: Status[key] }),
);
await expect(service.approve(1, 1)).rejects.toThrow(
BadRequestException,
);
}
});
}); 
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I think, in your case the problem is that map doesn't handle asynchronous operations, so at the end of the loop there are several promises in a pending state. You should wait for all promises in the map to be resolved/rejected.
You can use this function to handle all promises.
export async function mapAsync<T, R>( elements: Promise<T>[] | T[], mapAction: (arg: T) => Promise<R>, ): Promise<R[]> { const results: R[] = []; for (const element of await Promise.all(elements)) { const mappedItem = await mapAction(element); results.push(mappedItem); } return results; }