I have a function that saves an entity and in the promise i want to check the delete is called.
In my jest test it whizzes past and can’t think how to test it
Here is the partial snippets, it all works, Promises called etc. just can’t figure how to test that ‘deleteMessage’ is called
this.service .save(entity) .then(() => { this.sqsQueue.deleteMessage(message.ReceiptHandle!); }) .catch((error) => { this.log.error('Error saving'); });
In my test i use
service.save = jest.fn().mockResolvedValue(null); expect(sqsQueue.deleteMessage).toHaveBeenNthCalledWith( 1, deleteItem1.ReceiptHandle );
As mentioned because it’s a Promise, the test doesn’t wait for the save and and runs the expect which of course fails because the function has not run yet.
Advertisement
Answer
test('item is deleted', () => { return service.save().then(() => { // Put your expects here }); });
For more info see the docs: https://jestjs.io/docs/en/asynchronous