Verify that Welcome and Cancelation email methods have been called

[canyener]

I'm mocking the sendgrid library but not verifying the email sending methods have been called in my endpoints.

Should I verify these methods?
POST /users -> sendWelcomeEmail should have been called (Not certain about this)
DELETE /users/me -> sendCancelationEmail should have been called (Not certain about this)

[canyener]

jest.spyOn(object, methodName) could help