public async void GetContactByIdQueryTest() { //Arange var testHelper = new TestHelper(); var contact = Contact.Create("someone", "*****@*****.**", "156464654", null, testHelper.contactsContext); await testHelper.contactsContext.AddAsync(contact); await testHelper.contactsContext.SaveChangesAsync(); GetContactByIdQuery query = new GetContactByIdQuery(contact.Id); GetContactByIdQueryHandler handler = new GetContactByIdQueryHandler(testHelper.contactsContext); //Act var result = await handler.Handle(query, default); //Asert result.Should().NotBeNull(); result.FullName.Should().Be("someone"); }