public void ReturnsPerson_WhenEmailCanBeMatched()
            {
                const string email = "*****@*****.**";
                var query = new GetPersonByEmailQuery
                {
                    Email = email,
                };
                var entities = new Mock<IQueryEntities>(MockBehavior.Strict).Initialize();
                entities.Setup(p => p.Query<Person>()).Returns(new[]
                {
                    new Person
                    {
                        Emails = new[]
                        {
                            new EmailAddress { Value = email }
                        }
                    },
                }.AsQueryable);
                var handler = new GetPersonByEmailHandler(entities.Object);

                var result = handler.Handle(query);

                result.ShouldNotBeNull();
                result.Emails.Count.ShouldEqual(1);
                result.Emails.Single().Value.ShouldEqual(email);
            }
            public void ReturnsNull_WhenEmailCannotBeMatched()
            {
                var query = new GetPersonByEmailQuery();
                var entities = new Mock<IQueryEntities>(MockBehavior.Strict);
                entities.Setup(p => p.Query<Person>()).Returns(new Person[] { }.AsQueryable);
                var handler = new GetPersonByEmailHandler(entities.Object);

                var result = handler.Handle(query);

                result.ShouldBeNull();
            }