public void Handler_ReturnsNull_WhenUserById_DoesNotExist()
{
const int userId = 456;
var query = new ClientCookieBy(userId);
var queries = new Mock <IProcessQueries>(MockBehavior.Strict);
Expression <Func <UserBy, bool> > expectedQuery = x => x.Id == query.UserId;
queries.Setup(x => x.Execute(It.Is(expectedQuery))).Returns(Task.FromResult(null as User));
var handler = new HandleClientCookieByQuery(queries.Object);
ClientCookie result = handler.Handle(query).Result;
result.ShouldBeNull();
queries.Verify(x => x.Execute(It.Is(expectedQuery)), Times.Once);
}
