public void CheckIfUserExists_IfExists_ReturnsTrue()
        {
            var mockSet     = new Mock <DbSet <Users> >();
            var mockContext = new Mock <FoodfeedbackDBContext>();

            mockContext.Setup(c => c.Users).Returns(mockSet.Object);
            var service  = new Loginservice(mockContext.Object);
            var response = service.CheckIfUserExists(new UserDTO()
            {
                Email    = "*****@*****.**",
                Password = "******"
            });

            Assert.IsAssignableFrom <int>(response);
        }