public void Test_for_AcceptProposal()
        {
            User user = new User()
            {
                Id = 1,
            };

            var Acceptproposal = Mentor_service.AcceptProposal(user.Id);

            Assert.True(Acceptproposal);
        }
        public void ExceptionTestForAcceptProposal()
        {
            //Arrange
            User user = new User()
            {
                Id = 1
            };


            var ex = Assert.Throws <ExceptionForRejectProposal>(() => Mentor_service.AcceptProposal(user.Id));

            Assert.Equal("Rejected the Proposal", ex.Message);
        }