public void EmptyParameter_ShouldReturn_StringMessage()
            {
                MediaServices dbs  = new MediaServices();
                var           toto = new Media();

                // Tests des exceptions
                dbs.Invoking(d => dbs.AddMedia(toto)).Should().NotThrow();
                try
                {
                    var res = dbs.AddMedia(toto);
                    res.Should().NotBeNull(res);
                    res.Should().Be("the media have empty parameter");
                }
                catch (Exception e)
                {
                    throw e;
                }
            }
            public void NullMedia_Return_StringMessage()
            {
                MediaServices dbs = new MediaServices();

                // Tests des exceptions
                dbs.Invoking(d => dbs.AddMedia(null)).Should().NotThrow();

                try
                {
                    var res = dbs.AddMedia(null);

                    res.Should().NotBeNull(res);
                    res.Should().Be("the media is null");
                }
                catch (Exception e)
                {
                    throw e;
                }
            }