CheckMarxMapping.Test.CheckMarxMapping.DataItems_Are_Not_Duplicated C# (CSharp) Method

        public void DataItems_Are_Not_Duplicated()
        {
            var DataMapping = new CheckMarxDataMapping {Mapping = GetData()};
            List<DataItem> mapping = DataMapping.Mapping;

            int filteredResults = mapping.GroupBy(x => x.QueryId)
                                         .Where(group => group.Count() > 1)
                                         .Select(group => group.Key).Count();

            //FilteredResults equals 0 means that there are not duplicated
            Assert.IsTrue(filteredResults.notNull());
            Assert.IsTrue(filteredResults == 0);
        }