Umbraco-CMS/tests/Umbraco.Tests.UnitTests/Umbraco.Infrastructure/Serialization/AutoInterningStringConverterTests.cs

using Newtonsoft.Json;
using NUnit.Framework;
using System;
using System.Collections.Generic;
using System.Linq;
using Umbraco.Cms.Infrastructure.Serialization;

namespace Umbraco.Cms.Tests.UnitTests.Umbraco.Infrastructure.Serialization
{
    [TestFixture]
    public class AutoInterningStringConverterTests
    {
        [Test]
        public void Intern_Property_String()
        {
            var str1 = "Hello";
            var obj = new Test
            {
                Name = str1 + Guid.NewGuid()
            };

            // ensure the raw value is not interned
            Assert.IsNull(string.IsInterned(obj.Name));

            var serialized = JsonConvert.SerializeObject(obj);
            obj = JsonConvert.DeserializeObject<Test>(serialized);

            Assert.IsNotNull(string.IsInterned(obj.Name));
        }

        [Test]
        public void Intern_Property_Dictionary()
        {
            var str1 = "key";
            var obj = new Test
            {
                Values = new Dictionary<string, int>
                {
                    [str1 + Guid.NewGuid()] = 0,
                    [str1 + Guid.NewGuid()] = 1
                }
            };

            // ensure the raw value is not interned
            Assert.IsNull(string.IsInterned(obj.Values.Keys.First()));
            Assert.IsNull(string.IsInterned(obj.Values.Keys.Last()));

            var serialized = JsonConvert.SerializeObject(obj);
            obj = JsonConvert.DeserializeObject<Test>(serialized);

            Assert.IsNotNull(string.IsInterned(obj.Values.Keys.First()));
            Assert.IsNotNull(string.IsInterned(obj.Values.Keys.Last()));
        }

        public class Test
        {
            [JsonConverter(typeof(AutoInterningStringConverter))]
            public string Name { get; set; }

            [JsonConverter(typeof(AutoInterningStringKeyCaseInsensitiveDictionaryConverter<int>))]
            public Dictionary<string, int> Values { get; set; } = new Dictionary<string, int>();
        }
    }
}