Started implementation

Started implementation

UnitsNet.Serialization.SystemTextJson.Tests/Infrastructure/TestObject.cs

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+// Licensed under MIT No Attribution, see LICENSE file at the root.
+// Copyright 2013 Andreas Gullberg Larsen (andreas.larsen84@gmail.com). Maintained at https://github.com/angularsen/UnitsNet.
+
+namespace UnitsNet.Serialization.SystemTextJson.Tests.Infrastructure
+{
+    public sealed class TestObject
+    {
+        public Frequency? NullableFrequency { get; set; }
+        public Frequency NonNullableFrequency { get; set; }
+    }
+}

UnitsNet.Serialization.SystemTextJson.Tests/Infrastructure/TestObjectWithIComparable.cs

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+// Licensed under MIT No Attribution, see LICENSE file at the root.
+// Copyright 2013 Andreas Gullberg Larsen (andreas.larsen84@gmail.com). Maintained at https://github.com/angularsen/UnitsNet.
+
+using System;
+
+namespace UnitsNet.Serialization.SystemTextJson.Tests.Infrastructure
+{
+    public sealed class TestObjectWithIComparable
+    {
+        public IComparable Value { get; set; }
+    }
+}

UnitsNet.Serialization.SystemTextJson.Tests/Infrastructure/TestObjectWithThreeIComparable.cs

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+// Licensed under MIT No Attribution, see LICENSE file at the root.
+// Copyright 2013 Andreas Gullberg Larsen (andreas.larsen84@gmail.com). Maintained at https://github.com/angularsen/UnitsNet.
+
+using System;
+
+namespace UnitsNet.Serialization.SystemTextJson.Tests.Infrastructure
+{
+    public sealed class TestObjectWithThreeIComparable
+    {
+        public IComparable Value1 { get; set; }
+
+        public IComparable Value2 { get; set; }
+
+        public IComparable Value3 { get; set; }
+    }
+}

UnitsNet.Serialization.SystemTextJson.Tests/Infrastructure/TestObjectWithValueAndUnitAsIComparable.cs

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+// Licensed under MIT No Attribution, see LICENSE file at the root.
+// Copyright 2013 Andreas Gullberg Larsen (andreas.larsen84@gmail.com). Maintained at https://github.com/angularsen/UnitsNet.
+
+using System;
+
+namespace UnitsNet.Serialization.SystemTextJson.Tests.Infrastructure
+{
+    public sealed class TestObjectWithValueAndUnitAsIComparable : IComparable
+    {
+        public double Value { get; set; }
+        public string Unit { get; set; }
+
+        public int CompareTo(object obj)
+        {
+            return ((IComparable)Value).CompareTo(obj);
+        }
+    }
+}

UnitsNet.Serialization.SystemTextJson.Tests/Infrastructure/TestObjectWithValueAsIComparable.cs

@@ -0,0 +1,32 @@
+// Licensed under MIT No Attribution, see LICENSE file at the root.
+// Copyright 2013 Andreas Gullberg Larsen (andreas.larsen84@gmail.com). Maintained at https://github.com/angularsen/UnitsNet.
+
+using System;
+
+namespace UnitsNet.Serialization.SystemTextJson.Tests.Infrastructure
+{
+    public sealed class TestObjectWithValueAsIComparable : IComparable
+    {
+        public int Value { get; set; }
+
+        public int CompareTo(object obj)
+        {
+            return ((IComparable)Value).CompareTo(obj);
+        }
+
+        // Needed for verifying that the deserialized object is the same, should not affect the serialization code
+        public override bool Equals(object obj)
+        {
+            if (obj == null || GetType() != obj.GetType())
+            {
+                return false;
+            }
+            return Value.Equals(((TestObjectWithValueAsIComparable)obj).Value);
+        }
+
+        public override int GetHashCode()
+        {
+            return Value.GetHashCode();
+        }
+    }
+}

UnitsNet.Serialization.SystemTextJson.Tests/Infrastructure/UnitsNetJsonBaseTest.cs

@@ -0,0 +1,29 @@
+// Licensed under MIT No Attribution, see LICENSE file at the root.
+// Copyright 2013 Andreas Gullberg Larsen (andreas.larsen84@gmail.com). Maintained at https://github.com/angularsen/UnitsNet.
+
+using System.Text.Json;
+
+namespace UnitsNet.Serialization.SystemTextJson.Tests.Infrastructure
+{
+    public abstract class UnitsNetJsonBaseTest
+    {
+        private readonly JsonSerializerOptions _jsonSerializerSettings;
+
+        protected UnitsNetJsonBaseTest()
+        {
+            _jsonSerializerSettings = new JsonSerializerOptions {WriteIndented = true};
+            _jsonSerializerSettings.Converters.Add(new UnitsNetJsonConverterFactory());
+            //_jsonSerializerSettings.Converters.Add(new UnitsNetIQuantityJsonConverter());
+            //_jsonSerializerSettings.Converters.Add(new UnitsNetIComparableJsonConverter());
+        }
+
+        protected string SerializeObject(object obj)
+        {
+            return JsonSerializer.Serialize(obj, _jsonSerializerSettings).Replace("\r\n", "\n");
+        }
+
+        protected T DeserializeObject<T>(string json)
+        { return JsonSerializer.Deserialize<T>(json, _jsonSerializerSettings);
+        }
+    }
+}

UnitsNet.Serialization.SystemTextJson.Tests/TestObject.cs

@@ -0,0 +1,8 @@
+namespace UnitsNet.Serialization.SystemTextJson.Tests
+{
+    public sealed class TestObject
+    {
+        public Frequency? NullableFrequency { get; set; }
+        public Frequency NonNullableFrequency { get; set; }
+    }
+}

UnitsNet.Serialization.SystemTextJson.Tests/UnitsNet.Serialization.SystemTextJson.Tests.csproj

@@ -0,0 +1,27 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net5.0</TargetFramework>
+
+        <IsPackable>false</IsPackable>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.7.1" />
+        <PackageReference Include="xunit" Version="2.4.1" />
+        <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
+            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+            <PrivateAssets>all</PrivateAssets>
+        </PackageReference>
+        <PackageReference Include="coverlet.collector" Version="1.3.0">
+            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+            <PrivateAssets>all</PrivateAssets>
+        </PackageReference>
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\UnitsNet.Serialization.SystemTextJson\UnitsNet.Serialization.SystemTextJson.csproj" />
+      <ProjectReference Include="..\UnitsNet\UnitsNet.csproj" />
+    </ItemGroup>
+
+</Project>

UnitsNet.Serialization.SystemTextJson.Tests/UnitsNetJsonBaseTest.cs

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+using System.Text.Json;
+
+namespace UnitsNet.Serialization.SystemTextJson.Tests
+{
+    public abstract class UnitsNetJsonBaseTest
+    {
+        private readonly JsonSerializerOptions _jsonSerializerSettings;
+
+        protected UnitsNetJsonBaseTest()
+        {
+            _jsonSerializerSettings = new JsonSerializerOptions {WriteIndented = true};
+            _jsonSerializerSettings.Converters.Add(new UnitsNetJsonConverterFactory());
+            //_jsonSerializerSettings.Converters.Add(new UnitsNetIQuantityJsonConverter());
+            //_jsonSerializerSettings.Converters.Add(new UnitsNetIComparableJsonConverter());
+        }
+
+        protected string SerializeObject(object obj)
+        {
+            return JsonSerializer.Serialize(obj, _jsonSerializerSettings).Replace("\r\n", "\n");
+        }
+
+        protected T DeserializeObject<T>(string json)
+        { return JsonSerializer.Deserialize<T>(json, _jsonSerializerSettings);
+        }
+    }
+}