Improvements in unit tests

- Move encoding unit tests to separate project (where in StringBuilder one which was hindeing discovery).
- Add new enconding/deconding unit tests (following #237)

Author: josesimoes

Tests/NFUnitTestEncoding/EncodingTests.cs

@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="Current" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup Label="Globals">
+    <NanoFrameworkProjectSystemPath>$(MSBuildExtensionsPath)\nanoFramework\v1.0\</NanoFrameworkProjectSystemPath>
+  </PropertyGroup>
+  <Import Project="$(NanoFrameworkProjectSystemPath)NFProjectSystem.Default.props" Condition="Exists('$(NanoFrameworkProjectSystemPath)NFProjectSystem.Default.props')" />
+  <ItemGroup>
+    <ProjectCapability Include="TestContainer" />
+  </ItemGroup>
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectTypeGuids>{11A8DD76-328B-46DF-9F39-F559912D0360};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <ProjectGuid>5cc54ee8-8145-4b94-adf0-cd0879fcdf7d</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <FileAlignment>512</FileAlignment>
+    <RootNamespace>NFUnitTestEncoding</RootNamespace>
+    <AssemblyName>NFUnitTest</AssemblyName>
+    <IsCodedUITest>False</IsCodedUITest>
+    <IsTestProject>true</IsTestProject>
+    <TestProjectType>UnitTest</TestProjectType>
+    <TargetFrameworkVersion>v1.0</TargetFrameworkVersion>
+  </PropertyGroup>
+  <Import Project="$(NanoFrameworkProjectSystemPath)NFProjectSystem.props" Condition="Exists('$(NanoFrameworkProjectSystemPath)NFProjectSystem.props')" />
+  <ItemGroup>
+    <Compile Include="EncodingTests.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <Reference Include="mscorlib">
+      <HintPath>..\..\packages\nanoFramework.CoreLibrary.1.17.11\lib\mscorlib.dll</HintPath>
+    </Reference>
+    <Reference Include="nanoFramework.TestFramework">
+      <HintPath>..\..\packages\nanoFramework.TestFramework.3.0.77\lib\nanoFramework.TestFramework.dll</HintPath>
+    </Reference>
+    <Reference Include="nanoFramework.UnitTestLauncher">
+      <HintPath>..\..\packages\nanoFramework.TestFramework.3.0.77\lib\nanoFramework.UnitTestLauncher.exe</HintPath>
+    </Reference>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\..\nanoFramework.System.Text\nanoFramework.System.Text.nfproj" />
+  </ItemGroup>
+  <Import Project="$(NanoFrameworkProjectSystemPath)NFProjectSystem.CSharp.targets" Condition="Exists('$(NanoFrameworkProjectSystemPath)NFProjectSystem.CSharp.targets')" />
+</Project>

Tests/NFUnitTestEncoding/NFUnitTestEncoding.nfproj

@@ -0,0 +1,31 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyCopyright("Copyright (c) 2021 nanoFramework contributors")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

Tests/NFUnitTestEncoding/Properties/AssemblyInfo.cs

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="nanoFramework.CoreLibrary" version="1.17.11" targetFramework="netnano1.0" />
+  <package id="nanoFramework.TestFramework" version="3.0.77" targetFramework="netnano1.0" developmentDependency="true" />
+</packages>

Tests/NFUnitTestEncoding/packages.config

@@ -0,0 +1,19 @@
+{
+  "version": 1,
+  "dependencies": {
+    ".NETnanoFramework,Version=v1.0": {
+      "nanoFramework.CoreLibrary": {
+        "type": "Direct",
+        "requested": "[1.17.11, 1.17.11]",
+        "resolved": "1.17.11",
+        "contentHash": "HezzAc0o2XrSGf85xSeD/6xsO6ohF9hX6/iMQ1IZS6Zw6umr4WfAN2Jv0BrPxkaYwzEegJxxZujkHoUIAqtOMw=="
+      },
+      "nanoFramework.TestFramework": {
+        "type": "Direct",
+        "requested": "[3.0.77, 3.0.77]",
+        "resolved": "3.0.77",
+        "contentHash": "Py5W1oN84KMBmOOHCzdz6pyi3bZTnQu9BoqIx0KGqkhG3V8kGoem/t+BuCM0pMIWAyl2iMP1n2S9624YXmBJZw=="
+      }
+    }
+  }
+}

Tests/NFUnitTestEncoding/packages.lock.json

@@ -26,7 +26,6 @@
   </PropertyGroup>
   <Import Project="$(NanoFrameworkProjectSystemPath)NFProjectSystem.props" Condition="Exists('$(NanoFrameworkProjectSystemPath)NFProjectSystem.props')" />
   <ItemGroup>
-    <Compile Include="EncodingTests.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="StringBuilderTests.cs" />
   </ItemGroup>