Add test projects for resolved code

src/Connected.Entities.Tests/Connected.Entities.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.2" />
+    <PackageReference Include="MSTest.TestAdapter" Version="2.2.10" />
+    <PackageReference Include="MSTest.TestFramework" Version="2.2.10" />
+    <PackageReference Include="coverlet.collector" Version="3.1.2" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Connected.Entities\Connected.Entities.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Folder Include="Caching\" />
+  </ItemGroup>
+
+</Project>

src/Connected.Entities.Tests/Usings.cs

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+global using Microsoft.VisualStudio.TestTools.UnitTesting;

src/Connected.Expressions.Tests/Connected.Expressions.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.2" />
+    <PackageReference Include="MSTest.TestAdapter" Version="2.2.10" />
+    <PackageReference Include="MSTest.TestFramework" Version="2.2.10" />
+    <PackageReference Include="coverlet.collector" Version="3.1.2" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Connected.Expressions\Connected.Expressions.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Folder Include="Translation\" />
+  </ItemGroup>
+
+</Project>

src/Connected.Expressions.Tests/Usings.cs

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+global using Microsoft.VisualStudio.TestTools.UnitTesting;