Remove GUI from solution
MODIFY
HiddenWallet.Tests/HiddenWallet.Tests.csproj
HiddenWallet.Tests/HiddenWallet.Tests.csproj
<TargetFramework>netcoreapp2.0</TargetFramework>
<IsPackable>false</IsPackable>
+
+ <ApplicationIcon />
+
+ <OutputType>Library</OutputType>
+
+ <StartupObject />
</PropertyGroup>
<ItemGroup>

Remove GUI from solution