Begin porting OpenIdDictServerBuilderTests from 2.x.

- Some tests would not work without the changes to how the Options were retrieved.
- The skipped tests are those that are currently failing on all frameworks.
Will be continuing to try to fix those.
- The commented out tests have compiler errors.
Will need to go through and see which, if any, are still valid.

Related Work Items: openiddict#894

OpenIddict.sln

@@ -100,6 +100,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenIddict.Server.AspNetCor
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenIddict.Server.Owin.IntegrationTests", "test\OpenIddict.Server.Owin.IntegrationTests\OpenIddict.Server.Owin.IntegrationTests.csproj", "{E62124D4-3660-4590-B4D1-787168BBBEDD}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "OpenIddict.Server.Tests", "test\OpenIddict.Server.Tests\OpenIddict.Server.Tests.csproj", "{D94B10D3-3DD3-4829-B305-17C48833AB33}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -234,6 +236,10 @@ Global
 		{E62124D4-3660-4590-B4D1-787168BBBEDD}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{E62124D4-3660-4590-B4D1-787168BBBEDD}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{E62124D4-3660-4590-B4D1-787168BBBEDD}.Release|Any CPU.Build.0 = Release|Any CPU
+		{D94B10D3-3DD3-4829-B305-17C48833AB33}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{D94B10D3-3DD3-4829-B305-17C48833AB33}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{D94B10D3-3DD3-4829-B305-17C48833AB33}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{D94B10D3-3DD3-4829-B305-17C48833AB33}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -271,6 +277,7 @@ Global
 		{0947C388-31DD-45C0-8DD2-61582C648F07} = {5FC71D6A-A994-4F62-977F-88A7D25379D7}
 		{FBFDB9E2-4A44-4B90-B896-E094BFC05C03} = {5FC71D6A-A994-4F62-977F-88A7D25379D7}
 		{E62124D4-3660-4590-B4D1-787168BBBEDD} = {5FC71D6A-A994-4F62-977F-88A7D25379D7}
+		{D94B10D3-3DD3-4829-B305-17C48833AB33} = {5FC71D6A-A994-4F62-977F-88A7D25379D7}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {A710059F-0466-4D48-9B3A-0EF4F840B616}

test/OpenIddict.Server.Tests/OpenIddict.Server.Tests.csproj

@@ -0,0 +1,37 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFrameworks>net461;net472;netcoreapp2.1;netcoreapp3.1</TargetFrameworks>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Moq" Version="4.13.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.4.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\OpenIddict.Abstractions\OpenIddict.Abstractions.csproj" />
+    <ProjectReference Include="..\..\src\OpenIddict.Server\OpenIddict.Server.csproj" />
+  </ItemGroup>
+
+  <ItemGroup Condition=" '$(TargetFramework)' == 'net472' ">
+    <Reference Include="System.Net.Http" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="3.1.0" />
+  </ItemGroup>
+
+  <ItemGroup Condition=" '$(TargetFramework)' == 'netcoreapp2.1' ">
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="2.2.0" />
+  </ItemGroup>
+
+  <ItemGroup Condition=" '$(TargetFramework)' == 'net461' ">
+    <Reference Include="System.Net.Http" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="3.1.0" />
+  </ItemGroup>
+
+  <PropertyGroup Condition=" '$(TargetFramework)' != 'net461' ">
+    <DefineConstants>$(DefineConstants);SUPPORTS_ECDSA</DefineConstants>
+  </PropertyGroup>
+
+</Project>