Changes the interface to be private and adds an assemblyinfo file tha…

…t exposes it to the tests project. Also now signs the test project.

src/Microsoft.FeatureManagement/AssemblyInfo.cs

@@ -0,0 +1,12 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+//
+using System.Runtime.CompilerServices;
+
+// Tests
+[assembly: InternalsVisibleTo("Tests.FeatureManagement,PublicKey=" +
+"0024000004800000940000000602000000240000525341310004000001000100895524f60b44ff" +
+"3ae70fbea5662f61dd9d640de2205b7bd5359a43dda006e51d83d1f5f7a7d3f849267a0a28676d" +
+"cf49727a32487d4c75c4aacd5febb0069e1adc66ec63bbd18ec2276091a0e3c1326aa626c9e4db" +
+"800714a134f2a81e405f35752b55220021923429cb61776cd2fa66d25c335f8dc27bb92292905a" +
+"3798d896")]

src/Microsoft.FeatureManagement/IFeatureDefinitionProviderCacheable.cs

@@ -1,10 +1,13 @@
-using System;
-using System.Collections.Generic;
-using System.Text;
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+//
 
 namespace Microsoft.FeatureManagement
 {
-    public interface IFeatureDefinitionProviderCacheable
+    /// <summary>
+    /// An interface that marks this provider's parameters are cacheable.
+    /// </summary>
+    internal interface IFeatureDefinitionProviderCacheable
     {
     }
 }

tests/Tests.FeatureManagement/Tests.FeatureManagement.csproj

@@ -4,6 +4,8 @@
     <TargetFrameworks>netcoreapp2.1;netcoreapp3.1;net5.0;net6.0</TargetFrameworks>
     <IsPackable>false</IsPackable>
     <LangVersion>8.0</LangVersion>
+    <SignAssembly>True</SignAssembly>
+    <AssemblyOriginatorKeyFile>..\..\build\Microsoft.FeatureManagement.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
 
   <ItemGroup>