Add regression test

Author: kg

src/tests/Regressions/coreclr/103365/103365.cs

@@ -0,0 +1,51 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+/*
+https://github.com/dotnet/runtime/issues/103365
+When using an interface with a generic out type, an explicit implementation, and a derived class, the base classes implementation is called instead of the derived class when running on Android. Running on Windows yields the expected behavior.
+*/
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+using Xunit;
+
+public interface IBaseInterface<out T>
+{
+    string explicitDeclaration();
+}
+
+public class BasicBaseClass : IBaseInterface<BasicBaseClass>
+{
+    string className = "BasicBaseClass";
+    string IBaseInterface<BasicBaseClass>.explicitDeclaration()
+    {
+        return className;
+    }
+}
+
+public class BasicDerivedClass : BasicBaseClass, IBaseInterface<BasicDerivedClass>
+{
+    string className = "BasicDerivedClass";
+
+    string IBaseInterface<BasicDerivedClass>.explicitDeclaration()
+    {
+        return className;
+    }
+}
+
+public static class Test_Issue103365
+{
+    [Fact]
+  	public static void Main ()
+	{
+        var instances = new IBaseInterface<BasicBaseClass>[2];
+        instances[0] = new BasicBaseClass();
+        instances[1] = new BasicDerivedClass();
+        Assert.Equal("BasicBaseClass", instances[0].explicitDeclaration());
+        Assert.Equal("BasicDerivedClass", instances[1].explicitDeclaration());
+  	}
+}
+

src/tests/Regressions/coreclr/103365/103365.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <ItemGroup>
+    <Compile Include="103365.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="$(TestSourceDir)Common/CoreCLRTestLibrary/CoreCLRTestLibrary.csproj" />
+  </ItemGroup>
+</Project>