Add a test to track #461

src/IKVM.Tests/Runtime/DefaultInterfaceMethodTests.cs

@@ -0,0 +1,68 @@
+using FluentAssertions;
+
+using IKVM.Tests.Util;
+
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace IKVM.Tests.Runtime
+{
+
+    [TestClass]
+    public class DefaultInterfaceMethodTests
+    {
+
+        [TestMethod]
+        [Ignore]
+        public void ShouldResolveOverlappingDefaultImplementation()
+        {
+            var code = @"
+
+public class TestClass {
+
+    public static interface CommandInteractionPayload {
+
+        int getValue();
+
+    }
+
+    public static interface CommandInteraction extends CommandInteractionPayload {
+
+    }
+
+    public static interface CommandInteractionPayloadMixin extends CommandInteractionPayload {
+
+        @Override
+        default int getValue() {
+            return 1;
+        }
+
+    }
+
+    public static class CommandInteractionImpl implements CommandInteraction, CommandInteractionPayloadMixin {
+        
+    }
+
+    public static interface SlashCommandInteraction extends CommandInteraction {
+
+    }
+
+    public static class SlashCommandInteractionImpl extends CommandInteractionImpl implements SlashCommandInteraction {
+        
+    }
+
+}
+
+";
+            var unit = new InMemoryCodeUnit("TestClass", code);
+            var compiler = new InMemoryCompiler(new[] { unit });
+            compiler.Compile();
+
+            var clazz = compiler.GetClass("TestClass$SlashCommandInteractionImpl");
+            var ctor = clazz.getConstructor();
+            dynamic test = ctor.newInstance(System.Array.Empty<object>());
+            ((int)test.getValue()).Should().Be(1);
+        }
+
+    }
+
+}