Adding a unit test and some comments for how to implement multiple interfaces exports.

src/main/java/org/eclipse/sisu/contrib/peaberry/ServiceExportAnnotationProcessor.java

@@ -83,9 +83,12 @@ private PeaberryData populatePeaberryData(final Element componentClazz) {
 		}
 		catch( MirroredTypesException mte ) {
 			List<? extends TypeMirror> typeMirrors = mte.getTypeMirrors();
-			Element element = ((DeclaredType)typeMirrors.get(0)).asElement();
-			peaberryData.serviceInterface = element.toString();
-			peaberryData.serviceInterfaceSimpleName = element.getSimpleName().toString();
+			// todo - Figure out what the Peaberry code to export a service under multiple interfaces looks like and update the velocity templates
+			for (TypeMirror typeMirror : typeMirrors) {
+				Element serviceInterface = ((DeclaredType)typeMirror).asElement();
+				peaberryData.serviceInterface = serviceInterface.toString();
+				peaberryData.serviceInterfaceSimpleName = serviceInterface.getSimpleName().toString();
+			}
 		}
 
 		TypeElement classElement = (TypeElement) componentClazz;

src/test/java/org/eclipse/sisu/contrib/peaberry/PeaberryAnnotationProcessorTest.java

@@ -3,6 +3,7 @@
 import static com.google.common.truth.Truth.assert_;
 import static com.google.testing.compile.JavaSourceSubjectFactory.javaSource;
 
+import org.junit.Ignore;
 import org.junit.Test;
 
 import com.google.testing.compile.JavaFileObjects;
@@ -104,4 +105,23 @@ private void testPeaberryImportClassGeneratesCorrectlyForServiceLists() {
 				);
 	}
 
+	@Test
+	@Ignore
+	public void testPeaberryExportClassGeneratesCorrectlyForMultipleServiceInterfaces() {
+		assert_().about(javaSource())
+				.that(JavaFileObjects.forResource("ServiceOneAndTwoImpl.java"))
+				.processedWith(
+						new ServiceExportAnnotationProcessor(),
+						new ServiceImportAnnotationProcessor()
+				)
+				.compilesWithoutError()
+				/* todo - Figure out what the Peaberry code to export a service under multiple interfaces looks like
+				.and()
+
+				.generatesSources(
+						JavaFileObjects.forResource("ServiceOnePeaberryExportModule.java"),
+						JavaFileObjects.forResource("ServiceOnePeaberryServiceExport.java")
+				)*/;
+	}
+
 }

src/test/java/org/eclipse/sisu/contrib/peaberry/testdata/ServiceOneAndTwoImpl.java

@@ -0,0 +1,10 @@
+package org.eclipse.sisu.contrib.peaberry.testdata;
+
+import org.eclipse.sisu.contrib.peaberry.annotations.ServiceExport;
+
+/**
+ * Example Service to be exported under multiple interfaces.
+ */
+@ServiceExport( interfaces = {ServiceOne.class, ServiceTwo.class})
+public class ServiceOneAndTwoImpl implements ServiceOne, ServiceTwo {
+}