fix compilation failure due to trunk change

git-svn-id: https://svn.apache.org/repos/asf/maven/plugin-testing/branches/plugin-testing-mvn-3.x@815947 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/maven-plugin-testing-harness/src/main/java/org/apache/maven/plugin/testing/stubs/ArtifactStub.java b/maven-plugin-testing-harness/src/main/java/org/apache/maven/plugin/testing/stubs/ArtifactStub.java
index fa890f5..4f4e669 100644
--- a/maven-plugin-testing-harness/src/main/java/org/apache/maven/plugin/testing/stubs/ArtifactStub.java
+++ b/maven-plugin-testing-harness/src/main/java/org/apache/maven/plugin/testing/stubs/ArtifactStub.java
@@ -62,7 +62,7 @@
      *
      * @see java.lang.Comparable#compareTo(java.lang.Object)
      */
-    public int compareTo( Object object )
+    public int compareTo( Artifact artifact )
     {
         return 0;
     }