Update only unique references during rename refactoring.

editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/search/SearchMatchTest.java

Index: editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/search/SearchMatchTest.java
diff --git a/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/search/SearchMatchTest.java b/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/search/SearchMatchTest.java
index f9932601b741496f5163cedff7c2989f94df4c3b..46e3884af7d9efa052961edbac1c7865eaf0c87b 100644
--- a/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/search/SearchMatchTest.java
+++ b/editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/search/SearchMatchTest.java
@@ -72,6 +72,17 @@ public class SearchMatchTest extends EngineTestCase {
     }
   }
 
+  public void test_hashCode() throws Exception {
+    Element element = mock(Element.class);
+    SearchMatch match = new SearchMatch(
+        MatchQuality.EXACT,
+        MatchKind.TYPE_REFERENCE,
+        element,
+        new SourceRange(10, 5));
+    // no check
+    match.hashCode();
+  }
+
   public void test_new() throws Exception {
     SearchMatch match = new SearchMatch(
         MatchQuality.EXACT,