Index: lucene/src/test/org/apache/lucene/collation/CollationTestBase.java
===================================================================
--- lucene/src/test/org/apache/lucene/collation/CollationTestBase.java	(revision 934796)
+++ lucene/src/test/org/apache/lucene/collation/CollationTestBase.java	(working copy)
@@ -42,7 +42,7 @@
 
 import java.io.IOException;
 
-public class CollationTestBase extends LuceneTestCase {
+public abstract class CollationTestBase extends LuceneTestCase {
 
   protected String firstRangeBeginningOriginal = "\u062F";
   protected String firstRangeEndOriginal = "\u0698";
Index: lucene/src/test/org/apache/lucene/util/cache/BaseTestLRU.java
===================================================================
--- lucene/src/test/org/apache/lucene/util/cache/BaseTestLRU.java	(revision 934796)
+++ lucene/src/test/org/apache/lucene/util/cache/BaseTestLRU.java	(working copy)
@@ -19,7 +19,7 @@
 
 import org.apache.lucene.util.LuceneTestCase;
 
-public class BaseTestLRU extends LuceneTestCase {
+public abstract class BaseTestLRU extends LuceneTestCase {
 
   protected void testCache(Cache<Integer,Object> cache, int n) throws Exception {
     Object dummy = new Object();
Index: lucene/contrib/benchmark/src/test/org/apache/lucene/benchmark/BenchmarkTestCase.java
===================================================================
--- lucene/contrib/benchmark/src/test/org/apache/lucene/benchmark/BenchmarkTestCase.java	(revision 934796)
+++ lucene/contrib/benchmark/src/test/org/apache/lucene/benchmark/BenchmarkTestCase.java	(working copy)
@@ -22,7 +22,7 @@
 import org.apache.lucene.util.LuceneTestCase;
 
 /** Base class for all Benchmark unit tests. */
-public class BenchmarkTestCase extends LuceneTestCase {
+public abstract class BenchmarkTestCase extends LuceneTestCase {
 
   private static final File workDir;