diff --git a/lucene/core/src/test/org/apache/lucene/index/TestCompoundFile.java b/lucene/core/src/test/org/apache/lucene/index/TestCompoundFile.java
index 963e9fe26ba..6e8e65a236d 100644
--- a/lucene/core/src/test/org/apache/lucene/index/TestCompoundFile.java
+++ b/lucene/core/src/test/org/apache/lucene/index/TestCompoundFile.java
@@ -17,24 +17,23 @@ package org.apache.lucene.index;
  * limitations under the License.
  */
 
-import java.io.IOException;
-import java.io.File;
-
-import org.apache.lucene.util.IOUtils;
-import org.apache.lucene.util.LuceneTestCase;
-
 import org.apache.lucene.document.Document;
 import org.apache.lucene.document.Field;
 import org.apache.lucene.store.CompoundFileDirectory;
-import org.apache.lucene.store.IOContext;
-import org.apache.lucene.store.IndexOutput;
 import org.apache.lucene.store.Directory;
+import org.apache.lucene.store.IOContext;
 import org.apache.lucene.store.IndexInput;
+import org.apache.lucene.store.IndexOutput;
 import org.apache.lucene.store.SimpleFSDirectory;
-import org.apache.lucene.store._TestHelper;
-import org.apache.lucene.util.TestUtil;
+import org.apache.lucene.util.IOUtils;
+import org.apache.lucene.util.LuceneTestCase;
 import org.apache.lucene.util.TestUtil;
 
+import java.io.File;
+import java.io.IOException;
+
+import static org.apache.lucene.store.TestHelper.isSimpleFSIndexInput;
+import static org.apache.lucene.store.TestHelper.isSimpleFSIndexInputOpen;
 
 public class TestCompoundFile extends LuceneTestCase
 {
@@ -346,8 +345,8 @@ public class TestCompoundFile extends LuceneTestCase
         IndexInput expected = dir.openInput("f11", newIOContext(random()));
 
         // this test only works for FSIndexInput
-        assertTrue(_TestHelper.isSimpleFSIndexInput(expected));
-        assertTrue(_TestHelper.isSimpleFSIndexInputOpen(expected));
+        assertTrue(isSimpleFSIndexInput(expected));
+        assertTrue(isSimpleFSIndexInputOpen(expected));
 
         IndexInput one = cr.openInput("f11", newIOContext(random()));
 
diff --git a/lucene/test-framework/src/java/org/apache/lucene/store/_TestHelper.java b/lucene/test-framework/src/java/org/apache/lucene/store/TestHelper.java
similarity index 97%
rename from lucene/test-framework/src/java/org/apache/lucene/store/_TestHelper.java
rename to lucene/test-framework/src/java/org/apache/lucene/store/TestHelper.java
index c3789e08989..7f972332850 100644
--- a/lucene/test-framework/src/java/org/apache/lucene/store/_TestHelper.java
+++ b/lucene/test-framework/src/java/org/apache/lucene/store/TestHelper.java
@@ -24,7 +24,10 @@ import org.apache.lucene.store.SimpleFSDirectory.SimpleFSIndexInput;
 /** This class provides access to package-level features defined in the
  *  store package. It is used for testing only.
  */
-public class _TestHelper {
+public final class TestHelper {
+  private TestHelper() {
+    //
+  }
 
     /** Returns true if the instance of the provided input stream is actually
      *  an SimpleFSIndexInput.