diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/TestCompressorDecompressor.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/TestCompressorDecompressor.java
index 1f035974883cf..5df0e347a69f8 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/TestCompressorDecompressor.java
+++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/TestCompressorDecompressor.java
@@ -50,7 +50,7 @@ public class TestCompressorDecompressor {
   
   @Test
   public void testCompressorDecompressor() {
-    // no more for this data
+    // no more for this data, test
     int SIZE = 44 * 1024;
     
     byte[] rawData = generate(SIZE);
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/snappy/TestSnappyCompressorDecompressor.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/snappy/TestSnappyCompressorDecompressor.java
index cc986c7e0aea4..d5b7c25e8130d 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/snappy/TestSnappyCompressorDecompressor.java
+++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/snappy/TestSnappyCompressorDecompressor.java
@@ -168,6 +168,7 @@ public void testSnappyDecompressorCompressAIOBException() {
 
   @Test
   public void testSnappyCompressDecompress() {
+    // test
     int BYTE_SIZE = 1024 * 54;
     byte[] bytes = BytesGenerator.get(BYTE_SIZE);
     SnappyCompressor compressor = new SnappyCompressor();
@@ -395,6 +396,7 @@ public static byte[] get(int size) {
 
   @Test
   public void testSnappyCompressDecompressInMultiThreads() throws Exception {
+    // test
     MultithreadedTestUtil.TestContext ctx = new MultithreadedTestUtil.TestContext();
     for(int i=0;i<10;i++) {
       ctx.addThread( new MultithreadedTestUtil.TestingThread(ctx) {
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/zlib/TestZlibCompressorDecompressor.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/zlib/TestZlibCompressorDecompressor.java
index 7e2ab241e195d..dd7339d2e6d2d 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/zlib/TestZlibCompressorDecompressor.java
+++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/zlib/TestZlibCompressorDecompressor.java
@@ -73,6 +73,7 @@ public void testZlibCompressorDecompressor() {
   
   @Test
   public void testCompressorDecompressorWithExeedBufferLimit() {
+    // test
     int BYTE_SIZE = 100 * 1024;
     byte[] rawData = generate(BYTE_SIZE);
     try {
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestDiskChecker.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestDiskChecker.java
index e92c9edb4fd01..507bc9dd7d7bb 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestDiskChecker.java
+++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestDiskChecker.java
@@ -39,6 +39,7 @@
 import org.slf4j.LoggerFactory;
 
 public class TestDiskChecker {
+  // test
   public static final Logger LOG =
       LoggerFactory.getLogger(TestDiskChecker.class);
 
diff --git a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestReadWriteDiskValidator.java b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestReadWriteDiskValidator.java
index b50a73f85a0e3..7f2a9bdf749bb 100644
--- a/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestReadWriteDiskValidator.java
+++ b/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestReadWriteDiskValidator.java
@@ -42,6 +42,7 @@
  */
 public class TestReadWriteDiskValidator {
 
+  // test
   private MetricsSystem ms;
 
   @Before
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/test/java/org/apache/hadoop/yarn/applications/distributedshell/TestDistributedShell.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/test/java/org/apache/hadoop/yarn/applications/distributedshell/TestDistributedShell.java
index 942d1c94c33c3..2b9a4629cb59a 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/test/java/org/apache/hadoop/yarn/applications/distributedshell/TestDistributedShell.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/test/java/org/apache/hadoop/yarn/applications/distributedshell/TestDistributedShell.java
@@ -1414,6 +1414,7 @@ public void testDistributedShellResourceProfiles() throws Exception {
 
   @Test
   public void testDSShellWithOpportunisticContainers() throws Exception {
+    // test
     Client client = new Client(new Configuration(yarnCluster.getConfig()));
     try {
       String[] args = {
@@ -1444,6 +1445,7 @@ public void testDSShellWithOpportunisticContainers() throws Exception {
   @Test
   @TimelineVersion(2.0f)
   public void testDSShellWithEnforceExecutionType() throws Exception {
+    // test
     Client client = new Client(new Configuration(yarnCluster.getConfig()));
     try {
       String[] args = {
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-csi/src/test/java/org/apache/hadoop/yarn/csi/client/TestCsiClient.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-csi/src/test/java/org/apache/hadoop/yarn/csi/client/TestCsiClient.java
index 7eed98f55172f..ab89645ab036b 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-csi/src/test/java/org/apache/hadoop/yarn/csi/client/TestCsiClient.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-csi/src/test/java/org/apache/hadoop/yarn/csi/client/TestCsiClient.java
@@ -65,6 +65,7 @@ public void beforeMethod() {
 
   @Test
   public void testIdentityService() throws IOException {
+    // test
     try {
       driver.start();
       CsiClient client = new CsiClientImpl(domainSocket);