diff --git a/common/src/test/java/org/apache/rocketmq/common/MixAllTest.java b/common/src/test/java/org/apache/rocketmq/common/MixAllTest.java
index b0f36488d99951de646745685a0d3a3e8ece051c..3a40dd56a7e3a584da13ae66f984f6a764726e6e 100644
--- a/common/src/test/java/org/apache/rocketmq/common/MixAllTest.java
+++ b/common/src/test/java/org/apache/rocketmq/common/MixAllTest.java
@@ -17,14 +17,17 @@
 
 package org.apache.rocketmq.common;
 
+import java.io.File;
+import java.io.IOException;
+import java.io.PrintWriter;
 import java.net.InetAddress;
 import java.util.List;
+import java.util.concurrent.atomic.AtomicLong;
 import org.junit.Test;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
 public class MixAllTest {
-
     @Test
     public void testGetLocalInetAddress() throws Exception {
         List<String> localInetAddress = MixAll.getLocalInetAddress();
@@ -32,4 +35,42 @@ public class MixAllTest {
         assertThat(localInetAddress).contains("127.0.0.1");
         assertThat(localInetAddress).contains(local);
     }
+
+    @Test
+    public void testBrokerVIPChannel() {
+        assertThat(MixAll.brokerVIPChannel(true, "127.0.0.1:10911")).isEqualTo("127.0.0.1:10909");
+    }
+
+    @Test
+    public void testCompareAndIncreaseOnly() {
+        AtomicLong target = new AtomicLong(5);
+        assertThat(MixAll.compareAndIncreaseOnly(target, 6)).isTrue();
+        assertThat(target.get()).isEqualTo(6);
+
+        assertThat(MixAll.compareAndIncreaseOnly(target, 4)).isFalse();
+        assertThat(target.get()).isEqualTo(6);
+    }
+
+    @Test
+    public void testFile2String() throws IOException {
+        String fileName = System.getProperty("java.io.tmpdir") + File.separator + "MixAllTest" + System.currentTimeMillis();
+        File file = new File(fileName);
+        if (file.exists()) {
+            file.delete();
+        }
+        file.createNewFile();
+        try(  PrintWriter out = new PrintWriter( fileName )  ){
+            out.write("TestForMixAll");
+        }
+        String string = MixAll.file2String(fileName);
+        assertThat(string).isEqualTo("TestForMixAll");
+        file.delete();
+    }
+
+    @Test
+    public void testString2File() throws IOException {
+        String fileName = System.getProperty("java.io.tmpdir") + File.separator + "MixAllTest" + System.currentTimeMillis();
+        MixAll.string2File("MixAll_testString2File", fileName);
+        assertThat(MixAll.file2String(fileName)).isEqualTo("MixAll_testString2File");
+    }
 }