diff --git a/README.md b/README.md
index b4a7e5c7cd..b442624024 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,7 @@ Dolphin Scheduler
 ============
 [![License](https://img.shields.io/badge/license-Apache%202-4EB1BA.svg)](https://www.apache.org/licenses/LICENSE-2.0.html)
 [![Total Lines](https://tokei.rs/b1/github/apache/Incubator-DolphinScheduler?category=lines)](https://github.com/apache/Incubator-DolphinScheduler)
+[![codecov](https://codecov.io/gh/apache/incubator-dolphinscheduler/branch/dev/graph/badge.svg)](https://codecov.io/gh/apache/incubator-dolphinscheduler)
 
 > Dolphin Scheduler for Big Data
 
diff --git a/README_zh_CN.md b/README_zh_CN.md
index 6bdf7be183..07b40fb095 100644
--- a/README_zh_CN.md
+++ b/README_zh_CN.md
@@ -2,6 +2,7 @@ Dolphin Scheduler
 ============
 [![License](https://img.shields.io/badge/license-Apache%202-4EB1BA.svg)](https://www.apache.org/licenses/LICENSE-2.0.html)
 [![Total Lines](https://tokei.rs/b1/github/apache/Incubator-DolphinScheduler?category=lines)](https://github.com/apache/Incubator-DolphinScheduler)
+[![codecov](https://codecov.io/gh/apache/incubator-dolphinscheduler/branch/dev/graph/badge.svg)](https://codecov.io/gh/apache/incubator-dolphinscheduler)
 
 > Dolphin Scheduler for Big Data
 
diff --git a/dolphinscheduler-common/src/test/java/org/apache/dolphinscheduler/common/utils/CollectionUtilsTest.java b/dolphinscheduler-common/src/test/java/org/apache/dolphinscheduler/common/utils/CollectionUtilsTest.java
index 573e62bf5e..30c11522b6 100644
--- a/dolphinscheduler-common/src/test/java/org/apache/dolphinscheduler/common/utils/CollectionUtilsTest.java
+++ b/dolphinscheduler-common/src/test/java/org/apache/dolphinscheduler/common/utils/CollectionUtilsTest.java
@@ -19,10 +19,7 @@ package org.apache.dolphinscheduler.common.utils;
 import org.junit.Assert;
 import org.junit.Test;
 
-import java.util.ArrayList;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Set;
+import java.util.*;
 
 
 public class CollectionUtilsTest {
@@ -56,4 +53,10 @@ public class CollectionUtilsTest {
         b.add(4);
         Assert.assertArrayEquals(new Integer[]{1,3},CollectionUtils.subtract(a,b).toArray());
     }
+
+    @Test
+    public void stringToMap() {
+        Map<String, String> a = CollectionUtils.stringToMap("a=b;c=d", ";", "");
+        Assert.assertNotNull(a);
+    }
 }