diff --git a/src/test/java/test/com/qiniu/storage/ApiUploadV1Test.java b/src/test/java/test/com/qiniu/storage/ApiUploadV1Test.java
index a741c92d..53a767bc 100644
--- a/src/test/java/test/com/qiniu/storage/ApiUploadV1Test.java
+++ b/src/test/java/test/com/qiniu/storage/ApiUploadV1Test.java
@@ -89,7 +89,7 @@ public void testUpload(boolean isUploadBytes) {
             try {
                 Field hostsFiled = Region.class.getDeclaredField("srcUpHosts");
                 hostsFiled.setAccessible(true);
-                hosts = new ArrayList<String>((List<String>)hostsFiled.get(region));
+                hosts = new ArrayList<>((List<String>)hostsFiled.get(region));
             } catch (Exception e) {
                 e.printStackTrace();
                 fail(e);
diff --git a/src/test/java/test/com/qiniu/storage/ApiUploadV2Test.java b/src/test/java/test/com/qiniu/storage/ApiUploadV2Test.java
index 782a38ae..338f3860 100644
--- a/src/test/java/test/com/qiniu/storage/ApiUploadV2Test.java
+++ b/src/test/java/test/com/qiniu/storage/ApiUploadV2Test.java
@@ -94,7 +94,7 @@ private void testUpload(boolean isUploadBytes, boolean isSetContentLength) {
             try {
                 Field hostsFiled = Region.class.getDeclaredField("srcUpHosts");
                 hostsFiled.setAccessible(true);
-                hosts = new ArrayList<String>((List<String>)hostsFiled.get(region));
+                hosts = new ArrayList<>((List<String>)hostsFiled.get(region));
             } catch (Exception e) {
                 e.printStackTrace();
                 fail(e);
diff --git a/src/test/java/test/com/qiniu/storage/BucketTest.java b/src/test/java/test/com/qiniu/storage/BucketTest.java
index 6e4db5da..378c8a3c 100644
--- a/src/test/java/test/com/qiniu/storage/BucketTest.java
+++ b/src/test/java/test/com/qiniu/storage/BucketTest.java
@@ -8,7 +8,6 @@
 import com.qiniu.storage.Configuration;
 import com.qiniu.storage.model.*;
 import com.qiniu.util.Json;
-import com.qiniu.util.StringMap;
 import com.qiniu.util.StringUtils;
 import okhttp3.Call;
 import okhttp3.OkHttpClient;