diff --git a/zktest/src/test/java/org/zkoss/zktest/zats/test2/B50_2946333Test.java b/zktest/src/test/java/org/zkoss/zktest/zats/test2/B50_2946333Test.java
index 6ed88bafe1..0b1b6e4bf1 100644
--- a/zktest/src/test/java/org/zkoss/zktest/zats/test2/B50_2946333Test.java
+++ b/zktest/src/test/java/org/zkoss/zktest/zats/test2/B50_2946333Test.java
@@ -1,9 +1,9 @@
 /* B50_2946333Test.java
 
 	Purpose:
-		
+
 	Description:
-		
+
 	History:
 		Wed Mar 20 17:43:09 CST 2019, Created by rudyhuang
 
@@ -27,7 +27,7 @@ public class B50_2946333Test extends WebDriverTestCase {
 	@Test
 	public void test() {
 		connect();
-
+		waitResponse();
 		int splitterTop50per = jq(".z-north-splitter").positionTop();
 
 		click(jq("@button:contains(25%)"));
diff --git a/zktest/src/test/java/org/zkoss/zktest/zats/test2/B50_3052381Test.java b/zktest/src/test/java/org/zkoss/zktest/zats/test2/B50_3052381Test.java
index 619f5d9fcb..2e21579659 100644
--- a/zktest/src/test/java/org/zkoss/zktest/zats/test2/B50_3052381Test.java
+++ b/zktest/src/test/java/org/zkoss/zktest/zats/test2/B50_3052381Test.java
@@ -1,9 +1,9 @@
 /* B50_3052381Test.java
 
 	Purpose:
-		
+
 	Description:
-		
+
 	History:
 		Tue Mar 26 16:03:07 CST 2019, Created by rudyhuang
 
@@ -16,6 +16,7 @@
 
 import java.util.Collections;
 
+import net.jcip.annotations.NotThreadSafe;
 import org.junit.jupiter.api.Test;
 import org.openqa.selenium.chrome.ChromeOptions;
 
@@ -25,6 +26,7 @@
 /**
  * @author rudyhuang
  */
+@NotThreadSafe
 public class B50_3052381Test extends DockerWebDriverTestCase {
 	@Override
 	protected ChromeOptions getWebDriverOptions() {