fixed cocurrent test execution
diff --git a/impl/src/test/java/org/apache/myfaces/renderkit/html/HtmlResponseStateManagerTest.java b/impl/src/test/java/org/apache/myfaces/renderkit/html/HtmlResponseStateManagerTest.java
index 0cfd52c..2f7a984 100644
--- a/impl/src/test/java/org/apache/myfaces/renderkit/html/HtmlResponseStateManagerTest.java
+++ b/impl/src/test/java/org/apache/myfaces/renderkit/html/HtmlResponseStateManagerTest.java
@@ -20,9 +20,9 @@
 

 import java.util.HashMap;

 import java.util.Map;

+import java.util.concurrent.ConcurrentHashMap;

 import javax.faces.render.ResponseStateManager;

 import static junit.framework.TestCase.assertEquals;

-import org.apache.myfaces.renderkit.html.HtmlResponseStateManager;

 import org.apache.myfaces.test.FacesTestCase;

 import org.junit.Test;

 import org.mockito.Mockito;

@@ -33,7 +33,7 @@
     public void testIsPostback()

     {

         Mockito.when(_facesContext.getExternalContext()).thenReturn(_externalContext);

-        Mockito.when(_externalContext.getApplicationMap()).thenReturn(new HashMap<>());

+        Mockito.when(_externalContext.getApplicationMap()).thenReturn(new ConcurrentHashMap<>());

         

         HtmlResponseStateManager hrsm = Mockito.spy(HtmlResponseStateManager.class);

 

@@ -48,7 +48,7 @@
     public void testIsNoPostback()

     {

         Mockito.when(_facesContext.getExternalContext()).thenReturn(_externalContext);

-        Mockito.when(_externalContext.getApplicationMap()).thenReturn(new HashMap<>());

+        Mockito.when(_externalContext.getApplicationMap()).thenReturn(new ConcurrentHashMap<>());

         Mockito.when(_externalContext.getRequestParameterMap()).thenReturn(new HashMap<>());

         

         HtmlResponseStateManager hrsm = Mockito.spy(HtmlResponseStateManager.class);