3 files changed, 8 insertions, 8 deletions
diff --git a/server/src/test/java/com/vaadin/tests/design/DeclarativeTestBaseBase.java b/server/src/test/java/com/vaadin/tests/design/DeclarativeTestBaseBase.java
index 041df2deee..609ec6d620 100644
--- a/server/src/test/java/com/vaadin/tests/design/DeclarativeTestBaseBase.java
+++ b/server/src/test/java/com/vaadin/tests/design/DeclarativeTestBaseBase.java
@@ -277,15 +277,15 @@ public abstract class DeclarativeTestBaseBase<T extends Component> {
         }
         Collections.sort(names);
 
-        sb.append("<").append(producedElem.tagName()).append("");
+        sb.append('<').append(producedElem.tagName());
         for (String attrName : names) {
-            sb.append(" ").append(attrName);
+            sb.append(' ').append(attrName);
             if (!booleanAttributes.contains(attrName)) {
-                sb.append("=").append("\'").append(producedElem.attr(attrName))
+                sb.append('=').append("\'").append(producedElem.attr(attrName))
                         .append("\'");
             }
         }
-        sb.append(">");
+        sb.append('>');
         for (Node child : producedElem.childNodes()) {
             if (child instanceof Element) {
                 elementToHtml((Element) child, sb);
@@ -294,7 +294,7 @@ public abstract class DeclarativeTestBaseBase<T extends Component> {
                 sb.append(text.trim());
             }
         }
-        sb.append("</").append(producedElem.tagName()).append(">");
+        sb.append("</").append(producedElem.tagName()).append('>');
         return sb.toString();
     }
 
diff --git a/server/src/test/java/com/vaadin/tests/server/clientconnector/AttachDetachListenersTest.java b/server/src/test/java/com/vaadin/tests/server/clientconnector/AttachDetachListenersTest.java
index 65b7b437e0..79cbd59d6e 100644
--- a/server/src/test/java/com/vaadin/tests/server/clientconnector/AttachDetachListenersTest.java
+++ b/server/src/test/java/com/vaadin/tests/server/clientconnector/AttachDetachListenersTest.java
@@ -163,7 +163,7 @@ public class AttachDetachListenersTest {
             buffer.append("expected ")
                     .append(expected.getClass().getSimpleName())
                     .append(" with connector ").append(expected.getConnector());
-            buffer.append(")");
+            buffer.append(')');
         }
 
         @Override
diff --git a/server/src/test/java/com/vaadin/tests/util/GraphVizClassHierarchyCreator.java b/server/src/test/java/com/vaadin/tests/util/GraphVizClassHierarchyCreator.java
index 3f07d1c178..395d1b1584 100644
--- a/server/src/test/java/com/vaadin/tests/util/GraphVizClassHierarchyCreator.java
+++ b/server/src/test/java/com/vaadin/tests/util/GraphVizClassHierarchyCreator.java
@@ -50,14 +50,14 @@ public class GraphVizClassHierarchyCreator {
         header.append("    node [shape = ellipse, style=\"dotted\"] ");
         for (Class c : classesAndParents) {
             if (!c.isInterface() && Modifier.isAbstract(c.getModifiers())) {
-                header.append(c.getSimpleName()).append(" ");
+                header.append(c.getSimpleName()).append(' ');
             }
         }
         if (includeInterfaces) {
             System.out.print("    node [shape = ellipse, style=\"solid\"] ");
             for (Class c : classesAndParents) {
                 if (c.isInterface()) {
-                    header.append(c.getSimpleName()).append(" ");
+                    header.append(c.getSimpleName()).append(' ');
                 }
             }
             header.append(";\n");