Fix tests.

wise-webapp/src/main/java/com/wisemapping/model/MindMap.java

@@ -29,6 +29,7 @@ package com.wisemapping.model;
 
 import com.wisemapping.util.ZipUtils;
 import org.apache.log4j.Logger;
+import org.jetbrains.annotations.NotNull;
 
 import java.io.IOException;
 import java.util.Calendar;
@@ -189,7 +190,7 @@ public class MindMap {
         return xml;
     }
 
-    public void setNativeXml(String nativeXml)
+    public void setNativeXml(@NotNull String nativeXml)
             throws IOException {
         this.xml = ZipUtils.stringToZip(nativeXml);
     }

wise-webapp/src/main/java/com/wisemapping/model/MindmapIcon.java

@@ -18,7 +18,7 @@
 
 package com.wisemapping.model;
 
-public class MindmapIcon {
+public class MindmapIcon implements Comparable{
     private String name;
     private IconFamily family;
 
@@ -38,4 +38,8 @@ public class MindmapIcon {
     public String getId() {
         return family.name().toLowerCase() + "_" + name;
     }
+
+    public int compareTo(Object o) {
+        return ((MindmapIcon)o).getId().compareTo(this.getId());
+    }
 }

wise-webapp/src/main/java/com/wisemapping/model/MindmapIcons.java

@@ -203,7 +203,7 @@ public class MindmapIcons {
     private static void load() {
         try {
             if (iconsByFamily == null) {
-                iconsByFamily = new HashMap<IconFamily, List<MindmapIcon>>();
+                iconsByFamily = new TreeMap<IconFamily, List<MindmapIcon>>();
 
                 Field[] fields = MindmapIcons.class.getDeclaredFields();
                 for (Field field : fields) {