Index: trunk/test/unit/org/openstreetmap/josm/testutils/JOSMTestRules.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/testutils/JOSMTestRules.java	(revision 11772)
+++ trunk/test/unit/org/openstreetmap/josm/testutils/JOSMTestRules.java	(revision 11777)
@@ -15,4 +15,5 @@
 import org.openstreetmap.josm.Main;
 import org.openstreetmap.josm.data.projection.Projections;
+import org.openstreetmap.josm.gui.mappaint.MapPaintStyles;
 import org.openstreetmap.josm.gui.util.GuiHelper;
 import org.openstreetmap.josm.io.OsmApi;
@@ -44,4 +45,5 @@
     private boolean commands;
     private boolean allowMemoryManagerLeaks;
+    private boolean useMapStyles;
 
     /**
@@ -153,4 +155,15 @@
     public JOSMTestRules memoryManagerLeaks() {
         allowMemoryManagerLeaks = true;
+        return this;
+    }
+
+    /**
+     * Use map styles in this test.
+     * @return this instance, for easy chaining
+     * @since 11777
+     */
+    public JOSMTestRules mapStyles() {
+        preferences();
+        useMapStyles = true;
         return this;
     }
@@ -233,4 +246,9 @@
         if (platform) {
             Main.determinePlatformHook();
+        }
+
+        if (useMapStyles) {
+            // Reset the map paint styles.
+            MapPaintStyles.readFromPreferences();
         }