Index: trunk/test/unit/org/openstreetmap/josm/testutils/annotations/Territories.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/testutils/annotations/Territories.java	(revision 18798)
+++ trunk/test/unit/org/openstreetmap/josm/testutils/annotations/Territories.java	(revision 18798)
@@ -0,0 +1,90 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.testutils.annotations;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+import java.util.Optional;
+
+import org.junit.jupiter.api.extension.BeforeAllCallback;
+import org.junit.jupiter.api.extension.BeforeEachCallback;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.platform.commons.support.AnnotationSupport;
+import org.openstreetmap.josm.testutils.JOSMTestRules;
+
+/**
+ * Use boundaries dataset in this test.
+ *
+ * @see JOSMTestRules#territories()
+ * @author Taylor Smock
+ * @since 18798
+ */
+@Documented
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.TYPE, ElementType.METHOD})
+@BasicPreferences // Needed for nodes
+@Projection // Needed for getEastNorth
+@ExtendWith(Territories.TerritoriesExtension.class)
+public @interface Territories {
+    /**
+     * Initialization states. Please note that the highest initialization state
+     * holds. At some point in time, we <i>may</i> clean up the {@link org.openstreetmap.josm.tools.Territories}
+     * class so that tests are fully isolated.
+     *
+     * @author Taylor Smock
+     */
+    enum Initialize {
+        /** Don't initialize */
+        NONE,
+        /** Initialize only internal data */
+        INTERNAL,
+        /** Initialize internal and external data */
+        ALL
+    }
+
+    /**
+     * The way to initialize Territories
+     *
+     * @return The value to use
+     */
+    Initialize value() default Initialize.INTERNAL;
+
+    /**
+     * Initialize boundaries prior to use
+     *
+     * @author Taylor Smock
+     *
+     */
+    class TerritoriesExtension implements BeforeAllCallback, BeforeEachCallback {
+        private static Initialize last = Initialize.NONE;
+
+        @Override
+        public void beforeAll(ExtensionContext context) throws Exception {
+            this.beforeEach(context);
+        }
+
+        @Override
+        public void beforeEach(ExtensionContext context) throws Exception {
+            Optional<Territories> annotation = AnnotationSupport.findAnnotation(context.getElement(),
+                    Territories.class);
+            if (annotation.isPresent()) {
+                Initialize current = annotation.get().value();
+                if (current.ordinal() <= last.ordinal()) {
+                    return;
+                }
+                last = current;
+                // Avoid potential race conditions if tests are parallelized
+                synchronized (TerritoriesExtension.class) {
+                    if (current == Initialize.INTERNAL) {
+                        org.openstreetmap.josm.tools.Territories.initializeInternalData();
+                    } else if (current == Initialize.ALL) {
+                        org.openstreetmap.josm.tools.Territories.initialize();
+                    }
+                }
+            }
+        }
+    }
+}