Index: trunk/test/unit/org/openstreetmap/josm/tools/AlphanumComparatorTest.groovy
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/tools/AlphanumComparatorTest.groovy	(revision 6871)
+++ trunk/test/unit/org/openstreetmap/josm/tools/AlphanumComparatorTest.groovy	(revision 6871)
@@ -0,0 +1,18 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.tools
+
+class AlphanumComparatorTest extends GroovyTestCase {
+
+    void testNumeric() {
+        def lst = Arrays.asList("1", "20", "-1", "00999", "100")
+        Collections.sort(lst, AlphanumComparator.getInstance())
+        assert lst == Arrays.asList("-1", "1", "20", "100", "00999")
+    }
+
+    void testMixed() {
+        def lst = Arrays.asList("b1", "b20", "a5", "a00999", "a100")
+        Collections.sort(lst, AlphanumComparator.getInstance())
+        assert lst == Arrays.asList("a5", "a100", "a00999", "b1", "b20")
+    }
+
+}