Index: trunk/test/unit/org/openstreetmap/josm/data/osm/search/SearchCompilerTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/data/osm/search/SearchCompilerTest.java	(revision 16262)
+++ trunk/test/unit/org/openstreetmap/josm/data/osm/search/SearchCompilerTest.java	(revision 16268)
@@ -540,4 +540,18 @@
 
     /**
+     * Test whether a key exists.
+     * @throws SearchParseError never
+     */
+    @Test
+    public void testKeyExists15943() throws SearchParseError {
+        Match matcher = SearchCompiler.compile("surface:");
+        assertTrue(matcher.match(new Tag("surface", "")));
+        assertTrue(matcher.match(new Tag("surface", "wood")));
+        assertFalse(matcher.match(new Tag("surface:source", "xxx")));
+        assertFalse(matcher.match(new Tag("foo", "bar")));
+        assertFalse(matcher.match(new Tag("name", "foo:surface:bar")));
+    }
+
+    /**
      * Unit test of {@link SearchCompiler.ExactKeyValue.Mode} enum.
      */