Index: applications/viewer/jmapviewer/test/org/openstreetmap/gui/jmapviewer/tilesources/TemplatedTMSTileSourceTest.java
===================================================================
--- applications/viewer/jmapviewer/test/org/openstreetmap/gui/jmapviewer/tilesources/TemplatedTMSTileSourceTest.java	(revision 34715)
+++ applications/viewer/jmapviewer/test/org/openstreetmap/gui/jmapviewer/tilesources/TemplatedTMSTileSourceTest.java	(revision 34715)
@@ -0,0 +1,198 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.gui.jmapviewer.tilesources;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import java.text.MessageFormat;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.function.Predicate;
+import java.util.stream.Stream;
+
+import org.apache.commons.lang3.tuple.Triple;
+import org.junit.Test;
+import org.openstreetmap.josm.data.imagery.ImageryInfo;
+
+
+/**
+ *
+ * Tests for TemplaedTMSTileSource
+ */
+public class TemplatedTMSTileSourceTest {
+
+    private final static Collection<String> TMS_IMAGERIES = Arrays.asList(new String[]{
+            "http://imagico.de/map/osmim_tiles.php?layer=S2A_R136_N41_20150831T093006&z={zoom}&x={x}&y={-y}",
+            /*
+             *  generate for example with:
+             *  $ curl https://josm.openstreetmap.de/maps | \
+             *    xmlstarlet sel -N 'josm=http://josm.openstreetmap.de/maps-1.0' -t -v "//josm:entry[josm:type='tms']/josm:url" -n  | \
+             *    sed -e 's/\&amp;/\&/g' -e 's/^/"/' -e 's/$/",/'
+             */
+    });
+
+    /**
+     * triple of:
+     *  * baseUrl
+     *  * expected tile url for zoom=1, x=2, y=3
+     *  * expected tile url for zoom=3, x=2, y=1
+     */
+    @SuppressWarnings("unchecked")
+    private Collection<Triple<String, String, String>> TEST_DATA = Arrays.asList(new Triple[] {
+            Triple.of("http://imagico.de/map/osmim_tiles.php?layer=S2A_R136_N41_20150831T093006&z={zoom}&x={x}&y={-y}", "http://imagico.de/map/osmim_tiles.php?layer=S2A_R136_N41_20150831T093006&z=1&x=2&y=-2", "http://imagico.de/map/osmim_tiles.php?layer=S2A_R136_N41_20150831T093006&z=3&x=2&y=6"),
+            /*
+             * generate with main method below once TMS_IMAGERIES is filled in
+             */
+    });
+
+    /**
+     * Check standard template
+     */
+    @Test
+    public void testGetTileUrl() {
+        checkGetTileUrl(
+                "http://localhost/{z}/{x}/{y}",
+                "http://localhost/1/2/3",
+                "http://localhost/3/1/2"
+                );
+    }
+
+
+    /**
+     * Check template with positive zoom index
+     */
+    @Test
+    public void testGetTileUrl_positive_zoom() {
+        checkGetTileUrl(
+                "http://localhost/{zoom+5}/{x}/{y}",
+                "http://localhost/6/2/3",
+                "http://localhost/8/1/2"
+                );
+    }
+
+    /**
+     * Check template with negative zoom index
+     */
+    @Test
+    public void testGetTileUrl_negative_zoom() {
+        checkGetTileUrl(
+                "http://localhost/{zoom-5}/{x}/{y}",
+                "http://localhost/-4/2/3",
+                "http://localhost/-2/1/2"
+                );
+    }
+
+    /**
+     * Check template with inverse zoom index
+     */
+    @Test
+    public void testGetTileUrl_inverse_negative_zoom() {
+        checkGetTileUrl(
+                "http://localhost/{5-zoom}/{x}/{y}",
+                "http://localhost/4/2/3",
+                "http://localhost/2/1/2"
+                );
+    }
+
+    /**
+     * Check template with inverse zoom index and negative zoom index
+     */
+    @Test
+    public void testGetTileUrl_both_offsets() {
+        checkGetTileUrl(
+                "http://localhost/{10-zoom-5}/{x}/{y}",
+                "http://localhost/4/2/3",
+                "http://localhost/2/1/2"
+                );
+    }
+
+    /**
+     * Test template with switch
+     */
+    @Test
+    public void testGetTileUrl_switch() {
+        ImageryInfo testImageryTMS = new ImageryInfo("test imagery", "http://{switch:a,b,c}.localhost/{10-zoom-5}/{x}/{y}", "tms", null, null);
+        TemplatedTMSTileSource ts = new TemplatedTMSTileSource(testImageryTMS);
+        assertTrue(
+                Stream.of(
+                        "http://a.localhost/4/2/3",
+                        "http://b.localhost/4/2/3",
+                        "http://c.localhost/4/2/3"
+                        )
+                .anyMatch(Predicate.isEqual(ts.getTileUrl(1, 2, 3)))
+                );
+
+        assertTrue(
+                Stream.of(
+                        "http://a.localhost/3/3/4",
+                        "http://b.localhost/3/3/4",
+                        "http://c.localhost/3/3/4"
+                        )
+                .anyMatch(Predicate.isEqual(ts.getTileUrl(2, 3, 4)))
+                );
+        assertTrue(
+                Stream.of(
+                        "http://a.localhost/2/4/5",
+                        "http://b.localhost/2/4/5",
+                        "http://c.localhost/2/4/5"
+                        )
+                .anyMatch(Predicate.isEqual(ts.getTileUrl(3, 4, 5)))
+                );
+        assertTrue(
+                Stream.of(
+                        "http://a.localhost/1/5/6",
+                        "http://b.localhost/1/5/6",
+                        "http://c.localhost/1/5/6"
+                        )
+                .anyMatch(Predicate.isEqual(ts.getTileUrl(4, 5, 6)))
+                );
+    }
+
+    @Test
+    public void testGetTileUrl_yahoo() {
+        checkGetTileUrl(
+                "http://localhost/{z}/{x}/{!y}",
+                "http://localhost/1/2/-3",
+                "http://localhost/3/1/1"
+                );
+
+    }
+
+    @Test
+    public void testGetTileUrl_negative_y() {
+        checkGetTileUrl(
+                "http://localhost/{z}/{x}/{-y}",
+                "http://localhost/1/2/-2",
+                "http://localhost/3/1/5"
+                );
+
+    }
+
+    private void checkGetTileUrl(String url, String expected123, String expected312) {
+        ImageryInfo testImageryTMS = new ImageryInfo("test imagery", url, "tms", null, null);
+        TemplatedTMSTileSource ts = new TemplatedTMSTileSource(testImageryTMS);
+        assertEquals(expected123, ts.getTileUrl(1, 2, 3));
+        assertEquals(expected312, ts.getTileUrl(3, 1, 2));
+    }
+    /**
+     * Tests all entries in TEST_DATA. This test will fail if {switch:...} template is used
+     */
+    @Test
+    public void testAllUrls() {
+        for(Triple<String, String, String> test: TEST_DATA) {
+            ImageryInfo testImageryTMS = new ImageryInfo("test imagery", test.getLeft(), "tms", null, null);
+            TemplatedTMSTileSource ts = new TemplatedTMSTileSource(testImageryTMS);
+            assertEquals(test.getMiddle(), ts.getTileUrl(1, 2, 3));
+            assertEquals(test.getRight(), ts.getTileUrl(3, 2, 1));
+        }
+    }
+
+    public static void main(String[] args) {
+        for(String url: TMS_IMAGERIES) {
+            ImageryInfo testImageryTMS = new ImageryInfo("test imagery", url, "tms", null, null);
+            TemplatedTMSTileSource ts = new TemplatedTMSTileSource(testImageryTMS);
+            System.out.println(MessageFormat.format("Triple.of(\"{0}\", \"{1}\", \"{2}\"),", url, ts.getTileUrl(1, 2, 3), ts.getTileUrl(3, 2, 1)));
+        }
+    }
+
+}