diff --git a/vtm-tests/test/org/oscim/layers/MapEventLayerTest.java b/vtm-tests/test/org/oscim/layers/MapEventLayerTest.java
new file mode 100644
index 00000000..17efb3f8
--- /dev/null
+++ b/vtm-tests/test/org/oscim/layers/MapEventLayerTest.java
@@ -0,0 +1,106 @@
+package org.oscim.layers;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.ArgumentCaptor;
+import org.mockito.Mockito;
+import org.oscim.event.Gesture;
+import org.oscim.event.MotionEvent;
+import org.oscim.map.Animator;
+import org.oscim.map.Map;
+import org.oscim.map.ViewController;
+
+import static org.fest.assertions.api.Assertions.assertThat;
+import static org.mockito.Matchers.any;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+public class MapEventLayerTest {
+	private MapEventLayer layer;
+	private Map mockMap;
+	private ViewController mockViewport;
+	private Animator mockAnimator;
+	private ArgumentCaptor<Float> argumentCaptor;
+
+	@Before
+	public void setUp() throws Exception {
+		mockMap = Mockito.mock(Map.class);
+		mockViewport = Mockito.mock(ViewController.class);
+		mockAnimator = Mockito.mock(Animator.class);
+		layer = new MapEventLayer(mockMap);
+		when(mockMap.viewport()).thenReturn(mockViewport);
+		when(mockMap.animator()).thenReturn(mockAnimator);
+		when(mockMap.getHeight()).thenReturn(6);
+		argumentCaptor = ArgumentCaptor.forClass(float.class);
+	}
+
+	@Test
+	public void shouldNotBeNull() throws Exception {
+		assertThat(layer).isNotNull();
+	}
+
+	@Test
+	public void doubleTouchDragUp_shouldDecreaseContentScale() throws Exception {
+		layer.onTouchEvent(new TestMotionEvent(MotionEvent.ACTION_DOWN, 1, 1));
+		layer.onGesture(Gesture.DOUBLE_TAP, new TestMotionEvent(MotionEvent.ACTION_MOVE, 1, 0));
+		layer.onTouchEvent(new TestMotionEvent(MotionEvent.ACTION_MOVE, 1, 0));
+		verify(mockViewport).scaleMap(argumentCaptor.capture(), any(float.class), any(float.class));
+		assertThat(argumentCaptor.getValue()).isLessThan(1);
+	}
+
+	@Test
+	public void doubleTouchDragDown_shouldIncreaseContentScale() throws Exception {
+		layer.onTouchEvent(new TestMotionEvent(MotionEvent.ACTION_DOWN, 1, 1));
+		layer.onGesture(Gesture.DOUBLE_TAP, new TestMotionEvent(MotionEvent.ACTION_MOVE, 1, 2));
+		layer.onTouchEvent(new TestMotionEvent(MotionEvent.ACTION_MOVE, 1, 2));
+		verify(mockViewport).scaleMap(argumentCaptor.capture(), any(float.class), any(float.class));
+		assertThat(argumentCaptor.getValue()).isGreaterThan(1);
+	}
+
+	class TestMotionEvent extends MotionEvent {
+		final int action;
+		final float x;
+		final float y;
+
+		public TestMotionEvent(int action, float x, float y) {
+			this.action = action;
+			this.x = x;
+			this.y = y;
+		}
+
+		@Override
+		public long getTime() {
+			return 0;
+		}
+
+		@Override
+		public int getAction() {
+			return action;
+		}
+
+		@Override
+		public float getX() {
+			return x;
+		}
+
+		@Override
+		public float getY() {
+			return y;
+		}
+
+		@Override
+		public float getX(int idx) {
+			return x;
+		}
+
+		@Override
+		public float getY(int idx) {
+			return y;
+		}
+
+		@Override
+		public int getPointerCount() {
+			return 0;
+		}
+	}
+}
diff --git a/vtm/src/org/oscim/layers/MapEventLayer.java b/vtm/src/org/oscim/layers/MapEventLayer.java
index 90f56cbe..ee93c40f 100644
--- a/vtm/src/org/oscim/layers/MapEventLayer.java
+++ b/vtm/src/org/oscim/layers/MapEventLayer.java
@@ -200,7 +200,7 @@ public class MapEventLayer extends Layer implements InputListener, GestureListen
 					return true;
 				}
 				// FIXME limit scale properly
-				mViewport.scaleMap(1 - my / (height / 6), 0, 0);
+				mViewport.scaleMap(1 + my / (height / 6), 0, 0);
 				mMap.updateMap(true);
 				mStartMove = -1;
 				return true;