Fix unit tests with TrackPathDescriptor.

In MapOverlay, for testing, expose a getter and a setter
for TrackPathDescriptor instead of newPath and getLastPath.

In SingleColorTrackPathPainter, refactor "new Path" to a
newPath method so that tests can override the newPath method
to provide a mockPath.

MyTracksTest/src/com/google/android/apps/mytracks/maps/TrackPathDescriptorDynamicSpeedTest.java

@@ -35,7 +35,10 @@ public class TrackPathDescriptorDynamicSpeedTest extends TrackPathPainterTestCas
       myTracksOverlay.addLocation(location);
     }
     
-    TrackPathPainter painter = new DynamicSpeedTrackPathPainter(getContext(), new DynamicSpeedTrackPathDescriptor(getContext()));
+    TrackPathPainter painter = new DynamicSpeedTrackPathPainter(
+        getContext(), new DynamicSpeedTrackPathDescriptor(getContext()));
+    myTracksOverlay.setTrackPathPainter(painter);
+    
     int startLocationIdx = 0;
     Boolean alwaysVisible = true;
     
@@ -43,6 +46,7 @@ public class TrackPathDescriptorDynamicSpeedTest extends TrackPathPainterTestCas
     painter.updatePath(myTracksOverlay.getMapProjection(mockView), 
         myTracksOverlay.getMapViewRect(mockView), startLocationIdx, alwaysVisible,
         myTracksOverlay.getPoints());
+    assertNotNull(myTracksOverlay.getTrackPathPainter().getLastPath());
     painter.drawTrack(canvas);    
   }
 }

MyTracksTest/src/com/google/android/apps/mytracks/maps/TrackPathDescriptorFixedSpeedTest.java

@@ -35,7 +35,10 @@ public class TrackPathDescriptorFixedSpeedTest extends TrackPathPainterTestCase
       myTracksOverlay.addLocation(location);
     }
     
-    TrackPathPainter painter = new DynamicSpeedTrackPathPainter(getContext(), new FixedSpeedTrackPathDescriptor(getContext()));
+    TrackPathPainter painter = new DynamicSpeedTrackPathPainter(
+        getContext(), new FixedSpeedTrackPathDescriptor(getContext()));
+    myTracksOverlay.setTrackPathPainter(painter);
+    
     int startLocationIdx = 0;
     Boolean alwaysVisible = true;
     
@@ -43,6 +46,7 @@ public class TrackPathDescriptorFixedSpeedTest extends TrackPathPainterTestCase
     painter.updatePath(myTracksOverlay.getMapProjection(mockView), 
         myTracksOverlay.getMapViewRect(mockView), startLocationIdx, alwaysVisible,
         myTracksOverlay.getPoints());
+    assertNotNull(myTracksOverlay.getTrackPathPainter().getLastPath());
     painter.drawTrack(canvas);
   }
 }

MyTracksTest/src/com/google/android/apps/mytracks/maps/TrackPathPainterFactoryTest.java

@@ -63,6 +63,7 @@ public class TrackPathPainterFactoryTest extends TrackPathPainterTestCase {
     Boolean alwaysVisible = true;
     
     TrackPathPainter painter = TrackPathPainterFactory.getTrackPathPainter(context);
+    myTracksOverlay.setTrackPathPainter(painter);
     
     assertNotNull(painter);
     assertTrue(c.isInstance(painter));
@@ -70,6 +71,7 @@ public class TrackPathPainterFactoryTest extends TrackPathPainterTestCase {
     painter.updatePath(myTracksOverlay.getMapProjection(mockView), 
         myTracksOverlay.getMapViewRect(mockView), startLocationIdx, alwaysVisible,
         myTracksOverlay.getPoints());
+    assertNotNull(myTracksOverlay.getTrackPathPainter().getLastPath());      
     painter.drawTrack(canvas);
   }
 }

MyTracksTest/src/com/google/android/apps/mytracks/maps/TrackPathPainterSingleColorTest.java

@@ -36,6 +36,8 @@ public class TrackPathPainterSingleColorTest extends TrackPathPainterTestCase {
     }
     
     TrackPathPainter painter = new SingleColorTrackPathPainter(getContext());
+    myTracksOverlay.setTrackPathPainter(painter);
+    
     int startLocationIdx = 0;
     Boolean alwaysVisible = true;
     
@@ -43,6 +45,7 @@ public class TrackPathPainterSingleColorTest extends TrackPathPainterTestCase {
     painter.updatePath(myTracksOverlay.getMapProjection(mockView), 
         myTracksOverlay.getMapViewRect(mockView), startLocationIdx, alwaysVisible,
         myTracksOverlay.getPoints());
+    assertNotNull(myTracksOverlay.getTrackPathPainter().getLastPath());
     painter.drawTrack(canvas);
   }
 }