geocell = GeocellLibrary.getSouth(geocell);
assertEquals("8e62f50", geoModelConv.fromGeocell(geocell));
geocell = GeocellLibrary.getSouth(geocell);
assertEquals("8e62dfa", geoModelConv.fromGeocell(geocell));
geocell = GeocellLibrary.getSouth(geocell);
assertEquals(sfStart, geoModelConv.fromGeocell(geocell));
assertEquals(start, geocell);
// Wander back to start.
geocell = GeocellLibrary.getWest(geocell);
geocell = GeocellLibrary.getNorth(geocell);