@Test
public void testNullManeuver() {

    mManeuverResources = new ManeuverResources(getApplicationContext(), null);
    String maneuverInstruction = mManeuverResources.getManeuverInstruction(-1);
    assertThat(maneuverInstruction, is(isEmptyString()));
    maneuverInstruction = mManeuverResources.getManeuverInstruction(0);
    assertThat(maneuverInstruction, is(isEmptyString()));
}