@Test
public void testGetPositionX() {

  assertTrue(oS1.reqPositionX() == 0);
  assertTrue(oS2.reqPositionX() == 0);
  assertTrue(oS3.reqPositionX() == 50);
  assertTrue(oS4.reqPositionX() == 50);
  assertTrue(oS5.reqPositionX() == 0);
  assertTrue(oS6.reqPositionX() == 300);
}