@Test
public void testGetPositionXProperty() {

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