@Test
  public final void testShiftOnArrow() {

    vectorDefinition.shiftOnArrow(TestShiftValue);
    assertEquals(
        TestInitX2 - TestInitX1,
        vectorDefinition.getX2() - vectorDefinition.getX1(),
        NoDifferenceAllowed);
    assertEquals(
        TestInitY2 - TestInitY1,
        vectorDefinition.getY2() - vectorDefinition.getY1(),
        NoDifferenceAllowed);
  }
 @Test
 public final void testSetX1() {
   vectorDefinition.setX1(TestNewX1);
   assertEquals(TestNewX1, vectorDefinition.getX1(), NoDifferenceAllowed);
 }
 @Test
 public final void testGetX1() {
   assertEquals(TestInitX1, vectorDefinition.getX1(), NoDifferenceAllowed);
 }