@Test
  public void test_forceInN() {
    f1 = Values.forceInN(500);
    f2 = Values.forceInN(500);
    f3 = Values.forceInN(1000);

    assertEquals(f1, f2);
    assertEquals(f3, f2.add(f1));
    assertEquals(f1, f3.sub(f2));
    assertEquals(f3, f2.mul(2));
    assertEquals(f1, f3.div(2));
    assertEquals(Values.powerInW(2500), f2.mul(Values.speedInMpS(5)));
    assertEquals(Values.accInMss(5), f1.div(Values.massInKg(100)));
    assertEquals(Values.massInKg(100), f1.div(Values.accInMss(5)));

    assertTrue(f1.compareTo(f2) == 0);
    assertTrue(f1.compareTo(f3) == -1);
    assertTrue(f3.compareTo(f1) == 1);

    assertTrue(f1.equals(f2));

    assertTrue(!f1.isZero());
    assertTrue("500,00".equals(f1.toString()));
    assertTrue(500.0 == f1.n());
    assertTrue(0.5 == f1.kn());
  }
  @Test
  public void test_accInMss() {
    acc1 = Values.accInMss(5);
    acc2 = Values.accInMss(5);
    acc3 = Values.accInMss(10);

    assertEquals(acc1, acc2);
    assertEquals(acc3, acc1.add(acc2));
    assertEquals(acc2, acc3.sub(acc1));
    assertEquals(acc3, acc1.mul(2));
    assertEquals(acc1, acc3.div(2));

    assertTrue(acc1.compareTo(acc2) == 0);
    assertTrue(acc1.compareTo(acc3) == -1);
    assertTrue(acc3.compareTo(acc1) == 1);

    assertTrue(acc1.equals(acc1));

    assertTrue(!acc1.isZero());
    assertTrue("5,00".equals(acc1.toString()));
    assertTrue(5.0 == acc1.mss());
  }