@Test
public void testNewUnitVectors() throws Exception {

    IAtom fromAtom = mock(IAtom.class);
    IAtom toAtom1 = mock(IAtom.class);
    IAtom toAtom2 = mock(IAtom.class);
    IAtom toAtom3 = mock(IAtom.class);
    when(fromAtom.getPoint2d()).thenReturn(new Point2d(4, 2));
    when(toAtom1.getPoint2d()).thenReturn(new Point2d(-5, 3));
    when(toAtom2.getPoint2d()).thenReturn(new Point2d(6, -4));
    when(toAtom3.getPoint2d()).thenReturn(new Point2d(7, 5));
    List<Vector2d> vectors = VecmathUtil.newUnitVectors(fromAtom, Arrays.asList(toAtom1, toAtom2, toAtom3));
    assertThat(vectors.size(), is(3));
    assertThat(vectors.get(0).x, closeTo(-0.993, 0.01));
    assertThat(vectors.get(0).y, closeTo(0.110, 0.01));
    assertThat(vectors.get(1).x, closeTo(0.316, 0.01));
    assertThat(vectors.get(1).y, closeTo(-0.948, 0.01));
    assertThat(vectors.get(2).x, closeTo(0.707, 0.01));
    assertThat(vectors.get(2).y, closeTo(0.707, 0.01));
}