@Test
public void testParity_Three_UNN() {

    Point2d[] coords = new Point2d[]{new Point2d(-7.75, 5.79), // -O (up)
            new Point2d(-6.42, 3.48), // -N
            new Point2d(-9.09, 3.48), // -C
            new Point2d(-7.75, 4.25), //  C (centre)
    };
    int[] elev = new int[]{1, 0, 0, 0};
    GeometricParity parity = new Tetrahedral2DParity(coords, elev);
    org.hamcrest.MatcherAssert.assertThat(parity.parity(), is(CLOCKWISE));
}