@Test
public void smoothingSinglePointReturnsThatPoint() {

	double[] data = { Math.PI };
	LoessSmoother loess = new LoessSmoother.Builder().setWidth(3).setData(data).build();
	double[] smoothed = loess.smooth();
	assertEquals(1, smoothed.length);
	assertEquals(Math.PI, smoothed[0], Math.ulp(Math.PI));
}