### Question:
GridTraversal implements Spliterator<double[]> { static boolean isNearZero(double ordinate) { return -EPSILON <= ordinate && ordinate <= EPSILON; } private  GridTraversal(PointList trajectory); private  GridTraversal(final PointList trajectory, final int startPoint, final int endPoint); @Override boolean tryAdvance(Consumer<? super double[]> action); @Override Spliterator<double[]> trySplit(); @Override long estimateSize(); @Override int characteristics(); static Stream<double[]> stream(final double[] trajectory, final int dimension, final boolean includeStart, final boolean parallel);  }### Answer:
@Test public void testZeroCheck() { assertTrue( isNearZero( 1e-8)); assertTrue( isNearZero(- 1e-8)); assertTrue( isNearZero( 1e-9)); assertTrue( isNearZero(- 1e-9)); assertTrue( isNearZero( 42e-10)); assertTrue( isNearZero(-22e-10)); assertFalse(isNearZero( 1e-7)); assertFalse(isNearZero(- 1e-7)); assertFalse(isNearZero( 1e-4)); assertFalse(isNearZero(- 1e-4)); }