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 * Image processing operations for SciJava Ops.
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package org.scijava.ops.image.topology.eulerCharacteristic;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;

import net.imglib2.RandomAccess;
import net.imglib2.img.Img;
import net.imglib2.img.array.ArrayImgs;
import net.imglib2.type.logic.BitType;

import org.junit.jupiter.api.Test;

/**
 * Unit tests for the {@link Octant} convenience class
 *
 * @author Richard Domander (Royal Veterinary College, London)
 */
public class OctantTest {

	@Test
	public void testIsNeighborhoodEmpty() throws Exception {
		final Img<BitType> img = ArrayImgs.bits(2, 2, 2);
		Octant<BitType> octant = new Octant<>(img);

		octant.setNeighborhood(1, 1, 1);

		assertTrue(octant.isNeighborhoodEmpty(), "Neighborhood should be empty");

		img.forEach(BitType::setOne);
		octant.setNeighborhood(1, 1, 1);

		assertFalse(octant.isNeighborhoodEmpty(),
			"Neighborhood should not be empty");
	}

	@Test
	public void testSetNeighborhood() throws Exception {
		final Img<BitType> img = ArrayImgs.bits(3, 3, 3);
		Octant<BitType> octant = new Octant<>(img);

		final RandomAccess<BitType> access = img.randomAccess();
		for (int z = 0; z < 2; z++) {
			access.setPosition(z, 2);
			for (int y = 0; y < 2; y++) {
				access.setPosition(y, 1);
				for (int x = 0; x < 2; x++) {
					access.setPosition(x, 0);
					access.get().setOne();
				}
			}
		}

		octant.setNeighborhood(1, 1, 1);
		assertEquals(8, octant.getNeighborCount(),
			"All neighbours should be foreground");

		octant.setNeighborhood(2, 2, 2);
		assertEquals(1, octant.getNeighborCount(),
			"Wrong number of foreground neighbors");
	}
}
