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

import static java.util.Collections.shuffle;
import static org.junit.jupiter.api.Assertions.assertEquals;

import java.util.ArrayList;
import java.util.List;

import org.scijava.ops.image.AbstractOpTest;
import org.scijava.ops.image.util.TestImgGeneration;
import net.imglib2.img.Img;
import net.imglib2.type.numeric.RealType;
import net.imglib2.type.numeric.integer.UnsignedByteType;
import net.imglib2.type.numeric.real.DoubleType;

import org.junit.jupiter.api.Test;

/**
 * Tests for {@link DefaultMedian}
 *
 * @author Brian Northan
 * @author Richard Domander
 */
public class DefaultMedianTest extends AbstractOpTest {

	@Test
	public void testOneElement() {
		final List<RealType<DoubleType>> numbers = new ArrayList<>();
		numbers.add(new DoubleType(1.0));

		final DoubleType result = new DoubleType();
		ops.op("stats.median").input(numbers).output(result).compute();

		assertEquals(numbers.get(0).getRealDouble(), result.getRealDouble(), 1e-12);
	}

	@Test
	public void testOddN() {
		final List<RealType<DoubleType>> numbers = new ArrayList<>();
		numbers.add(new DoubleType(1.0));
		numbers.add(new DoubleType(2.0));
		numbers.add(new DoubleType(3.0));
		numbers.add(new DoubleType(4.0));
		numbers.add(new DoubleType(5.0));
		shuffle(numbers);

		final DoubleType result = new DoubleType();
		ops.op("stats.median").input(numbers).output(result).compute();

		assertEquals(3.0, result.getRealDouble(), 1e-12);
	}

	@Test
	public void testEvenN() {
		final List<RealType<DoubleType>> numbers = new ArrayList<>();
		numbers.add(new DoubleType(1.0));
		numbers.add(new DoubleType(2.0));
		numbers.add(new DoubleType(3.0));
		numbers.add(new DoubleType(4.0));
		shuffle(numbers);

		final DoubleType result = new DoubleType();
		ops.op("stats.median").input(numbers).output(result).compute();

		assertEquals(2.5, result.getRealDouble(), 1e-12);
	}

	@Test
	public void testRandomImg() {
		final Img<UnsignedByteType> randomlyFilledImg = TestImgGeneration
			.randomlyFilledUnsignedByteWithSeed(new long[] { 100, 100 }, 1234567890L);

		final DoubleType result = new DoubleType();
		ops.op("stats.median").input(randomlyFilledImg).output(result).compute();

		assertEquals(128d, result.getRealDouble(), 0.00001d);
	}
}
