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package it.unimi.dsi.fastutil.objects;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.util.Random;

import it.unimi.dsi.fastutil.Hash;
import it.unimi.dsi.fastutil.bytes.ByteArrays;

import org.junit.Test;

public class ObjectOpenCustomHashSetTest {

	@Test
	public void testGetNullKey() {
		final ObjectOpenCustomHashSet s = new ObjectOpenCustomHashSet(new Hash.Strategy() {

			@Override
			public int hashCode(Integer o) {
				return o == null ? 0 : o.intValue() % 10;
			}

			@Override
			public boolean equals(Integer a, Integer b) {
				if (((a == null) != (b == null)) || a == null) return false;
				return ((a.intValue() - b.intValue()) % 10) == 0;
			}
		});

		s.add(Integer.valueOf(10));
		assertTrue(s.contains(Integer.valueOf(0)));
		assertEquals(10, s.iterator().next().intValue());
	}

	@Test
	public void testNullKey() {
		Random random = new Random(0);
		ObjectOpenCustomHashSet s = new ObjectOpenCustomHashSet(ByteArrays.HASH_STRATEGY);
		for(int i = 0; i < 1000000; i++) {
			byte[] a = new byte[random.nextInt(10)];
			for(int j = a.length; j-- != 0;) a[j] = (byte) random.nextInt(4);
			s.add(a);
		}
	}

}