core/tests/org.eclipse.dltk.core.tests/src/org/eclipse/dltk/core/tests/utils/MultiArrayIteratorTest.java

/*******************************************************************************
 * Copyright (c) 2012, 2017 NumberFour AG and others.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 * 
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     NumberFour AG - initial API and Implementation (Alex Panchenko)
 *******************************************************************************/
package org.eclipse.dltk.core.tests.utils;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

import org.eclipse.dltk.utils.MultiArrayIterator;
import org.junit.Assert;
import org.junit.Test;

/**
 * Tests for {@link MultiArrayIterator}
 */
public class MultiArrayIteratorTest extends Assert {

	private static <E> List<E> toList(Iterator<E> iterator) {
		final List<E> list = new ArrayList<>();
		while (iterator.hasNext()) {
			list.add(iterator.next());
		}
		return list;
	}

	@Test
	public void both() {
		assertEquals(Arrays.asList("A", "B"),
				toList(new MultiArrayIterator<>(new String[] { "A" },
						new String[] { "B" })));
	}

	@Test
	public void firstEmpty() {
		assertEquals(Arrays.asList("B"),
				toList(new MultiArrayIterator<>(new String[] {},
						new String[] { "B" })));
	}

	@Test
	public void secondEmpty() {
		assertEquals(Arrays.asList("A"),
				toList(new MultiArrayIterator<>(new String[] { "A" },
						new String[] {})));
	}

}