/*
 * This is eMonocot, a global online biodiversity information resource.
 *
 * Copyright © 2011–2015 The Board of Trustees of the Royal Botanic Gardens, Kew and The University of Oxford
 *
 * eMonocot is free software: you can redistribute it and/or modify it under the terms of the
 * GNU Affero General Public License as published by the Free Software Foundation, either version 3
 * of the License, or (at your option) any later version.
 *
 * eMonocot is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * The complete text of the GNU Affero General Public License is in the source repository as the file
 * ‘COPYING’.  It is also available from <http://www.gnu.org/licenses/>.
 */
package org.emonocot.harvest.common;

import static org.junit.Assert.*;

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

import org.easymock.EasyMock;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.batch.item.ItemReader;

/**
 * @author jk00kg
 *
 */
public class CompositeItemReaderTest {

	List<ItemReader<Object>> delegates;

	/**
	 * @throws java.lang.Exception
	 */
	@SuppressWarnings("unchecked")
	@Before
	public void setUp() throws Exception {
		delegates = new ArrayList<>();
		for (int i = 0; i < 2; i++) {
			delegates.add((ItemReader<Object>) EasyMock.createMock(ItemReader.class));
		}
	}

	/**
	 * @throws java.lang.Exception
	 */
	@After
	public void tearDown() throws Exception {
	}

	/**
	 * Test method for {@link org.emonocot.harvest.common.CompositeItemReader#read()}.
	 */
	@Test
	public void testRead() throws Exception {
		ItemReader<Object> mock1 = delegates.get(0);
		ItemReader<Object> mock2 = delegates.get(1);
		EasyMock.expect(mock1.read()).andReturn("from 1st delegate");
		EasyMock.expect(mock1.read()).andReturn("from 1st delegate");
		EasyMock.expect(mock1.read()).andReturn(null);
		EasyMock.expect(mock2.read()).andReturn("from 2nd delegate");
		EasyMock.expect(mock2.read()).andReturn(null);
		EasyMock.replay(mock1,mock2);
		CompositeItemReader<Object> composite = new CompositeItemReader<>();
		composite.setDelegates(delegates);

		for (int i = 1; i <= 2; i++) {
			assertEquals("Read " + (i) + " should have returned an object", "from 1st delegate", composite.read());
		}
		assertEquals("Read 3 should have returned an object", "from 2nd delegate", composite.read());
		assertNull("There should be no more items to read", composite.read());
	}

	//Test case of a preceding delegate with no records but a later one does

}