/*
 * FindBugs - Find Bugs in Java programs
 * Copyright (C) 2007, University of Maryland
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package edu.umd.cs.findbugs.ba.npe;

import junit.framework.Assert;
import junit.framework.TestCase;
import edu.umd.cs.findbugs.ba.DataflowAnalysisException;

/**
 * Test cases for ReturnPathType class.
 * 
 * @author David Hovemeyer
 */
public class ReturnPathTypeTest extends TestCase {
	ReturnPathType top;
	ReturnPathType normal;
	ReturnPathType abnormal;

	/* (non-Javadoc)
	 * @see junit.framework.TestCase#setUp()
	 */
	@Override
	protected void setUp() throws Exception {
		top = new ReturnPathType();
		normal = new ReturnPathType();
		normal.setCanReturnNormally(true);
		abnormal = new ReturnPathType();
		abnormal.setCanReturnNormally(false);
	}

	public void testTop() throws Exception {
		Assert.assertFalse(top.isValid());
		Assert.assertTrue(top.isTop());
		try {
			top.canReturnNormally();// should throw exception
			Assert.assertTrue(false);
		} catch (DataflowAnalysisException e) {
			// Good
		}
	}

	public void testCanReturnNormally() throws Exception {
		Assert.assertTrue(normal.isValid());
		Assert.assertTrue(normal.canReturnNormally());
	}

	public void testCannotReturnNormally() throws Exception {
		Assert.assertTrue(abnormal.isValid());
		Assert.assertFalse(abnormal.canReturnNormally());
	}

	public void testMergeWithTop() throws Exception {
		normal.mergeWith(top);
		Assert.assertTrue(normal.canReturnNormally());
		abnormal.mergeWith(top);
		Assert.assertFalse(abnormal.canReturnNormally());
	}

	public void testTopMergeWithNormalReturn() throws Exception {
		top.mergeWith(normal);
		Assert.assertTrue(top.canReturnNormally());
	}

	public void testTopMergeWithAbnormalReturn() throws Exception {
		top.mergeWith(abnormal);
		Assert.assertFalse(top.canReturnNormally());
	}

	public void testNormalMergeWIthAbnormal() throws Exception {
		normal.mergeWith(abnormal);
		Assert.assertTrue(normal.canReturnNormally());
	}

	public void testAbnormalMergeWithNormal() throws Exception {
		abnormal.mergeWith(normal);
		Assert.assertTrue(abnormal.canReturnNormally());
	}

	public void testNormalMergeWithNormal() throws Exception {
		ReturnPathType otherNormal = new ReturnPathType();
		otherNormal.setCanReturnNormally(true);

		normal.mergeWith(otherNormal);
		Assert.assertTrue(normal.canReturnNormally());
	}

	public void testAbnormalMergeWithAbnormal() throws Exception {
		ReturnPathType otherAbnormal = new ReturnPathType();
		otherAbnormal.setCanReturnNormally(false);

		abnormal.mergeWith(otherAbnormal);
		Assert.assertFalse(abnormal.canReturnNormally());
	}
}