/*
 * Copyright 2002-2006 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.commons.jexl;

import junit.framework.TestCase;
/**
 * Tests for while statement.
 * @author Dion Gillard
 * @since 1.1
 */
public class WhileTest extends TestCase {

    public WhileTest(String testName) {
        super(testName);
    }

    public void testSimpleWhileFalse() throws Exception {
        Expression e = ExpressionFactory.createExpression("while (false) ;");
        JexlContext jc = JexlHelper.createContext();

        Object o = e.evaluate(jc);
        assertNull("Result is not null", o);
    }
    
    public void testWhileExecutesExpressionWhenLooping() throws Exception {
        Expression e = ExpressionFactory.createExpression("while (x < 10) x = x + 1;");
        JexlContext jc = JexlHelper.createContext();
        jc.getVars().put("x", new Integer(1));

        Object o = e.evaluate(jc);
        assertEquals("Result is wrong", new Long(10), o);
    }

    public void testWhileWithBlock() throws Exception {
        Expression e = ExpressionFactory.createExpression("while (x < 10) { x = x + 1; y = y * 2; }");
        JexlContext jc = JexlHelper.createContext();
        jc.getVars().put("x", new Integer(1));
        jc.getVars().put("y", new Integer(1));

        Object o = e.evaluate(jc);
        assertEquals("Result is wrong", new Long(512), o);
        assertEquals("x is wrong", new Long(10), jc.getVars().get("x"));
        assertEquals("y is wrong", new Long(512), jc.getVars().get("y"));
    }
}