COMMONS_JEXL_2_0/src/test/java/org/apache/commons/jexl2/WhileTest.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.jexl2;

/**
 * Tests for while statement.
 * @author Dion Gillard
 * @since 1.1
 */
public class WhileTest extends JexlTestCase {

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

    public void testSimpleWhileFalse() throws Exception {
        Expression e = JEXL.createExpression("while (false) ;");
        JexlContext jc = new MapContext();

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

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

    public void testWhileWithBlock() throws Exception {
        Expression e = JEXL.createExpression("while (x < 10) { x = x + 1; y = y * 2; }");
        JexlContext jc = new MapContext();
        jc.set("x", new Integer(1));
        jc.set("y", new Integer(1));

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