TestArithmeticCalculator.java :  » Parser » grammatica » net » percederberg » grammatica » test » Java Open Source

/*
 * TestArithmeticCalculator.java
 *
 * This work is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2 of the License,
 * or (at your option) any later version.
 *
 * This work 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 *
 * As a special exception, the copyright holders of this library give
 * you permission to link this library with independent modules to
 * produce an executable, regardless of the license terms of these
 * independent modules, and to copy and distribute the resulting
 * executable under terms of your choice, provided that you also meet,
 * for each linked independent module, the terms and conditions of the
 * license of that module. An independent module is a module which is
 * not derived from or based on this library. If you modify this
 * library, you may extend this exception to your version of the
 * library, but you are not obligated to do so. If you do not wish to
 * do so, delete this exception statement from your version.
 *
 * Copyright (c) 2003 Per Cederberg. All rights reserved.
 */

package net.percederberg.grammatica.test;

import java.util.HashMap;

import junit.framework.TestCase;

/**
 * A test case for the ArithmeticCalculator class.
 *
 * @author   Per Cederberg, <per at percederberg dot net>
 * @version  1.0
 */
public class TestArithmeticCalculator extends TestCase {

    /**
     * The valid input string.
     */
    private static final String VALID_INPUT =
        "1 + 2*a\n" +
        " + 345";

    /**
     * The variable bindings.
     */
    private HashMap variables = new HashMap();

    /**
     * Creates a new test case.
     * 
     * @param name           the test case name
     */
    public TestArithmeticCalculator(String name) {
        super(name);
        variables.put("a", new Integer(2));
    }

    /**
     * Tests the calculator with a valid expression.
     */
    public void testValidExpression() {
        calculate(VALID_INPUT, 350);
    }
    
    /**
     * Calculates an expression and checks the result. If the 
     * calculation failed or if the result didn't match the specified 
     * one, a test failure will be reported. 
     * 
     * @param expr           the expression to use
     * @param result         the result to expect
     */
    private void calculate(String expr, int result) {
        ArithmeticCalculator  calc;

        try {
            calc = new ArithmeticCalculator(variables);
            assertEquals("expression result", result, calc.calculate(expr));
        } catch (Exception e) {
            fail(e.getMessage());
        }
    }
}