SimpleStackTests.java

/*******************************************************************************
 * Copyright (c) 1998, 2015 Oracle and/or its affiliates. All rights reserved.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
 * which accompanies this distribution.
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 *     Oracle - initial API and implementation from Oracle TopLink
******************************************************************************/
package org.eclipse.persistence.tools.workbench.test.utility;

import java.util.EmptyStackException;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

import org.eclipse.persistence.tools.workbench.utility.SimpleStack;
import org.eclipse.persistence.tools.workbench.utility.Stack;

public class SimpleStackTests extends TestCase {

    public static Test suite() {
        return new TestSuite(SimpleStackTests.class);
    }

    public SimpleStackTests(String name) {
        super(name);
    }

    public void testIsEmpty() {
        Stack stack = new SimpleStack();
        assertTrue(stack.isEmpty());
        stack.push("first");
        assertFalse(stack.isEmpty());
        stack.push("second");
        assertFalse(stack.isEmpty());
        stack.pop();
        assertFalse(stack.isEmpty());
        stack.pop();
        assertTrue(stack.isEmpty());
    }

    public void testPushAndPop() {
        Stack stack = new SimpleStack();
        String first = "first";
        String second = "second";

        stack.push(first);
        stack.push(second);
        assertEquals(second, stack.pop());
        assertEquals(first, stack.pop());
    }

    public void testPushAndPeek() {
        Stack stack = new SimpleStack();
        String first = "first";
        String second = "second";

        stack.push(first);
        stack.push(second);
        assertEquals(second, stack.peek());
        assertEquals(second, stack.peek());
        assertEquals(second, stack.pop());
        assertEquals(first, stack.peek());
        assertEquals(first, stack.peek());
        assertEquals(first, stack.pop());
    }

    public void testEmptyStackExceptionPeek() {
        Stack stack = new SimpleStack();
        String first = "first";
        String second = "second";

        stack.push(first);
        stack.push(second);
        assertEquals(second, stack.peek());
        assertEquals(second, stack.pop());
        assertEquals(first, stack.peek());
        assertEquals(first, stack.pop());

        boolean exCaught = false;
        try {
            stack.peek();
        } catch (EmptyStackException ex) {
            exCaught = true;
        }
        assertTrue(exCaught);
    }

    public void testEmptyStackExceptionPop() {
        Stack stack = new SimpleStack();
        String first = "first";
        String second = "second";

        stack.push(first);
        stack.push(second);
        assertEquals(second, stack.peek());
        assertEquals(second, stack.pop());
        assertEquals(first, stack.peek());
        assertEquals(first, stack.pop());

        boolean exCaught = false;
        try {
            stack.pop();
        } catch (EmptyStackException ex) {
            exCaught = true;
        }
        assertTrue(exCaught);
    }

    public void testClone() {
        SimpleStack stack = new SimpleStack();
        stack.push("first");
        stack.push("second");
        stack.push("third");

        this.verifyClone(stack, (SimpleStack) stack.clone());
    }

    public void testSerialization() throws Exception {
        SimpleStack stack = new SimpleStack();
        stack.push("first");
        stack.push("second");
        stack.push("third");

        this.verifyClone(stack, (SimpleStack) TestTools.serialize(stack));
    }

    private void verifyClone(Stack original, Stack clone) {
        assertNotSame(original, clone);
        assertEquals(original.peek(), clone.peek());
        assertEquals(original.pop(), clone.pop());
        assertEquals(original.peek(), clone.peek());
        assertEquals(original.pop(), clone.pop());
        assertEquals(original.isEmpty(), clone.isEmpty());
        assertEquals(original.peek(), clone.peek());
        assertEquals(original.pop(), clone.pop());
        assertTrue(original.isEmpty());
        assertEquals(original.isEmpty(), clone.isEmpty());

        original.push("fourth");
        assertFalse(original.isEmpty());
        // clone should still be empty
        assertTrue(clone.isEmpty());
    }

}