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Java example source code file (IncrementorTest.java)

This example Java source code file (IncrementorTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

deprecated, incrementor, incrementortest, maxcountexceededexception, test, toomanyevaluationsexception

The IncrementorTest.java Java example source code

/*
 * 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.math3.util;

import org.apache.commons.math3.exception.MaxCountExceededException;
import org.apache.commons.math3.exception.TooManyEvaluationsException;
import org.junit.Assert;
import org.junit.Test;

/**
 * Test for {@link Incrementor}.
 * @deprecated as of 3.6, Incrementor is deprecated
 */
@Deprecated
public class IncrementorTest {
    @Test
    public void testConstructor1() {
        final Incrementor i = new Incrementor();
        Assert.assertEquals(0, i.getMaximalCount());
        Assert.assertEquals(0, i.getCount());
    }

    @Test
    public void testConstructor2() {
        final Incrementor i = new Incrementor(10);
        Assert.assertEquals(10, i.getMaximalCount());
        Assert.assertEquals(0, i.getCount());
    }

    @Test
    public void testCanIncrement1() {
        final Incrementor i = new Incrementor(3);
        Assert.assertTrue(i.canIncrement());
        i.incrementCount();
        Assert.assertTrue(i.canIncrement());
        i.incrementCount();
        Assert.assertTrue(i.canIncrement());
        i.incrementCount();
        Assert.assertFalse(i.canIncrement());
    }

    @Test
    public void testCanIncrement2() {
        final Incrementor i = new Incrementor(3);
        while (i.canIncrement()) {
            i.incrementCount();
        }

        // Must keep try/catch because the exception must be generated here,
        // and not in the previous loop.
        try {
            i.incrementCount();
            Assert.fail("MaxCountExceededException expected");
        } catch (MaxCountExceededException e) {
            // Expected.
        }
    }

    @Test
    public void testAccessor() {
        final Incrementor i = new Incrementor();

        i.setMaximalCount(10);
        Assert.assertEquals(10, i.getMaximalCount());
        Assert.assertEquals(0, i.getCount());
    }

    @Test
    public void testBelowMaxCount() {
        final Incrementor i = new Incrementor();

        i.setMaximalCount(3);
        i.incrementCount();
        i.incrementCount();
        i.incrementCount();

        Assert.assertEquals(3, i.getCount());
    }

    @Test(expected=MaxCountExceededException.class)
    public void testAboveMaxCount() {
        final Incrementor i = new Incrementor();

        i.setMaximalCount(3);
        i.incrementCount();
        i.incrementCount();
        i.incrementCount();
        i.incrementCount();
    }

    @Test(expected=TooManyEvaluationsException.class)
    public void testAlternateException() {
        final Incrementor.MaxCountExceededCallback cb
            = new Incrementor.MaxCountExceededCallback() {
                    /** {@inheritDoc} */
                    public void trigger(int max) {
                        throw new TooManyEvaluationsException(max);
                    }
                };

        final Incrementor i = new Incrementor(0, cb);
        i.incrementCount();
    }

    @Test
    public void testReset() {
        final Incrementor i = new Incrementor();

        i.setMaximalCount(3);
        i.incrementCount();
        i.incrementCount();
        i.incrementCount();
        Assert.assertEquals(3, i.getCount());
        i.resetCount();
        Assert.assertEquals(0, i.getCount());
    }

    @Test
    public void testBulkIncrement() {
        final Incrementor i = new Incrementor();

        i.setMaximalCount(3);
        i.incrementCount(2);
        Assert.assertEquals(2, i.getCount());
        i.incrementCount(1);
        Assert.assertEquals(3, i.getCount());
    }
}

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