home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (IntegerSequenceTest.java)

This example Java source code file (IntegerSequenceTest.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

arraylist, integer, integersequencetest, list, maxcountexceededexception, runtimeexception, test, toomanyevaluationsexception, util

The IntegerSequenceTest.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 java.util.List;
import java.util.ArrayList;
import org.apache.commons.math3.exception.MaxCountExceededException;
import org.apache.commons.math3.exception.TooManyEvaluationsException;
import org.apache.commons.math3.exception.NotStrictlyPositiveException;
import org.apache.commons.math3.exception.ZeroException;
import org.junit.Assert;
import org.junit.Test;

/**
 * Tests for {@link IntegerSequence} and {@link IntegerSequence#Incrementor}.
 */
public class IntegerSequenceTest {
    @Test
    public void testRangeMultipleIterations() {
        // Check that we can iterate several times using the same instance.
        final int start = 1;
        final int max = 7;
        final int step = 2;

        final List<Integer> seq = new ArrayList();
        final IntegerSequence.Range r = IntegerSequence.range(start, max, step);

        final int numTimes = 3;
        for (int n = 0; n < numTimes; n++) {
            seq.clear();
            for (Integer i : r) {
                seq.add(i);
            }
            Assert.assertEquals(4, seq.size());
            Assert.assertEquals(seq.size(), r.size());
        }
    }

    @Test
    public void testIncreasingRange() {
        final int start = 1;
        final int max = 7;
        final int step = 2;

        final List<Integer> seq = new ArrayList();
        final IntegerSequence.Range r = IntegerSequence.range(start, max, step);
        for (Integer i : r) {
            seq.add(i);
        }

        Assert.assertEquals(4, seq.size());
        Assert.assertEquals(seq.size(), r.size());
        for (int i = 0; i < seq.size(); i++) {
            Assert.assertEquals(start + i * step, seq.get(i).intValue());
        }
    }

    @Test
    public void testIncreasingRangeNegativeEnd() {
        final int start = -10;
        final int max = -1;
        final int step = 2;

        final List<Integer> seq = new ArrayList();
        final IntegerSequence.Range r = IntegerSequence.range(start, max, step);
        for (Integer i : r) {
            seq.add(i);
        }

        Assert.assertEquals(5, seq.size());
        Assert.assertEquals(seq.size(), r.size());
        for (int i = 0; i < seq.size(); i++) {
            Assert.assertEquals(start + i * step, seq.get(i).intValue());
        }
    }

    @Test
    public void testDecreasingRange() {
        final int start = 10;
        final int max = -8;
        final int step = -3;

        final List<Integer> seq = new ArrayList();
        final IntegerSequence.Range r = IntegerSequence.range(start, max, step);
        for (Integer i : r) {
            seq.add(i);
        }

        Assert.assertEquals(7, seq.size());
        Assert.assertEquals(seq.size(), r.size());
        for (int i = 0; i < seq.size(); i++) {
            Assert.assertEquals(start + i * step, seq.get(i).intValue());
        }
    }

    @Test
    public void testSingleElementRange() {
        final int start = 1;
        final int max = 1;
        final int step = -1;

        final List<Integer> seq = new ArrayList();
        final IntegerSequence.Range r = IntegerSequence.range(start, max, step);
        for (Integer i : r) {
            seq.add(i);
        }

        Assert.assertEquals(1, seq.size());
        Assert.assertEquals(seq.size(), r.size());
        Assert.assertEquals(start, seq.get(0).intValue());
    }

    @Test
    public void testBasicRange() {
        final int start = -2;
        final int end = 4;

        final List<Integer> seq = new ArrayList();
        for (Integer i : IntegerSequence.range(start, end)) {
            seq.add(i);
        }

        for (int i = start; i <= end; i++) {
            Assert.assertEquals(i, seq.get(i - start).intValue());
        }
    }

    @Test
    public void testEmptyRange() {
        final int start = 2;
        final int end = 0;

        final List<Integer> seq = new ArrayList();
        final IntegerSequence.Range r = IntegerSequence.range(start, end);
        for (Integer i : r) {
            seq.add(i);
        }

        Assert.assertEquals(0, seq.size());
        Assert.assertEquals(seq.size(), r.size());
    }

    @Test
    public void testEmptyRangeNegativeStart() {
        final int start = -2;
        final int max = -1;
        final int step = -1;

        final List<Integer> seq = new ArrayList();
        final IntegerSequence.Range r = IntegerSequence.range(start, max, step);
        for (Integer i : r) {
            seq.add(i);
        }

        Assert.assertEquals(0, seq.size());
        Assert.assertEquals(seq.size(), r.size());
    }

    @Test(expected=MaxCountExceededException.class)
    public void testIncrementorCountExceeded() {
        final int start = 1;
        final int max = 7;
        final int step = 2;

        final IntegerSequence.Incrementor inc =
            IntegerSequence.Incrementor.create()
            .withStart(start)
            .withMaximalCount(max)
            .withIncrement(step);

        Assert.assertTrue(inc.canIncrement(2));
        Assert.assertFalse(inc.canIncrement(3));

        while (true) {
            inc.increment();
        }
    }

    @Test
    public void testCanIncrementZeroTimes() {
        final int start = 1;
        final int max = 2;
        final int step = 1;

        final IntegerSequence.Incrementor inc
            = IntegerSequence.Incrementor.create()
            .withStart(start)
            .withMaximalCount(max)
            .withIncrement(step);

        Assert.assertTrue(inc.canIncrement(0));
    }

    @Test(expected=NotStrictlyPositiveException.class)
    public void testIncrementZeroTimes() {
        final int start = 1;
        final int max = 2;
        final int step = 1;

        final IntegerSequence.Incrementor inc
            = IntegerSequence.Incrementor.create()
            .withStart(start)
            .withMaximalCount(max)
            .withIncrement(step);

        inc.increment(0);
    }

    @Test(expected=ZeroException.class)
    public void testIncrementZeroStep() {
        final int step = 0;
        IntegerSequence.Incrementor.create().withIncrement(step);
    }

    @Test
    public void testIteratorZeroElement() {
        final int start = 1;
        final int max = 1;
        final int step = 1;

        final IntegerSequence.Incrementor inc
            = IntegerSequence.Incrementor.create()
            .withStart(start)
            .withMaximalCount(max)
            .withIncrement(step);

        Assert.assertFalse(inc.hasNext());
        try {
            inc.increment();
            Assert.fail("exception expected");
        } catch (MaxCountExceededException e) {
            // Expected.
        }
    }

    @Test(expected=TooManyEvaluationsException.class)
    public void testIncrementorAlternateException() {
        final int start = 1;
        final int max = 2;
        final int step = 1;

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

        final IntegerSequence.Incrementor inc
            = IntegerSequence.Incrementor.create()
            .withStart(start)
            .withMaximalCount(max)
            .withIncrement(step)
            .withCallback(cb);

        try {
            // One call must succeed.
            inc.increment();
        } catch (RuntimeException e) {
            Assert.fail("unexpected exception");
        }

        // Second call must fail.
        inc.increment();
    }
}

Other Java examples (source code examples)

Here is a short list of links related to this Java IntegerSequenceTest.java source code file:



my book on functional programming

 

new blog posts

 

Copyright 1998-2019 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.