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Commons Codec example source code file (StringUtilsTest.java)

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

Java - Commons Codec tags/keywords

bytes_fixture, illegalstateexception, io, iso-8859-1, string, string, unknown, unsupportedencodingexception, unsupportedencodingexception, us-ascii, us-ascii, utf-16, utf-16be, utf-8, utf-8, util

The Commons Codec StringUtilsTest.java 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.codec.binary;

import java.io.UnsupportedEncodingException;
import java.util.Arrays;

import junit.framework.Assert;
import junit.framework.TestCase;

/**
 * Tests {@link StringUtils}
 * 
 * @author <a href="mailto:ggregory@seagullsw.com">Gary Gregory
 * @version $Id: StringUtilsTest.java 801391 2009-08-05 19:55:54Z ggregory $
 */
public class StringUtilsTest extends TestCase {

    private static byte[] BYTES_FIXTURE;

    private static final String STRING_FIXTURE = "ABC";

    {
        try {
            BYTES_FIXTURE = "abc".getBytes("US-ASCII");
        } catch (UnsupportedEncodingException e) {
            throw new IllegalArgumentException(e.toString());
        }
    }

    /**
     * We could make the constructor private but there does not seem to be a point to jumping through extra code hoops
     * to restrict instantiation right now.
     */
    public void testConstructor() {
        new StringUtils();
    }

    public void testGetBytesIso8859_1() throws UnsupportedEncodingException {
        String charsetName = "ISO-8859-1";
        testGetBytesUnchecked(charsetName);
        byte[] expected = STRING_FIXTURE.getBytes(charsetName);
        byte[] actual = StringUtils.getBytesIso8859_1(STRING_FIXTURE);
        Assert.assertTrue(Arrays.equals(expected, actual));
    }

    private void testGetBytesUnchecked(String charsetName) throws UnsupportedEncodingException {
        byte[] expected = STRING_FIXTURE.getBytes(charsetName);
        byte[] actual = StringUtils.getBytesUnchecked(STRING_FIXTURE, charsetName);
        Assert.assertTrue(Arrays.equals(expected, actual));
    }

    public void testGetBytesUsAscii() throws UnsupportedEncodingException {
        String charsetName = "US-ASCII";
        testGetBytesUnchecked(charsetName);
        byte[] expected = STRING_FIXTURE.getBytes(charsetName);
        byte[] actual = StringUtils.getBytesUsAscii(STRING_FIXTURE);
        Assert.assertTrue(Arrays.equals(expected, actual));
    }

    public void testGetBytesUtf16() throws UnsupportedEncodingException {
        String charsetName = "UTF-16";
        testGetBytesUnchecked(charsetName);
        byte[] expected = STRING_FIXTURE.getBytes(charsetName);
        byte[] actual = StringUtils.getBytesUtf16(STRING_FIXTURE);
        Assert.assertTrue(Arrays.equals(expected, actual));
    }

    public void testGetBytesUtf16Be() throws UnsupportedEncodingException {
        String charsetName = "UTF-16BE";
        testGetBytesUnchecked(charsetName);
        byte[] expected = STRING_FIXTURE.getBytes(charsetName);
        byte[] actual = StringUtils.getBytesUtf16Be(STRING_FIXTURE);
        Assert.assertTrue(Arrays.equals(expected, actual));
    }

    public void testGetBytesUtf16Le() throws UnsupportedEncodingException {
        String charsetName = "UTF-16LE";
        testGetBytesUnchecked(charsetName);
        byte[] expected = STRING_FIXTURE.getBytes(charsetName);
        byte[] actual = StringUtils.getBytesUtf16Le(STRING_FIXTURE);
        Assert.assertTrue(Arrays.equals(expected, actual));
    }

    public void testGetBytesUtf8() throws UnsupportedEncodingException {
        String charsetName = "UTF-8";
        testGetBytesUnchecked(charsetName);
        byte[] expected = STRING_FIXTURE.getBytes(charsetName);
        byte[] actual = StringUtils.getBytesUtf8(STRING_FIXTURE);
        Assert.assertTrue(Arrays.equals(expected, actual));
    }

    public void testGetBytesUncheckedBadName() {
        try {
            StringUtils.getBytesUnchecked(STRING_FIXTURE, "UNKNOWN");
            Assert.fail("Expected " + IllegalStateException.class.getName());
        } catch (IllegalStateException e) {
            // Expected
        }
    }

    private void testNewString(String charsetName) throws UnsupportedEncodingException {
        String expected = new String(BYTES_FIXTURE, charsetName);
        String actual = StringUtils.newString(BYTES_FIXTURE, charsetName);
        Assert.assertEquals(expected, actual);
    }

    public void testNewStringBadEnc() {
        try {
            StringUtils.newString(BYTES_FIXTURE, "UNKNOWN");
            Assert.fail("Expected " + IllegalStateException.class.getName());
        } catch (IllegalStateException e) {
            // Expected
        }
    }

    public void testNewStringIso8859_1() throws UnsupportedEncodingException {
        String charsetName = "ISO-8859-1";
        testNewString(charsetName);
        String expected = new String(BYTES_FIXTURE, charsetName);
        String actual = StringUtils.newStringIso8859_1(BYTES_FIXTURE);
        Assert.assertEquals(expected, actual);
    }

    public void testNewStringUsAscii() throws UnsupportedEncodingException {
        String charsetName = "US-ASCII";
        testNewString(charsetName);
        String expected = new String(BYTES_FIXTURE, charsetName);
        String actual = StringUtils.newStringUsAscii(BYTES_FIXTURE);
        Assert.assertEquals(expected, actual);
    }

    public void testNewStringUtf16() throws UnsupportedEncodingException {
        String charsetName = "UTF-16";
        testNewString(charsetName);
        String expected = new String(BYTES_FIXTURE, charsetName);
        String actual = StringUtils.newStringUtf16(BYTES_FIXTURE);
        Assert.assertEquals(expected, actual);
    }

    public void testNewStringUtf16Be() throws UnsupportedEncodingException {
        String charsetName = "UTF-16BE";
        testNewString(charsetName);
        String expected = new String(BYTES_FIXTURE, charsetName);
        String actual = StringUtils.newStringUtf16Be(BYTES_FIXTURE);
        Assert.assertEquals(expected, actual);
    }

    public void testNewStringUtf16Le() throws UnsupportedEncodingException {
        String charsetName = "UTF-16LE";
        testNewString(charsetName);
        String expected = new String(BYTES_FIXTURE, charsetName);
        String actual = StringUtils.newStringUtf16Le(BYTES_FIXTURE);
        Assert.assertEquals(expected, actual);
    }

    public void testNewStringUtf8() throws UnsupportedEncodingException {
        String charsetName = "UTF-8";
        testNewString(charsetName);
        String expected = new String(BYTES_FIXTURE, charsetName);
        String actual = StringUtils.newStringUtf8(BYTES_FIXTURE);
        Assert.assertEquals(expected, actual);
    }
}

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