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Java example source code file (CharEncodingTest.java)

This example Java source code file (CharEncodingTest.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

ascii, charencodingtest, doesnotexist, java, string, test, utf-8, utf8

The CharEncodingTest.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.lang3;

import static org.apache.commons.lang3.JavaVersion.JAVA_1_1;
import static org.apache.commons.lang3.JavaVersion.JAVA_1_2;
import static org.apache.commons.lang3.JavaVersion.JAVA_1_3;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

import org.junit.Test;

/**
 * Tests CharEncoding.
 * 
 * @see CharEncoding
 */
public class CharEncodingTest  {

    private void assertSupportedEncoding(final String name) {
        assertTrue("Encoding should be supported: " + name, CharEncoding.isSupported(name));
    }

    /**
     * The class can be instantiated.
     */
    @Test
    public void testConstructor() {
        new CharEncoding();
    }

    @Test
    public void testMustBeSupportedJava1_3_1() {
        if (SystemUtils.isJavaVersionAtLeast(JAVA_1_3)) {
            this.assertSupportedEncoding(CharEncoding.ISO_8859_1);
            this.assertSupportedEncoding(CharEncoding.US_ASCII);
            this.assertSupportedEncoding(CharEncoding.UTF_16);
            this.assertSupportedEncoding(CharEncoding.UTF_16BE);
            this.assertSupportedEncoding(CharEncoding.UTF_16LE);
            this.assertSupportedEncoding(CharEncoding.UTF_8);
        } else {
            this.warn("Java 1.3 tests not run since the current version is " + SystemUtils.JAVA_SPECIFICATION_VERSION);
        }
    }

    @Test
    public void testSupported() {
        assertTrue(CharEncoding.isSupported("UTF8"));
        assertTrue(CharEncoding.isSupported("UTF-8"));
        assertTrue(CharEncoding.isSupported("ASCII"));
    }

    @Test
    public void testNotSupported() {
        assertFalse(CharEncoding.isSupported(null));
        assertFalse(CharEncoding.isSupported(""));
        assertFalse(CharEncoding.isSupported(" "));
        assertFalse(CharEncoding.isSupported("\t\r\n"));
        assertFalse(CharEncoding.isSupported("DOESNOTEXIST"));
        assertFalse(CharEncoding.isSupported("this is not a valid encoding name"));
    }

    @Test
    public void testWorksOnJava1_1_8() {
        //
        // In this test, I simply deleted the encodings from the 1.3.1 list.
        // The Javadoc do not specify which encodings are required.
        //
        if (SystemUtils.isJavaVersionAtLeast(JAVA_1_1)) {
            this.assertSupportedEncoding(CharEncoding.ISO_8859_1);
            this.assertSupportedEncoding(CharEncoding.US_ASCII);
            this.assertSupportedEncoding(CharEncoding.UTF_8);
        } else {
            this.warn("Java 1.1 tests not run since the current version is " + SystemUtils.JAVA_SPECIFICATION_VERSION);
        }
    }

    @Test
    public void testWorksOnJava1_2_2() {
        //
        // In this test, I simply deleted the encodings from the 1.3.1 list.
        // The Javadoc do not specify which encodings are required.
        //
        if (SystemUtils.isJavaVersionAtLeast(JAVA_1_2)) {
            this.assertSupportedEncoding(CharEncoding.ISO_8859_1);
            this.assertSupportedEncoding(CharEncoding.US_ASCII);
            this.assertSupportedEncoding(CharEncoding.UTF_8);
        } else {
            this.warn("Java 1.2 tests not run since the current version is " + SystemUtils.JAVA_SPECIFICATION_VERSION);
        }
    }

    void warn(final String msg) {
        System.err.println(msg);
    }
}

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