libcore/nio_char/src/test/java/org/apache/harmony/nio_char/tests/java/nio/charset/CharsetTest.java

/* 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.harmony.nio_char.tests.java.nio.charset;

import dalvik.annotation.TestLevel;
import dalvik.annotation.TestTargetClass;
import dalvik.annotation.TestTargetNew;
import junit.framework.TestCase;
import tests.util.TestEnvironment;

import java.nio.charset.Charset;
import java.nio.charset.IllegalCharsetNameException;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Properties;
import java.util.Set;
@TestTargetClass(Charset.class)
public class CharsetTest extends TestCase {

    // Will contain names of charsets registered with IANA
    Set knownRegisteredCharsets = new HashSet();

    // Will contain names of charsets not known to be registered with IANA
    Set unknownRegisteredCharsets = new HashSet();

    /**
     * JUnit set-up method
     */
    public void setUp() {
        TestEnvironment.reset();

        // Populate the known charset vars
        Set names = Charset.availableCharsets().keySet();
        for (Iterator nameItr = names.iterator(); nameItr.hasNext();) {
            String name = (String) nameItr.next();
            if (name.toLowerCase().startsWith("x-"))
                unknownRegisteredCharsets.add(name);
            else
                knownRegisteredCharsets.add(name);
        }
    }

    /**
     * @tests java.nio.charset.Charset#isRegistered()
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "isRegistered",
        args = {}
    )
    public void test_isRegistered() {
        // Regression for HARMONY-45
        for (Iterator nameItr = knownRegisteredCharsets.iterator(); nameItr.hasNext();) {
            String name = (String) nameItr.next();
            assertTrue("Assert 0: isRegistered() failed for " + name,
                    Charset.forName(name).isRegistered());
        }
        for (Iterator nameItr = unknownRegisteredCharsets.iterator(); nameItr.hasNext();) {
            String name = (String) nameItr.next();
            assertFalse("Assert 0: isRegistered() failed for " + name,
                    Charset.forName(name).isRegistered());
        }
    }
    
    /**
     * @tests java.nio.charset.Charset#isSupported(String)
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "Checks IllegalCharsetNameException",
        method = "isSupported",
        args = {java.lang.String.class}
    )
    public void testIsSupported_EmptyString() {
        // Regression for HARMONY-113
        try {
            Charset.isSupported("");
            fail("Assert 0: Should throw IllegalCharsetNameException");
        } catch (IllegalCharsetNameException e) {
            // Expected
        }
    }
    
    /**
     * @tests java.nio.charset.Charset#defaultCharset()
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "defaultCharset",
        args = {}
    )
    public void test_defaultCharset() {
        String charsetName = null;
        String defaultCharsetName = null;
        String oldDefaultEncoding = System.getProperty("file.encoding");
        try {
            // Normal behavior
            charsetName = "UTF-8"; //$NON-NLS-1$
            System.setProperty("file.encoding", charsetName);//$NON-NLS-1$
            defaultCharsetName = Charset.defaultCharset().name();
            assertEquals(charsetName, defaultCharsetName);

            charsetName = "ISO-8859-1"; //$NON-NLS-1$
            System.setProperty("file.encoding", charsetName);//$NON-NLS-1$
            defaultCharsetName = Charset.defaultCharset().name();
            assertEquals(charsetName, defaultCharsetName);

            // Unsupported behavior
            charsetName = "IMPOSSIBLE-8"; //$NON-NLS-1$
            System.setProperty("file.encoding", charsetName);//$NON-NLS-1$
            defaultCharsetName = Charset.defaultCharset().name();
            assertEquals("UTF-8", defaultCharsetName);

            // Null behavior
            try {
                Properties currentProps = System.getProperties();
                currentProps.remove("file.encoding");//$NON-NLS-1$
                Charset.defaultCharset().name();
                fail("Should throw illegal IllegalArgumentException");//$NON-NLS-1$
            } catch (IllegalArgumentException e) {
                // expected
            }

            // IllegalCharsetName behavior
            try {
                charsetName = "IMP~~OSSIBLE-8"; //$NON-NLS-1$
                System.setProperty("file.encoding", charsetName);//$NON-NLS-1$
                Charset.defaultCharset().name();
                fail("Should throw IllegalCharsetNameException");//$NON-NLS-1$
            } catch (IllegalCharsetNameException e) {
                // expected
            }
        } finally {
            System.setProperty("file.encoding", oldDefaultEncoding);//$NON-NLS-1$
        }
    }
    
    /**
     * @tests java.nio.charset.Charset#forName(java.lang.String)
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL,
        notes = "Exceptions checking missed.",
        method = "forName",
        args = {java.lang.String.class}
    )
    public void test_forNameLjava_lang_String() {
        /*
         * invoke forName two times with the same canonical name, it
         * should return the same reference.
         */
        Charset cs1 = Charset.forName("UTF-8");
        Charset cs2 = Charset.forName("UTF-8");
        assertSame(cs1, cs2);

        /*
         * test forName: invoke forName two times for the same Charset using
         * canonical name and alias, it should return the same reference.
         */
        Charset cs3 = Charset.forName("ASCII");
        Charset cs4 = Charset.forName("US-ASCII");
        assertSame(cs3, cs4);
    }
}