harmony-tests/src/test/java/tests/api/java/nio/charset/UTFCharsetEncoderTest.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 tests.api.java.nio.charset;

import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;

/**
 * test case specific activity of utf-8 charset encoder
 */
public class UTFCharsetEncoderTest extends CharsetEncoderTest {

	// charset for UTF-8
	private static final Charset CS = Charset.forName("utf-8");

	/*
	 * @see CharsetEncoderTest#setUp()
	 */
	protected void setUp() throws Exception {
		cs = CS;
		specifiedReplacement = new byte[] { 63 };
		super.setUp();
	}

	/*
	 * @see CharsetEncoderTest#tearDown()
	 */
	protected void tearDown() throws Exception {
		super.tearDown();
	}

	public void testCanEncodechar() throws CharacterCodingException {
		// normal case for utfCS
		assertTrue(encoder.canEncode('\u0077'));
		assertTrue(encoder.canEncode('\uc2a3'));

		// for non-mapped char
		assertTrue(encoder.canEncode('\uc2c0'));
	}

	public void testCanEncodeCharSequence() {
		// normal case for utfCS
		assertTrue(encoder.canEncode("\u0077"));
		assertTrue(encoder.canEncode("\uc2a3"));
		assertTrue(encoder.canEncode(""));

		// for non-mapped char
		assertTrue(encoder.canEncode("\uc2c0"));

		// surrogate char for unicode
		// 1st byte: d800-dbff
		// 2nd byte: dc00-dfff
		// valid surrogate pair
		assertTrue(encoder.canEncode("\ud800\udc00"));
		// invalid surrogate pair
		assertFalse(encoder.canEncode("\ud800\udb00"));
	}

	public void testCanEncodeICUBug() {
		assertFalse(encoder.canEncode("\ud800"));
	}

	public void testSpecificDefaultValue() {
		assertEquals(1.1, encoder.averageBytesPerChar(), 0.0001);
		// assertEquals(2, encoder.averageBytesPerChar(), 0.0001);
		assertEquals(4, encoder.maxBytesPerChar(), 0);
		// assertEquals(3, encoder.maxBytesPerChar(), 0);
	}

	CharBuffer getMalformedCharBuffer() {
		return CharBuffer.wrap("\ud800 buffer");
	}

	CharBuffer getUnmapCharBuffer() {
		return null;
	}

	CharBuffer getExceptionCharBuffer() {
		return null;
	}

	protected byte[] getIllegalByteArray() {
		return new byte[] { (byte) 0xd8, (byte) 0x00 };
	}

	protected void assertFlushed() {
	}
}