/*
    * Copyright (C) 2007 The Guava Authors
    *
    * Licensed 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 com.google.common.base;
  
  import com.google.common.annotations.GwtCompatible;
  import com.google.common.annotations.GwtIncompatible;
  
  import junit.framework.TestCase;
  
  import java.nio.charset.Charset;
  import java.util.Arrays;
  
  /**
   * Unit test for {@link Charsets}.
   *
   * @author Mike Bostock
   */
  @GwtCompatible(emulated = true)
  public class CharsetsTest extends TestCase {
  
    @GwtIncompatible("Non-UTF-8 Charset")
    public void testUsAscii() {
      assertEquals(Charset.forName("US-ASCII"), Charsets.US_ASCII);
    }
  
    @GwtIncompatible("Non-UTF-8 Charset")
    public void testIso88591() {
      assertEquals(Charset.forName("ISO-8859-1"), Charsets.ISO_8859_1);
    }
  
    public void testUtf8() {
      assertEquals(Charset.forName("UTF-8"), Charsets.UTF_8);
    }
  
    @GwtIncompatible("Non-UTF-8 Charset")
    public void testUtf16be() {
      assertEquals(Charset.forName("UTF-16BE"), Charsets.UTF_16BE);
    }
  
    @GwtIncompatible("Non-UTF-8 Charset")
    public void testUtf16le() {
      assertEquals(Charset.forName("UTF-16LE"), Charsets.UTF_16LE);
    }
  
    @GwtIncompatible("Non-UTF-8 Charset")
    public void testUtf16() {
      assertEquals(Charset.forName("UTF-16"), Charsets.UTF_16);
    }
  
    @GwtIncompatible("Non-UTF-8 Charset")
    public void testWhyUsAsciiIsDangerous() {
      byte[] b1 = "朝日新聞".getBytes(Charsets.US_ASCII);
      byte[] b2 = "聞朝日新".getBytes(Charsets.US_ASCII);
      byte[] b3 = "????".getBytes(Charsets.US_ASCII);
      byte[] b4 = "ニュース".getBytes(Charsets.US_ASCII);
      byte[] b5 = "スューー".getBytes(Charsets.US_ASCII);
      // Assert they are all equal (using the transitive property)
      assertTrue(Arrays.equals(b1, b2));
      assertTrue(Arrays.equals(b2, b3));
      assertTrue(Arrays.equals(b3, b4));
      assertTrue(Arrays.equals(b4, b5));
    }
  }