1 /*
2  * Copyright (C) 2007 The Guava Authors
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.google.common.base;
18 
19 import com.google.common.annotations.GwtCompatible;
20 import com.google.common.annotations.GwtIncompatible;
21 
22 import junit.framework.TestCase;
23 
24 import java.io.UnsupportedEncodingException;
25 import java.nio.charset.Charset;
26 import java.util.Arrays;
27 
28 /**
29  * Unit test for {@link Charsets}.
30  *
31  * @author Mike Bostock
32  */
33 @GwtCompatible(emulated = true)
34 public class CharsetsTest extends TestCase {
35 
36   @GwtIncompatible("Non-UTF-8 Charset")
testUsAscii()37   public void testUsAscii() {
38     assertEquals(Charset.forName("US-ASCII"), Charsets.US_ASCII);
39   }
40 
41   @GwtIncompatible("Non-UTF-8 Charset")
testIso88591()42   public void testIso88591() {
43     assertEquals(Charset.forName("ISO-8859-1"), Charsets.ISO_8859_1);
44   }
45 
testUtf8()46   public void testUtf8() {
47     assertEquals(Charset.forName("UTF-8"), Charsets.UTF_8);
48   }
49 
50   @GwtIncompatible("Non-UTF-8 Charset")
testUtf16be()51   public void testUtf16be() {
52     assertEquals(Charset.forName("UTF-16BE"), Charsets.UTF_16BE);
53   }
54 
55   @GwtIncompatible("Non-UTF-8 Charset")
testUtf16le()56   public void testUtf16le() {
57     assertEquals(Charset.forName("UTF-16LE"), Charsets.UTF_16LE);
58   }
59 
60   @GwtIncompatible("Non-UTF-8 Charset")
testUtf16()61   public void testUtf16() {
62     assertEquals(Charset.forName("UTF-16"), Charsets.UTF_16);
63   }
64 
65   @GwtIncompatible("Non-UTF-8 Charset")
testWhyUsAsciiIsDangerous()66   public void testWhyUsAsciiIsDangerous() throws UnsupportedEncodingException {
67     byte[] b1 = "朝日新聞".getBytes(Charsets.US_ASCII.name());
68     byte[] b2 = "聞朝日新".getBytes(Charsets.US_ASCII.name());
69     byte[] b3 = "????".getBytes(Charsets.US_ASCII.name());
70     byte[] b4 = "ニュース".getBytes(Charsets.US_ASCII.name());
71     byte[] b5 = "スューー".getBytes(Charsets.US_ASCII.name());
72     // Assert they are all equal (using the transitive property)
73     assertTrue(Arrays.equals(b1, b2));
74     assertTrue(Arrays.equals(b2, b3));
75     assertTrue(Arrays.equals(b3, b4));
76     assertTrue(Arrays.equals(b4, b5));
77   }
78 }
79