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.io;
18 
19 import java.io.ByteArrayOutputStream;
20 
21 /**
22  * Unit tests for {@link CountingOutputStream}.
23  *
24  * @author Chris Nokleberg
25  */
26 public class CountingOutputStreamTest extends IoTestCase {
27 
testCount()28   public void testCount() throws Exception {
29     int written = 0;
30     ByteArrayOutputStream out = new ByteArrayOutputStream();
31     CountingOutputStream counter = new CountingOutputStream(out);
32     assertEquals(written, out.size());
33     assertEquals(written, counter.getCount());
34 
35     counter.write(0);
36     written += 1;
37     assertEquals(written, out.size());
38     assertEquals(written, counter.getCount());
39 
40     byte[] data = new byte[10];
41     counter.write(data);
42     written += 10;
43     assertEquals(written, out.size());
44     assertEquals(written, counter.getCount());
45 
46     counter.write(data, 0, 5);
47     written += 5;
48     assertEquals(written, out.size());
49     assertEquals(written, counter.getCount());
50 
51     counter.write(data, 2, 5);
52     written += 5;
53     assertEquals(written, out.size());
54     assertEquals(written, counter.getCount());
55 
56     // Test that illegal arguments do not affect count
57     try {
58       counter.write(data, 0, data.length + 1);
59       fail("expected exception");
60     } catch (IndexOutOfBoundsException expected) {
61     }
62     assertEquals(written, out.size());
63     assertEquals(written, counter.getCount());
64   }
65 }
66