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
17package com.google.common.io;
18
19import java.io.ByteArrayOutputStream;
20
21/**
22 * Unit tests for {@link CountingOutputStream}.
23 *
24 * @author Chris Nokleberg
25 */
26public class CountingOutputStreamTest extends IoTestCase {
27
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