src/test/java/net/pterodactylus/sonitus/io/IntegralWriteOutputStreamTest.java

   1 /*
   2  * Sonitus - IntegralWriteOutputStreamTest.java - Copyright © 2013 David Roden
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.pterodactylus.sonitus.io;
  19
  20 import static org.hamcrest.CoreMatchers.is;
  21 import static org.junit.Assert.assertThat;
  22 import static org.mockito.Matchers.any;
  23 import static org.mockito.Matchers.anyInt;
  24 import static org.mockito.Mockito.mock;
  25 import static org.mockito.Mockito.never;
  26 import static org.mockito.Mockito.times;
  27 import static org.mockito.Mockito.verify;
  28
  29 import java.io.ByteArrayOutputStream;
  30 import java.io.IOException;
  31 import java.io.OutputStream;
  32 import java.util.Random;
  33
  34 import org.testng.annotations.Test;
  35
  36 /**
  37  * Unit tests for {@link IntegralWriteOutputStream}.
  38  *
  39  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  40  */
  41 public class IntegralWriteOutputStreamTest {
  42
  43         @Test
  44         public void testSingleWritesWithSize2() throws IOException {
  45                 OutputStream outputStream = mock(OutputStream.class);
  46
  47                 IntegralWriteOutputStream integralWriteOutputStream = new IntegralWriteOutputStream(outputStream, 2);
  48                 integralWriteOutputStream.write(1);
  49                 integralWriteOutputStream.write(2);
  50                 integralWriteOutputStream.write(3);
  51                 integralWriteOutputStream.write(4);
  52                 integralWriteOutputStream.write(5);
  53
  54                 verify(outputStream, never()).write(anyInt());
  55                 verify(outputStream, times(2)).write((byte[]) any());
  56         }
  57
  58         @Test
  59         public void testLargeWritesWithSize3() throws IOException {
  60                 ByteArrayOutputStream byteArrayOutputStream = getOutputStream(3);
  61                 IntegralWriteOutputStream integralWriteOutputStream = new IntegralWriteOutputStream(byteArrayOutputStream, 3);
  62
  63                 byte[] buffer = generateData(18);
  64                 integralWriteOutputStream.write(buffer, 0, 7);
  65                 integralWriteOutputStream.write(buffer, 7, 7);
  66                 integralWriteOutputStream.write(buffer, 14, 4);
  67
  68                 assertThat(byteArrayOutputStream.toByteArray(), is(buffer));
  69         }
  70
  71         @Test
  72         public void testLargeWritesWithSize4() throws IOException {
  73                 ByteArrayOutputStream byteArrayOutputStream = getOutputStream(1024);
  74                 IntegralWriteOutputStream integralWriteOutputStream = new IntegralWriteOutputStream(byteArrayOutputStream, 1024);
  75
  76                 byte[] buffer = generateData(32768);
  77                 integralWriteOutputStream.write(buffer, 0, 123);
  78                 integralWriteOutputStream.write(buffer, 123, 768);
  79                 integralWriteOutputStream.write(buffer, 123 + 768, 6285);
  80                 integralWriteOutputStream.write(buffer, 123 + 768 + 6285, 1234);
  81                 integralWriteOutputStream.write(buffer, 123 + 768 + 6285 + 1234, 21111);
  82                 integralWriteOutputStream.write(buffer, 123 + 768 + 6285 + 1234 + 21111, 32768 - (123 + 768 + 6285 + 1234 + 21111));
  83
  84                 assertThat(byteArrayOutputStream.toByteArray(), is(buffer));
  85         }
  86
  87         //
  88         // PRIVATE METHODS
  89         //
  90
  91         /**
  92          * Creates a {@link ByteArrayOutputStream} that will throw an {@link
  93          * IllegalArgumentException} if its {@link OutputStream#write(byte[], int,
  94          * int)} method is called with {@code len} not being a multiple of {@code
  95          * integralSize}, or if {@link OutputStream#write(int)} is called.
  96          *
  97          * @param integralSize
  98          *              The number of bytes to write multiples of
  99          * @return The created output stream
 100          */
 101         private static ByteArrayOutputStream getOutputStream(final int integralSize) {
 102                 return new ByteArrayOutputStream() {
 103
 104                         @Override
 105                         public synchronized void write(byte[] b, int off, int len) {
 106                                 if ((len % integralSize) != 0) {
 107                                         throw new IllegalArgumentException(String.format("%d is not a multiple of %d.", len, integralSize));
 108                                 }
 109                                 super.write(b, off, len);
 110                         }
 111
 112                         @Override
 113                         public synchronized void write(int b) {
 114                                 throw new IllegalArgumentException("write(int) called.");
 115                         }
 116
 117                 };
 118         }
 119
 120         /**
 121          * Generates a random amount of data.
 122          *
 123          * @param length
 124          *              The length of the data
 125          * @return The generated random data
 126          */
 127         private static byte[] generateData(int length) {
 128                 Random random = new Random();
 129                 byte[] buffer = new byte[length];
 130                 random.nextBytes(buffer);
 131                 return buffer;
 132         }
 133
 134 }