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

   1 /*
   2  * Sonitus - RememberingInputStreamTest.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
  23 import java.io.ByteArrayInputStream;
  24 import java.io.IOException;
  25 import java.io.InputStream;
  26 import java.util.Arrays;
  27 import java.util.Random;
  28
  29 import com.google.common.io.ByteStreams;
  30 import org.testng.annotations.Test;
  31
  32 /**
  33  * Test case for {@link RememberingInputStream}.
  34  *
  35  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  36  */
  37 public class RememberingInputStreamTest {
  38
  39         /**
  40          * Tests {@link RememberingInputStream#remembered()}.
  41          *
  42          * @throws IOException
  43          *              if an I/O error occurs
  44          */
  45         @Test
  46         public void test() throws IOException {
  47                 RememberingInputStream rememberingInputStream;
  48                 byte[] randomData = generateData(System.currentTimeMillis(), 1048576);
  49                 InputStream inputStream = new ByteArrayInputStream(randomData);
  50                 byte[] readBytes;
  51
  52                 rememberingInputStream = new RememberingInputStream(inputStream);
  53                 readBytes = new byte[524288];
  54                 ByteStreams.readFully(rememberingInputStream, readBytes);
  55                 assertThat(readBytes, is(Arrays.copyOfRange(randomData, 0, 524288)));
  56
  57                 rememberingInputStream = new RememberingInputStream(rememberingInputStream.remembered());
  58                 readBytes = new byte[131072];
  59                 ByteStreams.readFully(rememberingInputStream, readBytes);
  60                 assertThat(readBytes, is(Arrays.copyOfRange(randomData, 0, 131072)));
  61
  62                 rememberingInputStream = new RememberingInputStream(rememberingInputStream.remembered());
  63                 readBytes = new byte[1048576];
  64                 ByteStreams.readFully(rememberingInputStream, readBytes);
  65                 assertThat(readBytes, is(Arrays.copyOfRange(randomData, 0, 1048576)));
  66         }
  67
  68         //
  69         // PRIVATE METHODS
  70         //
  71
  72         /**
  73          * Generates random data.
  74          *
  75          * @param seed
  76          *              The seed for the random number generator
  77          * @param length
  78          *              The length of the data to generate
  79          * @return The generated random data
  80          */
  81         private byte[] generateData(long seed, int length) {
  82                 Random random = new Random(seed);
  83                 byte[] buffer = new byte[length];
  84                 random.nextBytes(buffer);
  85                 return buffer;
  86         }
  87
  88 }