Add test case for RememberingInputStream.

diff --git a/src/test/java/net/pterodactylus/sonitus/io/RememberingInputStreamTest.java b/src/test/java/net/pterodactylus/sonitus/io/RememberingInputStreamTest.java
new file mode 100644 (file)
index 0000000..05104bb
--- /dev/null
+++ b/src/test/java/net/pterodactylus/sonitus/io/RememberingInputStreamTest.java
@@ -0,0 +1,88 @@
+/*
+ * Sonitus - RememberingInputStreamTest.java - Copyright © 2013 David Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sonitus.io;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Arrays;
+import java.util.Random;
+
+import com.google.common.io.ByteStreams;
+import org.testng.annotations.Test;
+
+/**
+ * Test case for {@link RememberingInputStream}.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class RememberingInputStreamTest {
+
+       /**
+        * Tests {@link RememberingInputStream#remembered()}.
+        *
+        * @throws IOException
+        *              if an I/O error occurs
+        */
+       @Test
+       public void test() throws IOException {
+               RememberingInputStream rememberingInputStream;
+               byte[] randomData = generateData(System.currentTimeMillis(), 1048576);
+               InputStream inputStream = new ByteArrayInputStream(randomData);
+               byte[] readBytes;
+
+               rememberingInputStream = new RememberingInputStream(inputStream);
+               readBytes = new byte[524288];
+               ByteStreams.readFully(rememberingInputStream, readBytes);
+               assertThat(readBytes, is(Arrays.copyOfRange(randomData, 0, 524288)));
+
+               rememberingInputStream = new RememberingInputStream(rememberingInputStream.remembered());
+               readBytes = new byte[131072];
+               ByteStreams.readFully(rememberingInputStream, readBytes);
+               assertThat(readBytes, is(Arrays.copyOfRange(randomData, 0, 131072)));
+
+               rememberingInputStream = new RememberingInputStream(rememberingInputStream.remembered());
+               readBytes = new byte[1048576];
+               ByteStreams.readFully(rememberingInputStream, readBytes);
+               assertThat(readBytes, is(Arrays.copyOfRange(randomData, 0, 1048576)));
+       }
+
+       //
+       // PRIVATE METHODS
+       //
+
+       /**
+        * Generates random data.
+        *
+        * @param seed
+        *              The seed for the random number generator
+        * @param length
+        *              The length of the data to generate
+        * @return The generated random data
+        */
+       private byte[] generateData(long seed, int length) {
+               Random random = new Random(seed);
+               byte[] buffer = new byte[length];
+               random.nextBytes(buffer);
+               return buffer;
+       }
+
+}