| // Copyright 2016 Google Inc. All rights reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package com.google.archivepatcher.shared; |
| |
| import org.junit.Assert; |
| import org.junit.Before; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.JUnit4; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| /** |
| * Tests for {@link CountingOutputStream}. |
| */ |
| @RunWith(JUnit4.class) |
| @SuppressWarnings("javadoc") |
| public class CountingOutputStreamTest { |
| private ByteArrayOutputStream outBuffer; |
| private CountingOutputStream stream; |
| |
| /** |
| * Helper class that discards all output. |
| */ |
| private static class NullStream extends OutputStream { |
| @Override |
| public void write(int b) throws IOException { |
| // Do nothing |
| } |
| |
| @Override |
| public void write(byte[] b) throws IOException { |
| // Do nothing |
| } |
| |
| @Override |
| public void write(byte[] b, int off, int len) throws IOException { |
| // Do nothing |
| } |
| } |
| |
| @Before |
| public void setup() { |
| outBuffer = new ByteArrayOutputStream(); |
| stream = new CountingOutputStream(outBuffer); |
| } |
| |
| @Test |
| public void testGetNumBytesWritten_Zero() { |
| Assert.assertEquals(0, stream.getNumBytesWritten()); |
| } |
| |
| @Test |
| public void testGetNumBytesWritten_FewBytes() throws IOException { |
| stream.write(1); |
| Assert.assertEquals(1, stream.getNumBytesWritten()); |
| stream.write(new byte[] {2, 3, 4}); |
| Assert.assertEquals(4, stream.getNumBytesWritten()); |
| stream.write(new byte[] {4, 5, 6, 7, 8}, 1, 3); // Write only {5, 6, 7} |
| Assert.assertEquals(7, stream.getNumBytesWritten()); |
| byte[] expected = new byte[] {1, 2, 3, 4, 5, 6, 7}; |
| Assert.assertArrayEquals(expected, outBuffer.toByteArray()); |
| } |
| |
| @Test |
| public void testGetNumBytesWritten_PastIntegerMaxValue() throws IOException { |
| // Make a 1MB buffer. Iterating over this 2048 times will take the test to the 2GB limit of |
| // Integer.maxValue. Use a NullStream to avoid excessive memory usage and make the test fast. |
| stream = new CountingOutputStream(new NullStream()); |
| byte[] buffer = new byte[1024 * 1024]; |
| for (int x = 0; x < 2048; x++) { |
| stream.write(buffer); |
| } |
| long expected = 2048L * 1024L * 1024L; // == 2GB, Integer.MAX_VALUE + 1 |
| Assert.assertTrue(expected > Integer.MAX_VALUE); |
| Assert.assertEquals(expected, stream.getNumBytesWritten()); |
| // Push it well past 4GB |
| for (int x = 0; x < 78053; x++) { |
| stream.write(buffer); |
| expected += buffer.length; |
| Assert.assertEquals(expected, stream.getNumBytesWritten()); |
| } |
| } |
| } |