jgit/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/SideBandOutputStreamTest.java

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package org.eclipse.jgit.transport;

import static org.eclipse.jgit.transport.SideBandOutputStream.CH_DATA;
import static org.eclipse.jgit.transport.SideBandOutputStream.CH_ERROR;
import static org.eclipse.jgit.transport.SideBandOutputStream.CH_PROGRESS;
import static org.eclipse.jgit.transport.SideBandOutputStream.HDR_SIZE;
import static org.eclipse.jgit.transport.SideBandOutputStream.MAX_BUF;
import static org.eclipse.jgit.transport.SideBandOutputStream.SMALL_BUF;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import junit.framework.TestCase;

import org.eclipse.jgit.lib.Constants;

// Note, test vectors created with:
//
// perl -e 'printf "%4.4x%s\n", 4+length($ARGV[0]),$ARGV[0]'

public class SideBandOutputStreamTest extends TestCase {
	private ByteArrayOutputStream rawOut;

	protected void setUp() throws Exception {
		super.setUp();
		rawOut = new ByteArrayOutputStream();
	}

	public void testWrite_CH_DATA() throws IOException {
		final SideBandOutputStream out;
		out = new SideBandOutputStream(CH_DATA, SMALL_BUF, rawOut);
		out.write(new byte[] { 'a', 'b', 'c' });
		out.flush();
		assertBuffer("0008\001abc");
	}

	public void testWrite_CH_PROGRESS() throws IOException {
		final SideBandOutputStream out;
		out = new SideBandOutputStream(CH_PROGRESS, SMALL_BUF, rawOut);
		out.write(new byte[] { 'a', 'b', 'c' });
		out.flush();
		assertBuffer("0008\002abc");
	}

	public void testWrite_CH_ERROR() throws IOException {
		final SideBandOutputStream out;
		out = new SideBandOutputStream(CH_ERROR, SMALL_BUF, rawOut);
		out.write(new byte[] { 'a', 'b', 'c' });
		out.flush();
		assertBuffer("0008\003abc");
	}

	public void testWrite_Small() throws IOException {
		final SideBandOutputStream out;
		out = new SideBandOutputStream(CH_DATA, SMALL_BUF, rawOut);
		out.write('a');
		out.write('b');
		out.write('c');
		out.flush();
		assertBuffer("0008\001abc");
	}

	public void testWrite_SmallBlocks1() throws IOException {
		final SideBandOutputStream out;
		out = new SideBandOutputStream(CH_DATA, 6, rawOut);
		out.write('a');
		out.write('b');
		out.write('c');
		out.flush();
		assertBuffer("0006\001a0006\001b0006\001c");
	}

	public void testWrite_SmallBlocks2() throws IOException {
		final SideBandOutputStream out;
		out = new SideBandOutputStream(CH_DATA, 6, rawOut);
		out.write(new byte[] { 'a', 'b', 'c' });
		out.flush();
		assertBuffer("0006\001a0006\001b0006\001c");
	}

	public void testWrite_SmallBlocks3() throws IOException {
		final SideBandOutputStream out;
		out = new SideBandOutputStream(CH_DATA, 7, rawOut);
		out.write('a');
		out.write(new byte[] { 'b', 'c' });
		out.flush();
		assertBuffer("0007\001ab0006\001c");
	}

	public void testWrite_Large() throws IOException {
		final int buflen = MAX_BUF - HDR_SIZE;
		final byte[] buf = new byte[buflen];
		for (int i = 0; i < buf.length; i++) {
			buf[i] = (byte) i;
		}

		final SideBandOutputStream out;
		out = new SideBandOutputStream(CH_DATA, MAX_BUF, rawOut);
		out.write(buf);
		out.flush();

		final byte[] act = rawOut.toByteArray();
		final String explen = Integer.toString(buf.length + HDR_SIZE, 16);
		assertEquals(HDR_SIZE + buf.length, act.length);
		assertEquals(new String(act, 0, 4, "UTF-8"), explen);
		assertEquals(1, act[4]);
		for (int i = 0, j = HDR_SIZE; i < buf.length; i++, j++) {
			assertEquals(buf[i], act[j]);
		}
	}

	public void testFlush() throws IOException {
		final int[] flushCnt = new int[1];
		final OutputStream mockout = new OutputStream() {
			@Override
			public void write(int arg0) throws IOException {
				fail("should not write");
			}

			@Override
			public void flush() throws IOException {
				flushCnt[0]++;
			}
		};

		new SideBandOutputStream(CH_DATA, SMALL_BUF, mockout).flush();
		assertEquals(1, flushCnt[0]);
	}

	public void testConstructor_RejectsBadChannel() {
		try {
			new SideBandOutputStream(-1, MAX_BUF, rawOut);
			fail("Accepted -1 channel number");
		} catch (IllegalArgumentException e) {
			assertEquals("channel -1 must be in range [0, 255]", e.getMessage());
		}

		try {
			new SideBandOutputStream(0, MAX_BUF, rawOut);
			fail("Accepted 0 channel number");
		} catch (IllegalArgumentException e) {
			assertEquals("channel 0 must be in range [0, 255]", e.getMessage());
		}

		try {
			new SideBandOutputStream(256, MAX_BUF, rawOut);
			fail("Accepted 256 channel number");
		} catch (IllegalArgumentException e) {
			assertEquals("channel 256 must be in range [0, 255]", e
					.getMessage());
		}
	}

	public void testConstructor_RejectsBadBufferSize() {
		try {
			new SideBandOutputStream(CH_DATA, -1, rawOut);
			fail("Accepted -1 for buffer size");
		} catch (IllegalArgumentException e) {
			assertEquals("packet size -1 must be >= 5", e.getMessage());
		}

		try {
			new SideBandOutputStream(CH_DATA, 0, rawOut);
			fail("Accepted 0 for buffer size");
		} catch (IllegalArgumentException e) {
			assertEquals("packet size 0 must be >= 5", e.getMessage());
		}

		try {
			new SideBandOutputStream(CH_DATA, 1, rawOut);
			fail("Accepted 1 for buffer size");
		} catch (IllegalArgumentException e) {
			assertEquals("packet size 1 must be >= 5", e.getMessage());
		}

		try {
			new SideBandOutputStream(CH_DATA, Integer.MAX_VALUE, rawOut);
			fail("Accepted " + Integer.MAX_VALUE + " for buffer size");
		} catch (IllegalArgumentException e) {
			assertEquals("packet size " + Integer.MAX_VALUE
					+ " must be <= 65520", e.getMessage());
		}
	}

	private void assertBuffer(final String exp) throws IOException {
		assertEquals(exp, new String(rawOut.toByteArray(),
				Constants.CHARACTER_ENCODING));
	}
}