/*
    * Copyright (C) 2009-2010, Google Inc. and others
    *
    * This program and the accompanying materials are made available under the
    * terms of the Eclipse Distribution License v. 1.0 which is available at
    * https://www.eclipse.org/org/documents/edl-v10.php.
    *
    * SPDX-License-Identifier: BSD-3-Clause
    */
  
  package org.eclipse.jgit.transport;
  
  import static java.nio.charset.StandardCharsets.UTF_8;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.fail;
  
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.OutputStream;
  
  import org.junit.Before;
  import org.junit.Test;
  
  // Note, test vectors created with:
  //
  // perl -e 'printf "%4.4x%s\n", 4+length($ARGV[0]),$ARGV[0]'
  
  public class PacketLineOutTest {
  	private ByteArrayOutputStream rawOut;
  
  	private PacketLineOut out;
  
  	@Before
  	public void setUp() throws Exception {
  		rawOut = new ByteArrayOutputStream();
  		out = new PacketLineOut(rawOut);
  	}
  
  	// writeString
  
  	@Test
  	public void testWriteString1() throws IOException {
  		out.writeString("a");
  		out.writeString("bc");
  		assertBuffer("0005a0006bc");
  	}
  
  	@Test
  	public void testWriteString2() throws IOException {
  		out.writeString("a\n");
  		out.writeString("bc\n");
  		assertBuffer("0006a\n0007bc\n");
  	}
  
  	@Test
  	public void testWriteString3() throws IOException {
  		out.writeString("");
  		assertBuffer("0004");
  	}
  
  	// end
  
  	@Test
  	public void testWriteEnd() throws IOException {
  		final int[] flushCnt = new int[1];
  		final OutputStream mockout = new OutputStream() {
  			@Override
  			public void write(int arg0) throws IOException {
  				rawOut.write(arg0);
  			}
  
  			@Override
  			public void flush() throws IOException {
  				flushCnt[0]++;
  			}
  		};
  
  		new PacketLineOut(mockout).end();
  		assertBuffer("0000");
  		assertEquals(1, flushCnt[0]);
  	}
  
  	@Test
  	public void testWriteDelim() throws IOException {
  		out.writeDelim();
  		assertBuffer("0001");
  	}
  
  	// writePacket
  
  	@Test
  	public void testWritePacket1() throws IOException {
  		out.writePacket(new byte[] { 'a' });
  		assertBuffer("0005a");
  	}
  
  	@Test
  	public void testWritePacket2() throws IOException {
  		out.writePacket(new byte[] { 'a', 'b', 'c', 'd' });
 		assertBuffer("0008abcd");
 	}
 
 	@Test
 	public void testWritePacket3() throws IOException {
 		final int buflen = SideBandOutputStream.MAX_BUF - 5;
 		final byte[] buf = new byte[buflen];
 		for (int i = 0; i < buf.length; i++) {
 			buf[i] = (byte) i;
 		}
 		out.writePacket(buf);
 		out.flush();
 
 		final byte[] act = rawOut.toByteArray();
 		final String explen = Integer.toString(buf.length + 4, 16);
 		assertEquals(4 + buf.length, act.length);
 		assertEquals(new String(act, 0, 4, "UTF-8"), explen);
 		for (int i = 0, j = 4; i < buf.length; i++, j++) {
 			assertEquals(buf[i], act[j]);
 		}
 	}
 
 	// flush
 
 	@Test
 	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 PacketLineOut(mockout).flush();
 		assertEquals(1, flushCnt[0]);
 	}
 
 	private void assertBuffer(String exp) {
 		assertEquals(exp, new String(rawOut.toByteArray(),
 				UTF_8));
 	}
 }