package net.sourceforge.tuned;


import static org.junit.Assert.assertEquals;

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.nio.channels.Channels;
import java.nio.charset.Charset;

import org.junit.Test;


public class ByteBufferOutputStreamTest {
	
	@Test
	public void growBufferAsNeeded() throws Exception {
		// initial buffer size of 1, increase size by a factor of 2 if a bigger buffer is needed
		ByteBufferOutputStream buffer = new ByteBufferOutputStream(1, 1.0f);
		
		buffer.write("asdf".getBytes("utf-8"));
		
		// check content
		assertEquals("asdf", Charset.forName("utf-8").decode(buffer.getByteBuffer()).toString());
		
		// check capacity
		assertEquals(4, buffer.capacity());
	}
	

	@Test
	public void transferFrom() throws Exception {
		InputStream in = new ByteArrayInputStream("asdf".getBytes("utf-8"));
		
		ByteBufferOutputStream buffer = new ByteBufferOutputStream(4);
		
		int n = buffer.transferFrom(Channels.newChannel(in));
		
		// check number of bytes transfered
		assertEquals(4, n);
		
		// check content
		assertEquals("asdf", Charset.forName("utf-8").decode(buffer.getByteBuffer()).toString());
	}
	
}