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The DSI utilities are a mishmash of classes accumulated during the last twenty years in projects developed at the DSI (Dipartimento di Scienze dell'Informazione, i.e., Information Sciences Department), now DI (Dipartimento di Informatica, i.e., Informatics Department), of the Universita` degli Studi di Milano.

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package it.unimi.dsi.io;

/*
 * DSI utilities
 *
 * Copyright (C) 2010-2020 Sebastiano Vigna
 *
 *  This library is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU Lesser General Public License as published by the Free
 *  Software Foundation; either version 3 of the License, or (at your option)
 *  any later version.
 *
 *  This library 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 Lesser General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program; if not, see .
 *
 */

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import it.unimi.dsi.fastutil.io.FastBufferedOutputStream;
import it.unimi.dsi.lang.MutableString;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.StringReader;

import org.junit.Test;

@SuppressWarnings("resource")
public class FastBufferedReaderTest {

	@Test
	public void testToSpec() {
		String className = FastBufferedReader.class.getName();
		assertEquals(className, new FastBufferedReader().toSpec());
		assertEquals(className + "(100)", new FastBufferedReader(100).toSpec());
		assertEquals(className + "(\"_\")", new FastBufferedReader("_").toSpec());
		assertEquals(className + "(100,\"_\")", new FastBufferedReader("100", "_").toSpec());
	}

	@Test
	public void testBufferZero() throws IOException {
		String string = "test\ntest\n";
		FastBufferedReader fbr = new FastBufferedReader(1);
		fbr.setReader(new StringReader(string));
		assertEquals(new MutableString("test"), fbr.readLine(new MutableString()));
		assertEquals('t', fbr.read());
		assertEquals('e', fbr.read());
		assertEquals('s', fbr.read());
		assertEquals('t', fbr.read());
		assertEquals('\n', fbr.read());
	}

	@Test
	public void testRandom() throws IOException {
		File file = File.createTempFile(FastBufferedReaderTest.class.getSimpleName(), "tmp");
		String s;
		file.deleteOnExit();
		MutableString ms = new MutableString(), ms2;
		int l = (int)file.length();
		FastBufferedReader br = new FastBufferedReader(new FileReader(file), 2);
		BufferedReader test = new BufferedReader(new FileReader(file));
		int a1, a2, off, len, pos;
		java.util.Random r = new java.util.Random(0);

		// Create temp file
		FastBufferedOutputStream fos = new FastBufferedOutputStream(new FileOutputStream(file));
		for(int i = 1000000; i-- !=0;) {
			final int c = r.nextInt(100);
			if (c <= 1) {
				if (c == 0) fos.write('\r');
				fos.write('\n');
			}
			else fos.write(r.nextInt(95) + 32);
		}
		fos.close();

		char b1[] = new char[32768];
		char b2[] = new char[32768];

		for(int t = 1000000; t-- != 0;) {

			switch(r.nextInt(4)) {

			case 0:
				//System.err.println("read()");
				a1 = br.read();
				a2 = test.read();
				assertTrue("Buffered read() returned " + a1 + " instead of " + a2 ,  a1 == a2);
				if (a1 == -1) return;
				break;

			case 1:
				off = r.nextInt(b1.length);
				len = r.nextInt(b1.length - off + 1);
				a1 = br.read(b1, off, len);
				a2 = test.read(b2, off, len);
				//System.err.println("read(b, " + off + ", " + len + ")");

				assertTrue("Buffered read(b, " + off + ", " + len + ") returned " + a1 + " instead of " + a2 ,  a1 == a2);

				for(int i = off; i < off + len; i++) assertTrue("Buffered read(b, " + off + ", " + len + ") has a mismatch at position " + i ,  b1[i] == b2[i]);
				break;

			case 2:
				pos = r.nextInt(l/2 + 1);
				a1 = (int)br.skip(pos);
				a2 = (int)test.skip(pos);
				//System.err.println("skip(" + pos + ")");
				assertTrue("skip() returned " + a1 + " instead of " + a2 ,  a1 == a2);
				break;

			case 3:
				ms2 = br.readLine(ms);
				s = test.readLine();
				//System.err.println("readLine()");
				assertTrue("readLine() returned " + ms + " instead of " + s ,  s == null && ms2 == null || ms.equals(s));

			}

		}

		file.delete();

	}
}