/*

 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

import java.io.Reader;

import java.io.IOException;

import java.io.StringWriter;

import java.nio.CharBuffer;

import java.nio.ReadOnlyBufferException;

import org.testng.annotations.AfterGroups;

import org.testng.annotations.BeforeGroups;

import org.testng.annotations.Test;

import static org.testng.Assert.*;

/*

 * @test

 * @run testng NullReader

 * @summary Check for expected behavior of Reader.nullReader().

 */

public class NullReader {

    private static Reader openReader;

    private static Reader closedReader;

    @BeforeGroups(groups = "open")

    public static void openStream() {

        openReader = Reader.nullReader();

    }

    @BeforeGroups(groups = "closed")

    public static void openAndCloseStream() throws IOException {

        closedReader = Reader.nullReader();

        closedReader.close();

    }

    @AfterGroups(groups = "open")

    public static void closeStream() throws IOException {

        openReader.close();

    }

    @Test(groups = "open")

    public static void testOpen() {

        assertNotNull(openReader, "Reader.nullReader() returned null");

    }

    @Test(groups = "open")

    public static void testRead() throws IOException {

        assertEquals(-1, openReader.read(), "read() != -1");

    }

    @Test(groups = "open")

    public static void testReadBII() throws IOException {

        assertEquals(-1, openReader.read(new char[1], 0, 1),

                "read(char[],int,int) != -1");

    }

    @Test(groups = "open")

    public static void testReadBIILenZero() throws IOException {

        assertEquals(0, openReader.read(new char[1], 0, 0),

                "read(char[],int,int) != 0");

    }

    @Test(groups = "open")

    public static void testReadCharBuffer() throws IOException {

        CharBuffer charBuffer = CharBuffer.allocate(1);

        assertEquals(-1, openReader.read(charBuffer),

                "read(CharBuffer) != -1");

    }

    @Test(groups = "open")

    public static void testReadCharBufferZeroRemaining() throws IOException {

        CharBuffer charBuffer = CharBuffer.allocate(0);

        assertEquals(0, openReader.read(charBuffer),

                "read(CharBuffer) != 0");

    }

    @Test(groups = "open")

    public static void testSkip() throws IOException {

        assertEquals(0, openReader.skip(1), "skip() != 0");

    }

    @Test(groups = "open")

    public static void testTransferTo() throws IOException {

        assertEquals(0, openReader.transferTo(new StringWriter(7)),

                "transferTo() != 0");

    }

    @Test(groups = "closed", expectedExceptions = IOException.class)

    public static void testReadClosed() throws IOException {

        closedReader.read();

    }

    @Test(groups = "closed", expectedExceptions = IOException.class)

    public static void testReadBIIClosed() throws IOException {

        closedReader.read(new char[1], 0, 1);

    }

    @Test(groups = "closed", expectedExceptions = IOException.class)

    public static void testReadCharBufferClosed() throws IOException {

        CharBuffer charBuffer = CharBuffer.allocate(0);

        closedReader.read(charBuffer);

    }

    @Test(groups = "closed", expectedExceptions = IOException.class)

    public static void testReadCharBufferZeroRemainingClosed() throws IOException {

        CharBuffer charBuffer = CharBuffer.allocate(0);

        closedReader.read(charBuffer);

    }

    @Test(groups = "closed", expectedExceptions = IOException.class)

    public static void testSkipClosed() throws IOException {

        closedReader.skip(1);

    }

    @Test(groups = "closed", expectedExceptions = IOException.class)

    public static void testTransferToClosed() throws IOException {

        closedReader.transferTo(new StringWriter(7));

    }

}