/*

 * Copyright (c) 2016, 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @bug 8131023 8167461

 * @summary Verify that the user's code can read System.in

 * @build KullaTesting TestingInputStream

 * @run testng UserInputTest

 */

import java.io.IOException;

import java.io.InputStream;

import org.testng.annotations.Test;

@Test

public class UserInputTest extends KullaTesting {

    public void testReadInput() {

        setInput("AB\n");

        assertEval("System.in.read()", "65");

        setInput("CD\n");

        assertEval("System.in.read()", "67");

    }

    public void testScanner() {

        assertEval("import java.util.Scanner;");

        assertEval("Scanner s = new Scanner(System.in);");

        setInput("12\n");

        assertEval("s.nextInt();", "12");

    }

    public void testClose() {

        setInput(new InputStream() {

            private final byte[] data = new byte[] {0, 1, 2};

            private int cursor;

            @Override public int read() throws IOException {

                if (cursor < data.length) {

                    return data[cursor++];

                } else {

                    return -1;

                }

            }

        });

        assertEval("int read;", "0");

        assertEval("System.in.read();", "0");

        assertEval("System.in.read();", "1");

        assertEval("System.in.read();", "2");

        assertEval("System.in.read();", "-1");

        assertEval("System.in.read();", "-1");

        assertEval("System.in.read();", "-1");

    }

    public void testException() {

        setInput(new InputStream() {

            private final int[] data = new int[] {0, 1, -2, 2};

            private int cursor;

            @Override public int read() throws IOException {

                if (cursor < data.length) {

                    int d = data[cursor++];

                    if (d == (-2)) {

                        throw new IOException("Crashed");

                    }

                    return d;

                } else {

                    return -1;

                }

            }

        });

        assertEval("int read;", "0");

        assertEval("System.in.read();", "0");

        assertEval("System.in.read();", "1");

        assertEval("java.io.IOException e;");

        assertEval("try { System.in.read(); } catch (java.io.IOException exc) { e = exc; }");

        assertEval("e", "java.io.IOException: Crashed");

        assertEval("System.in.read();", "2");

        assertEval("System.in.read();", "-1");

    }

}