/*
 * Copyright (c) 2015, 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
 * @summary Additional tests for the OutputAnalyzer utility class when
 * the output comes from a file.
 * @library /testlibrary
 */

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.StandardOpenOption;
import com.oracle.java.testlibrary.OutputAnalyzer;

public class FileOutputAnalyzerTest {

    public static void main(String args[]) throws Exception {
        new FileOutputAnalyzerTest().testBasics();
        new FileOutputAnalyzerTest().testNullPointerException();
        new FileOutputAnalyzerTest().testIOException();
    }

    public void testBasics() throws IOException {
        String expected =
            "line1" + System.lineSeparator()
            + "line2" + System.lineSeparator() 
            + "line3";
        File testFile = new File("test.txt");
        testFile.deleteOnExit();
        Files.write(testFile.toPath(), expected.getBytes(),
        StandardOpenOption.CREATE_NEW);

        OutputAnalyzer analyzer  = new OutputAnalyzer(testFile);
        String actual = analyzer.getStdout();
        if (!expected.equals(actual)) {
            throw new RuntimeException(String.format(
                    "The expected stdout  '%s' doesn't equal to '%s'",
                    expected, actual));
        }
        actual = analyzer.getStderr();
        if (!actual.isEmpty()) {
            throw new RuntimeException(String.format(
                    "The expected stderr should be empty, '%s'", actual));
        }
        actual = analyzer.getOutput();
        if (!expected.equals(actual)) {
            throw new RuntimeException(String.format(
                    "The expected output '%s' doesn't equal to '%s'",
                    expected, actual));
        }
    }

    public void testNullPointerException() throws IOException {
        try {
            new OutputAnalyzer((File) null);
        } catch (NullPointerException e) {
            return;
        }
        throw new RuntimeException("NPE is hidden by OutputAnalyzer's constructor");
    }

    public void testIOException() {
        try {
            // Try to read from a not existing file, it should raise
            // FileNotFoundException. Another cases are not covered
            // due to their complexity and small benefit.
            new OutputAnalyzer(new File("non-existing.file"));
        } catch (IOException e) {
            return;
        }
        throw new RuntimeException("IOException is hidden by OutputAnalyzer's constructor");
    }

}