modules/luni/src/test/api/common/org/apache/harmony/luni/tests/java/io/FileDescriptorTest.java

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.harmony.luni.tests.java.io;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;

import junit.framework.TestCase;

public class FileDescriptorTest extends TestCase {

    private static String platformId = "JDK"
            + System.getProperty("java.vm.version").replace('.', '-');

    FileOutputStream fos;

    BufferedOutputStream os;

    FileInputStream fis;

    File f;

    /**
     * @tests java.io.FileDescriptor#FileDescriptor()
     */
    public void test_Constructor() {
        FileDescriptor fd = new FileDescriptor();
        assertTrue("Failed to create FileDescriptor",
                fd instanceof FileDescriptor);
    }

    /**
     * @tests java.io.FileDescriptor#sync()
     */
    public void test_sync() throws IOException {
        f = new File(System.getProperty("user.dir"), "fd" + platformId + ".tst");
        f.delete();
        fos = new FileOutputStream(f.getPath());
        fos.write("Test String".getBytes());
        fis = new FileInputStream(f.getPath());
        FileDescriptor fd = fos.getFD();
        fd.sync();
        int length = "Test String".length();
        assertEquals("Bytes were not written after sync", length, fis
                .available());

        // Regression test for Harmony-1494
        fd = fis.getFD();
        fd.sync();
        assertEquals("Bytes were not written after sync", length, fis
                .available());

        RandomAccessFile raf = new RandomAccessFile(f, "r");
        fd = raf.getFD();
        fd.sync();
        raf.close();
    }

    /**
     * @tests java.io.FileDescriptor#valid()
     */
    public void test_valid() throws IOException {
        f = new File(System.getProperty("user.dir"), "fd.tst");
        f.delete();
        os = new BufferedOutputStream(fos = new FileOutputStream(f.getPath()),
                4096);
        FileDescriptor fd = fos.getFD();
        assertTrue("Valid fd returned false", fd.valid());
        os.close();
        assertTrue("Invalid fd returned true", !fd.valid());
    }

    /**
     * Tears down the fixture, for example, close a network connection. This
     * method is called after a test is executed.
     */
    protected void tearDown() {
        try {
            os.close();
        } catch (Exception e) {
        }
        try {
            fis.close();
        } catch (Exception e) {
        }
        try {
            fos.close();
        } catch (Exception e) {
        }
        try {
            f.delete();
        } catch (Exception e) {
        }
    }
}