org.cservenak.streams.CoderTest.java Source code

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Here is the source code for org.cservenak.streams.CoderTest.java

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/*
 *  Copyright (c) 2011 Tamas Cservenak. All rights reserved.
 *
 *  <tamas@cservenak.com>
 *  http://www.cservenak.com/
 *
 *  Licensed 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.cservenak.streams;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;

import junit.framework.Assert;
import junit.framework.TestCase;

public class CoderTest extends TestCase {
    public void testSomeNastyClass() throws IOException {
        File baseDir = new File("target/test-classes");
        File inputFile = new File(baseDir, "input.txt");
        File middleFile = new File(baseDir, "middle.txt");
        File outputFile = new File(baseDir, "output.txt");

        InputStream is = null;
        OutputStream os = null;

        // copy original - middle
        is = new FileInputStream(inputFile);
        os = new DummyOutputStream(new FileOutputStream(middleFile), 'a');

        IOUtils.copy(is, os);
        os.flush();
        IOUtils.closeQuietly(os);
        IOUtils.closeQuietly(is);

        // copy middle - output
        is = new DummyInputStream(new FileInputStream(middleFile), 'b');
        os = new FileOutputStream(outputFile);

        IOUtils.copy(is, os);
        os.flush();
        IOUtils.closeQuietly(os);
        IOUtils.closeQuietly(is);

        // assertions
        // inputFile is 8 byte length, some random content
        Assert.assertEquals("input file is 8 bytes!", 8, inputFile.length());

        // middleFile is also 8 byte length, and is not equal with inputFile since it's all 'a's.
        Assert.assertEquals("middle file is 8 bytes!", 8, middleFile.length());
        Assert.assertFalse("input and middle file should differ!", FileUtils.contentEquals(inputFile, middleFile));

        // outputFile is also 8 byte length, and is not equal with input and with middle file neither, since it's all 'b's
        Assert.assertEquals("middle file is 8 bytes!", 8, outputFile.length());
        Assert.assertFalse("input and output file should differ!", FileUtils.contentEquals(inputFile, outputFile));
        Assert.assertFalse("middle and output file should differ!",
                FileUtils.contentEquals(middleFile, outputFile));
    }

}