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Commons IO example source code file (IOUtilsWriteTestCase.java)

This example Commons IO source code file (IOUtilsWriteTestCase.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons IO tags/keywords

bytearrayoutputstream, bytearrayoutputstream, content, exception, exception, io, nullpointerexception, object, sizes, string, string, us-ascii, util, writer, yellonflushandcloseoutputstream, yellonflushandcloseoutputstream

The Commons IO IOUtilsWriteTestCase.java source code

/*
 * 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.commons.io;

import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.Arrays;
import java.util.List;

import org.apache.commons.io.output.ByteArrayOutputStream;
import org.apache.commons.io.testtools.FileBasedTestCase;
import org.apache.commons.io.testtools.YellOnFlushAndCloseOutputStream;

/**
 * JUnit tests for IOUtils write methods.
 * 
 * @author Jeff Turner
 * @author Matthew Hawthorne
 * @author Jeremias Maerki
 * @author Stephen Colebourne
 * @version $Id: IOUtilsWriteTestCase.java 919474 2010-03-05 16:31:43Z sebb $
 * @see IOUtils
 */
public class IOUtilsWriteTestCase extends FileBasedTestCase {

    private static final int FILE_SIZE = 1024 * 4 + 1;


    private byte[] inData = generateTestData(FILE_SIZE);

    public IOUtilsWriteTestCase(String testName) {
        super(testName);
    }

    // ----------------------------------------------------------------
    // Setup
    // ----------------------------------------------------------------

    @Override
    public void setUp() throws Exception {
    }

    @Override
    public void tearDown() throws Exception {
    }

    // ----------------------------------------------------------------
    // Tests
    // ----------------------------------------------------------------

    //-----------------------------------------------------------------------
    public void testWrite_byteArrayToOutputStream() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        
        IOUtils.write(inData, out);
        out.off();
        out.flush();

        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }

    public void testWrite_byteArrayToOutputStream_nullData() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        
        IOUtils.write((byte[]) null, out);
        out.off();
        out.flush();

        assertEquals("Sizes differ", 0, baout.size());
    }

    public void testWrite_byteArrayToOutputStream_nullStream() throws Exception {
        try {
            IOUtils.write(inData, (OutputStream) null);
            fail();
        } catch (NullPointerException ex) {}
    }

    //-----------------------------------------------------------------------
    public void testWrite_byteArrayToWriter() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(baout, "US-ASCII");
        
        IOUtils.write(inData, writer);
        out.off();
        writer.flush();

        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }

    public void testWrite_byteArrayToWriter_nullData() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(baout, "US-ASCII");
        
        IOUtils.write((byte[]) null, writer);
        out.off();
        writer.flush();

        assertEquals("Sizes differ", 0, baout.size());
    }

    public void testWrite_byteArrayToWriter_nullWriter() throws Exception {
        try {
            IOUtils.write(inData, (Writer) null);
            fail();
        } catch (NullPointerException ex) {}
    }

    //-----------------------------------------------------------------------
    public void testWrite_byteArrayToWriter_Encoding() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(baout, "US-ASCII");
        
        IOUtils.write(inData, writer, "UTF8");
        out.off();
        writer.flush();

        byte[] bytes = baout.toByteArray();
        bytes = new String(bytes, "UTF8").getBytes("US-ASCII");
        assertTrue("Content differs", Arrays.equals(inData, bytes));
    }

    public void testWrite_byteArrayToWriter_Encoding_nullData() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(baout, "US-ASCII");
        
        IOUtils.write((byte[]) null, writer, "UTF8");
        out.off();
        writer.flush();

        assertEquals("Sizes differ", 0, baout.size());
    }

    public void testWrite_byteArrayToWriter_Encoding_nullWriter() throws Exception {
        try {
            IOUtils.write(inData, (Writer) null, "UTF8");
            fail();
        } catch (NullPointerException ex) {}
    }

    public void testWrite_byteArrayToWriter_Encoding_nullEncoding() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(baout, "US-ASCII");
        
        IOUtils.write(inData, writer, null);
        out.off();
        writer.flush();
        
        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }
    //-----------------------------------------------------------------------
    public void testWrite_charSequenceToOutputStream() throws Exception {
        CharSequence csq = new StringBuilder(new String(inData, "US-ASCII"));
        
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        
        IOUtils.write(csq, out);
        out.off();
        out.flush();
        
        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }

    public void testWrite_charSequenceToOutputStream_nullData() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        
        IOUtils.write((CharSequence) null, out);
        out.off();
        out.flush();

        assertEquals("Sizes differ", 0, baout.size());
    }

    public void testWrite_charSequenceToOutputStream_nullStream() throws Exception {
        CharSequence csq = new StringBuilder(new String(inData, "US-ASCII"));
        try {
            IOUtils.write(csq, (OutputStream) null);
            fail();
        } catch (NullPointerException ex) {}
    }

    //-----------------------------------------------------------------------
    public void testWrite_charSequenceToOutputStream_Encoding() throws Exception {
        CharSequence csq = new StringBuilder(new String(inData, "US-ASCII"));
        
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);

        IOUtils.write(csq, out, "UTF16");
        out.off();
        out.flush();
        
        byte[] bytes = baout.toByteArray();
        bytes = new String(bytes, "UTF16").getBytes("US-ASCII");
        assertTrue("Content differs", Arrays.equals(inData, bytes));
    }

    public void testWrite_charSequenceToOutputStream_Encoding_nullData() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        
        IOUtils.write((CharSequence) null, out);
        out.off();
        out.flush();

        assertEquals("Sizes differ", 0, baout.size());
    }

    public void testWrite_charSequenceToOutputStream_Encoding_nullStream() throws Exception {
        CharSequence csq = new StringBuilder(new String(inData, "US-ASCII"));
        try {
            IOUtils.write(csq, (OutputStream) null);
            fail();
        } catch (NullPointerException ex) {}
    }

    public void testWrite_charSequenceToOutputStream_nullEncoding() throws Exception {
        CharSequence csq = new StringBuilder(new String(inData, "US-ASCII"));
        
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);

        IOUtils.write(csq, out, null);
        out.off();
        out.flush();

        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }

    //-----------------------------------------------------------------------
    public void testWrite_charSequenceToWriter() throws Exception {
        CharSequence csq = new StringBuilder(new String(inData, "US-ASCII"));

        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(baout, "US-ASCII");

        IOUtils.write(csq, writer);
        out.off();
        writer.flush();

        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }

    public void testWrite_charSequenceToWriter_Encoding_nullData() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(baout, "US-ASCII");
        
        IOUtils.write((CharSequence) null, writer);
        out.off();
        writer.flush();

        assertEquals("Sizes differ", 0, baout.size());
    }

    public void testWrite_charSequenceToWriter_Encoding_nullStream() throws Exception {
        CharSequence csq = new StringBuilder(new String(inData, "US-ASCII"));
        try {
            IOUtils.write(csq, (Writer) null);
            fail();
        } catch (NullPointerException ex) {}
    }
    //-----------------------------------------------------------------------
    public void testWrite_stringToOutputStream() throws Exception {
        String str = new String(inData, "US-ASCII");
        
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        
        IOUtils.write(str, out);
        out.off();
        out.flush();
        
        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }

    public void testWrite_stringToOutputStream_nullData() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        
        IOUtils.write((String) null, out);
        out.off();
        out.flush();

        assertEquals("Sizes differ", 0, baout.size());
    }

    public void testWrite_stringToOutputStream_nullStream() throws Exception {
        String str = new String(inData, "US-ASCII");
        try {
            IOUtils.write(str, (OutputStream) null);
            fail();
        } catch (NullPointerException ex) {}
    }

    //-----------------------------------------------------------------------
    public void testWrite_stringToOutputStream_Encoding() throws Exception {
        String str = new String(inData, "US-ASCII");
        
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);

        IOUtils.write(str, out, "UTF16");
        out.off();
        out.flush();
        
        byte[] bytes = baout.toByteArray();
        bytes = new String(bytes, "UTF16").getBytes("US-ASCII");
        assertTrue("Content differs", Arrays.equals(inData, bytes));
    }

    public void testWrite_stringToOutputStream_Encoding_nullData() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        
        IOUtils.write((String) null, out);
        out.off();
        out.flush();

        assertEquals("Sizes differ", 0, baout.size());
    }

    public void testWrite_stringToOutputStream_Encoding_nullStream() throws Exception {
        String str = new String(inData, "US-ASCII");
        try {
            IOUtils.write(str, (OutputStream) null);
            fail();
        } catch (NullPointerException ex) {}
    }

    public void testWrite_stringToOutputStream_nullEncoding() throws Exception {
        String str = new String(inData, "US-ASCII");
        
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);

        IOUtils.write(str, out, null);
        out.off();
        out.flush();

        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }

    //-----------------------------------------------------------------------
    public void testWrite_stringToWriter() throws Exception {
        String str = new String(inData, "US-ASCII");

        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(baout, "US-ASCII");

        IOUtils.write(str, writer);
        out.off();
        writer.flush();

        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }

    public void testWrite_stringToWriter_Encoding_nullData() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(baout, "US-ASCII");
        
        IOUtils.write((String) null, writer);
        out.off();
        writer.flush();

        assertEquals("Sizes differ", 0, baout.size());
    }

    public void testWrite_stringToWriter_Encoding_nullStream() throws Exception {
        String str = new String(inData, "US-ASCII");
        try {
            IOUtils.write(str, (Writer) null);
            fail();
        } catch (NullPointerException ex) {}
    }

    //-----------------------------------------------------------------------
    public void testWrite_charArrayToOutputStream() throws Exception {
        String str = new String(inData, "US-ASCII");
        
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);

        IOUtils.write(str.toCharArray(), out);
        out.off();
        out.flush();

        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }

    public void testWrite_charArrayToOutputStream_nullData() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        
        IOUtils.write((char[]) null, out);
        out.off();
        out.flush();

        assertEquals("Sizes differ", 0, baout.size());
    }

    public void testWrite_charArrayToOutputStream_nullStream() throws Exception {
        String str = new String(inData, "US-ASCII");
        try {
            IOUtils.write(str.toCharArray(), (OutputStream) null);
            fail();
        } catch (NullPointerException ex) {}
    }

    //-----------------------------------------------------------------------
    public void testWrite_charArrayToOutputStream_Encoding() throws Exception {
        String str = new String(inData, "US-ASCII");
        
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);

        IOUtils.write(str.toCharArray(), out, "UTF16");
        out.off();
        out.flush();
        
        byte[] bytes = baout.toByteArray();
        bytes = new String(bytes, "UTF16").getBytes("US-ASCII");
        assertTrue("Content differs", Arrays.equals(inData, bytes));
    }

    public void testWrite_charArrayToOutputStream_Encoding_nullData() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        
        IOUtils.write((char[]) null, out);
        out.off();
        out.flush();

        assertEquals("Sizes differ", 0, baout.size());
    }

    public void testWrite_charArrayToOutputStream_Encoding_nullStream() throws Exception {
        String str = new String(inData, "US-ASCII");
        try {
            IOUtils.write(str.toCharArray(), (OutputStream) null);
            fail();
        } catch (NullPointerException ex) {}
    }

    public void testWrite_charArrayToOutputStream_nullEncoding() throws Exception {
        String str = new String(inData, "US-ASCII");
        
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);

        IOUtils.write(str.toCharArray(), out, null);
        out.off();
        out.flush();

        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }

    //-----------------------------------------------------------------------
    public void testWrite_charArrayToWriter() throws Exception {
        String str = new String(inData, "US-ASCII");

        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(baout, "US-ASCII");

        IOUtils.write(str.toCharArray(), writer);
        out.off();
        writer.flush();

        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }

    public void testWrite_charArrayToWriter_Encoding_nullData() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(baout, "US-ASCII");
        
        IOUtils.write((char[]) null, writer);
        out.off();
        writer.flush();

        assertEquals("Sizes differ", 0, baout.size());
    }

    public void testWrite_charArrayToWriter_Encoding_nullStream() throws Exception {
        String str = new String(inData, "US-ASCII");
        try {
            IOUtils.write(str.toCharArray(), (Writer) null);
            fail();
        } catch (NullPointerException ex) {}
    }

    //-----------------------------------------------------------------------
    public void testWriteLines_OutputStream() throws Exception {
        Object[] data = new Object[] {
            "hello", new StringBuffer("world"), "", "this is", null, "some text"};
        List<Object> list = Arrays.asList(data);
        
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, false, true);
        
        IOUtils.writeLines(list, "*", out);
        
        out.off();
        out.flush();
        
        String expected = "hello*world**this is**some text*";
        String actual = baout.toString();
        assertEquals(expected, actual);
    }

    public void testWriteLines_OutputStream_nullData() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, false, true);
        
        IOUtils.writeLines((List<?>) null, "*", out);
        out.off();
        out.flush();
        
        assertEquals("Sizes differ", 0, baout.size());
    }

    public void testWriteLines_OutputStream_nullSeparator() throws Exception {
        Object[] data = new Object[] {"hello", "world"};
        List<Object> list = Arrays.asList(data);
            
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, false, true);
        
        IOUtils.writeLines(list, (String) null, out);
        out.off();
        out.flush();
        
        String expected = "hello" + IOUtils.LINE_SEPARATOR + "world" + IOUtils.LINE_SEPARATOR;
        String actual = baout.toString();
        assertEquals(expected, actual);
    }

    public void testWriteLines_OutputStream_nullStream() throws Exception {
        Object[] data = new Object[] {"hello", "world"};
        List<Object> list = Arrays.asList(data);
        try {
            IOUtils.writeLines(list, "*", (OutputStream) null);
            fail();
        } catch (NullPointerException ex) {}
    }

    //-----------------------------------------------------------------------
    public void testWriteLines_OutputStream_Encoding() throws Exception {
        Object[] data = new Object[] {
            "hello\u8364", new StringBuffer("world"), "", "this is", null, "some text"};
        List<Object> list = Arrays.asList(data);
        
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, false, true);
        
        IOUtils.writeLines(list, "*", out, "UTF-8");
        
        out.off();
        out.flush();
        
        String expected = "hello\u8364*world**this is**some text*";
        String actual = baout.toString("UTF-8");
        assertEquals(expected, actual);
    }

    public void testWriteLines_OutputStream_Encoding_nullData() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, false, true);
        
        IOUtils.writeLines((List<?>) null, "*", out, "US-ASCII");
        out.off();
        out.flush();
        
        assertEquals("Sizes differ", 0, baout.size());
    }

    public void testWriteLines_OutputStream_Encoding_nullSeparator() throws Exception {
        Object[] data = new Object[] {"hello", "world"};
        List<Object> list = Arrays.asList(data);
            
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, false, true);
        
        IOUtils.writeLines(list, (String) null, out, "US-ASCII");
        out.off();
        out.flush();
        
        String expected = "hello" + IOUtils.LINE_SEPARATOR + "world" + IOUtils.LINE_SEPARATOR;
        String actual = baout.toString();
        assertEquals(expected, actual);
    }

    public void testWriteLines_OutputStream_Encoding_nullStream() throws Exception {
        Object[] data = new Object[] {"hello", "world"};
        List<Object> list = Arrays.asList(data);
        try {
            IOUtils.writeLines(list, "*", (OutputStream) null, "US-ASCII");
            fail();
        } catch (NullPointerException ex) {}
    }

    public void testWriteLines_OutputStream_Encoding_nullEncoding() throws Exception {
        Object[] data = new Object[] {
            "hello", new StringBuffer("world"), "", "this is", null, "some text"};
        List<Object> list = Arrays.asList(data);
        
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, false, true);
        
        IOUtils.writeLines(list, "*", out, null);
        
        out.off();
        out.flush();
        
        String expected = "hello*world**this is**some text*";
        String actual = baout.toString();
        assertEquals(expected, actual);
    }

    //-----------------------------------------------------------------------
    public void testWriteLines_Writer() throws Exception {
        Object[] data = new Object[] {
            "hello", new StringBuffer("world"), "", "this is", null, "some text"};
        List<Object> list = Arrays.asList(data);
        
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(baout, "US-ASCII");
        
        IOUtils.writeLines(list, "*", writer);
        
        out.off();
        writer.flush();
        
        String expected = "hello*world**this is**some text*";
        String actual = baout.toString();
        assertEquals(expected, actual);
    }

    public void testWriteLines_Writer_nullData() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(baout, "US-ASCII");
        
        IOUtils.writeLines((List<?>) null, "*", writer);
        out.off();
        writer.flush();
        
        assertEquals("Sizes differ", 0, baout.size());
    }

    public void testWriteLines_Writer_nullSeparator() throws Exception {
        Object[] data = new Object[] {"hello", "world"};
        List<Object> list = Arrays.asList(data);
            
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(baout, "US-ASCII");
        
        IOUtils.writeLines(list, (String) null, writer);
        out.off();
        writer.flush();
        
        String expected = "hello" + IOUtils.LINE_SEPARATOR + "world" + IOUtils.LINE_SEPARATOR;
        String actual = baout.toString();
        assertEquals(expected, actual);
    }

    public void testWriteLines_Writer_nullStream() throws Exception {
        Object[] data = new Object[] {"hello", "world"};
        List<Object> list = Arrays.asList(data);
        try {
            IOUtils.writeLines(list, "*", (Writer) null);
            fail();
        } catch (NullPointerException ex) {}
    }

}

Other Commons IO examples (source code examples)

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