java/io/BufferedWriterTest.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.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;

import tests.support.Support_StringWriter;

public class BufferedWriterTest extends junit.framework.TestCase {

    BufferedWriter bw;

    Support_StringWriter sw;

    public String testString = "Test_All_Tests\nTest_java_io_BufferedInputStream\nTest_java_io_BufferedOutputStream\nTest_java_io_ByteArrayInputStream\nTest_java_io_ByteArrayOutputStream\nTest_java_io_DataInputStream\nTest_java_io_File\nTest_java_io_FileDescriptor\nTest_java_io_FileInputStream\nTest_java_io_FileNotFoundException\nTest_java_io_FileOutputStream\nTest_java_io_FilterInputStream\nTest_java_io_FilterOutputStream\nTest_java_io_InputStream\nTest_java_io_IOException\nTest_java_io_OutputStream\nTest_java_io_PrintStream\nTest_java_io_RandomAccessFile\nTest_java_io_SyncFailedException\nTest_java_lang_AbstractMethodError\nTest_java_lang_ArithmeticException\nTest_java_lang_ArrayIndexOutOfBoundsException\nTest_java_lang_ArrayStoreException\nTest_java_lang_Boolean\nTest_java_lang_Byte\nTest_java_lang_Character\nTest_java_lang_Class\nTest_java_lang_ClassCastException\nTest_java_lang_ClassCircularityError\nTest_java_lang_ClassFormatError\nTest_java_lang_ClassLoader\nTest_java_lang_ClassNotFoundException\nTest_java_lang_CloneNotSupportedException\nTest_java_lang_Double\nTest_java_lang_Error\nTest_java_lang_Exception\nTest_java_lang_ExceptionInInitializerError\nTest_java_lang_Float\nTest_java_lang_IllegalAccessError\nTest_java_lang_IllegalAccessException\nTest_java_lang_IllegalArgumentException\nTest_java_lang_IllegalMonitorStateException\nTest_java_lang_IllegalThreadStateException\nTest_java_lang_IncompatibleClassChangeError\nTest_java_lang_IndexOutOfBoundsException\nTest_java_lang_InstantiationError\nTest_java_lang_InstantiationException\nTest_java_lang_Integer\nTest_java_lang_InternalError\nTest_java_lang_InterruptedException\nTest_java_lang_LinkageError\nTest_java_lang_Long\nTest_java_lang_Math\nTest_java_lang_NegativeArraySizeException\nTest_java_lang_NoClassDefFoundError\nTest_java_lang_NoSuchFieldError\nTest_java_lang_NoSuchMethodError\nTest_java_lang_NullPointerException\nTest_java_lang_Number\nTest_java_lang_NumberFormatException\nTest_java_lang_Object\nTest_java_lang_OutOfMemoryError\nTest_java_lang_RuntimeException\nTest_java_lang_SecurityManager\nTest_java_lang_Short\nTest_java_lang_StackOverflowError\nTest_java_lang_String\nTest_java_lang_StringBuffer\nTest_java_lang_StringIndexOutOfBoundsException\nTest_java_lang_System\nTest_java_lang_Thread\nTest_java_lang_ThreadDeath\nTest_java_lang_ThreadGroup\nTest_java_lang_Throwable\nTest_java_lang_UnknownError\nTest_java_lang_UnsatisfiedLinkError\nTest_java_lang_VerifyError\nTest_java_lang_VirtualMachineError\nTest_java_lang_vm_Image\nTest_java_lang_vm_MemorySegment\nTest_java_lang_vm_ROMStoreException\nTest_java_lang_vm_VM\nTest_java_lang_Void\nTest_java_net_BindException\nTest_java_net_ConnectException\nTest_java_net_DatagramPacket\nTest_java_net_DatagramSocket\nTest_java_net_DatagramSocketImpl\nTest_java_net_InetAddress\nTest_java_net_NoRouteToHostException\nTest_java_net_PlainDatagramSocketImpl\nTest_java_net_PlainSocketImpl\nTest_java_net_Socket\nTest_java_net_SocketException\nTest_java_net_SocketImpl\nTest_java_net_SocketInputStream\nTest_java_net_SocketOutputStream\nTest_java_net_UnknownHostException\nTest_java_util_ArrayEnumerator\nTest_java_util_Date\nTest_java_util_EventObject\nTest_java_util_HashEnumerator\nTest_java_util_Hashtable\nTest_java_util_Properties\nTest_java_util_ResourceBundle\nTest_java_util_tm\nTest_java_util_Vector\n";

    /**
     * @tests java.io.BufferedWriter#BufferedWriter(java.io.Writer)
     */
    public void test_ConstructorLjava_io_Writer() {
        sw = new Support_StringWriter();
        bw = new BufferedWriter(sw);
        sw.write("Hi");
        assertEquals("Constructor failed", "Hi", sw.toString());
    }

    /**
     * @tests java.io.BufferedWriter#BufferedWriter(java.io.Writer, int)
     */
    public void test_ConstructorLjava_io_WriterI() {
        assertTrue("Used in tests", true);
    }

    private static class MockWriter extends Writer {
        StringBuffer sb = new StringBuffer();
        boolean flushCalled = false;

        public void write(char[] buf, int off, int len) throws IOException {
            for (int i = off; i < off + len; i++) {
                sb.append(buf[i]);
            }
        }

        public void close() throws IOException {
            // Empty
        }

        public void flush() throws IOException {
            flushCalled = true;
        }

        public String getWritten() {
            return sb.toString();
        }

        public boolean isFlushCalled() {
            return flushCalled;
        }
    }

    /**
     * @tests java.io.BufferedWriter#close()
     */
    public void test_close() throws IOException {
        try {
            bw.close();
            bw.write(testString);
            fail("Writing to a closed stream should throw IOException");
        } catch (IOException e) {
            // Expected
        }
        assertTrue("Write after close", !sw.toString().equals(testString));

        // Regression test for HARMONY-4178
        MockWriter mw = new MockWriter();
        BufferedWriter bw = new BufferedWriter(mw);
        bw.write('a');
        bw.close();

        // flush should not be called on underlying stream
        assertFalse("Flush was called in the underlying stream", mw
                .isFlushCalled());

        // on the other hand the BufferedWriter itself should flush the
        // buffer
        assertEquals("BufferdWriter do not flush itself before close", "a", mw
                .getWritten());
    }

    /**
     * @throws IOException
     * @tests java.io.BufferedWriter#close()
     *
     */
    public void test_close2() throws IOException {
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new ByteArrayOutputStream()));
            bw.close();
    }

    /**
     * @tests java.io.BufferedWriter#flush()
     */
    public void test_flush() throws Exception {
        bw.write("This should not cause a flush");
        assertTrue("Bytes written without flush", sw.toString().equals(""));
        bw.flush();
        assertEquals("Bytes not flushed", "This should not cause a flush", sw
                .toString());
    }

    /**
     * @tests java.io.BufferedWriter#newLine()
     */
    public void test_newLine() throws Exception {
        String separator = System.getProperty("line.separator");
        bw.write("Hello");
        bw.newLine();
        bw.write("World");
        bw.flush();
        assertTrue("Incorrect string written: " + sw.toString(), sw.toString()
                .equals("Hello" + separator + "World"));
    }

    /**
     * @tests java.io.BufferedWriter#write(char[], int, int)
     */
    public void test_write$CII() throws Exception {
        char[] testCharArray = testString.toCharArray();
        bw.write(testCharArray, 500, 1000);
        bw.flush();
        assertTrue("Incorrect string written", sw.toString().equals(
                testString.substring(500, 1500)));
    }

    /**
     * @tests java.io.BufferedWriter#write(char[], int, int)
     */
    public void test_write_$CII_Exception() throws IOException {
        BufferedWriter bWriter = new BufferedWriter(sw);
        char[] nullCharArray = null;

        try {
            bWriter.write(nullCharArray, -1, -1);
            fail("should throw IndexOutOfBoundsException");
        } catch (NullPointerException expected) {
        } catch (IndexOutOfBoundsException expected) {
        }

        try {
            bWriter.write(nullCharArray, -1, 0);
            fail();
        } catch (NullPointerException expected) {
        } catch (IndexOutOfBoundsException expected) {
        }

        try {
            bWriter.write(nullCharArray, 0, -1);
            fail("should throw NullPointerException");
        } catch (NullPointerException e) {
            // expected
        }

        try {
            bWriter.write(nullCharArray, 0, 0);
            fail("should throw NullPointerException");
        } catch (NullPointerException e) {
            // expected
        }

        char[] testCharArray = testString.toCharArray();

        bWriter.write(testCharArray, 0, 0);

        bWriter.write(testCharArray, testCharArray.length, 0);

        try {
            bWriter.write(testCharArray, testCharArray.length + 1, 0);
            fail("should throw IndexOutOfBoundsException");
        } catch (IndexOutOfBoundsException e) {
            // expected
        }

        bWriter.close();

        try {
            bWriter.write(nullCharArray, -1, -1);
            fail("should throw IOException");
        } catch (IOException e) {
            // expected
        }
    }

    /**
     * @tests java.io.BufferedWriter#write(int)
     */
    public void test_writeI() throws Exception {
        bw.write('T');
        assertTrue("Char written without flush", sw.toString().equals(""));
        bw.flush();
        assertEquals("Incorrect char written", "T", sw.toString());
    }

    /**
     * @tests java.io.BufferedWriter#write(java.lang.String, int, int)
     */
    public void test_writeLjava_lang_StringII() throws Exception {
        bw.write(testString);
        bw.flush();
        assertTrue("Incorrect string written", sw.toString().equals(testString));
    }

    /**
     * @tests java.io.BufferedWriter#write(java.lang.String, int, int)
     */
    public void test_write_LStringII_Exception() throws IOException {
        BufferedWriter bWriter = new BufferedWriter(sw);

        bWriter.write((String) null, -1, -1);
        bWriter.write((String) null, -1, 0);
        bWriter.write((String) null, 0, -1);
        bWriter.write((String) null, 0, 0);

        try {
            bWriter.write((String) null, -1, 1);
            fail("should throw NullPointerException");
        } catch (NullPointerException e) {
            // expected
        }

        bWriter.write(testString, 0, 0);
        bWriter.write(testString, testString.length(), 0);
        bWriter.write(testString, testString.length() + 1, 0);

        try {
            bWriter.write(testString, testString.length() + 1, 1);
            fail("should throw StringIndexOutOfBoundsException");
        } catch (StringIndexOutOfBoundsException e) {
            // expected
        }

        bWriter.close();

        try {
            bWriter.write((String) null, -1, -1);
            fail("should throw IOException");
        } catch (IOException e) {
            // expected
        }

        try {
            bWriter.write((String) null, -1, 1);
            fail("should throw IOException");
        } catch (IOException e) {
            // expected
        }

        try {
            bWriter.write(testString, -1, -1);
            fail("should throw IOException");
        } catch (IOException e) {
            // expected
        }
    }

    /**
     * Sets up the fixture, for example, open a network connection. This method
     * is called before a test is executed.
     */
    protected void setUp() {
        sw = new Support_StringWriter();
        bw = new BufferedWriter(sw, 500);
    }

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