android-platform-libcore/luni/src/test/java/tests/api/java/io/PushbackInputStreamTest.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 tests.api.java.io;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.PushbackInputStream;

import tests.support.Support_ASimpleInputStream;
import dalvik.annotation.TestLevel;
import dalvik.annotation.TestTargetClass;
import dalvik.annotation.TestTargetNew;

@TestTargetClass(PushbackInputStream.class)
public class PushbackInputStreamTest extends junit.framework.TestCase {

    Support_ASimpleInputStream underlying = new Support_ASimpleInputStream();
    PushbackInputStream pis;

    public String fileString = "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.PushbackInputStream#PushbackInputStream(java.io.InputStream)
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "PushbackInputStream",
        args = {java.io.InputStream.class}
    )
    public void test_ConstructorLjava_io_InputStream() {
        // Test for method java.io.PushbackInputStream(java.io.InputStream)
        try {
            pis = new PushbackInputStream(new ByteArrayInputStream("Hello"
                    .getBytes()));
            pis.unread("He".getBytes());
        } catch (IOException e) {
            // Correct
            // Pushback buffer should be full
            return;

        }
        fail("Failed to throw exception on unread when buffer full");
    }

    /**
     * @tests java.io.PushbackInputStream#PushbackInputStream(java.io.InputStream,
     *        int)
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        method = "PushbackInputStream",
        args = {java.io.InputStream.class, int.class}
    )
    public void test_ConstructorLjava_io_InputStreamI() {
        ByteArrayInputStream bas = new ByteArrayInputStream("Hello".getBytes());
        try {
            pis = new PushbackInputStream(bas, 0);
            fail("Test 1: IllegalArgumentException expected.");
        } catch (IllegalArgumentException e) {
            // Expected.
        }
        try {
            pis = new PushbackInputStream(bas, -1);
            fail("Test 2: IllegalArgumentException expected.");
        } catch (IllegalArgumentException e) {
            // Expected.
        }

        pis = new PushbackInputStream(bas , 5);
        try {
            pis.unread("Hello world".getBytes());
            fail("Test 3: IOException expected when the unread buffer is full.");
        } catch (IOException e) {
            // Expected.
        }
    }

    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "close",
        args = {}
    )
    public void test_close() throws IOException {
        PushbackInputStream tobj;

        tobj = new PushbackInputStream(underlying);
        tobj.close();
        tobj.close();
        tobj = new PushbackInputStream(underlying);
        underlying.throwExceptionOnNextUse = true;
        try {
            tobj.close();
            fail("IOException not thrown.");
        } catch (IOException e) {
            // expected
        }
    }

    /**
     * @throws IOException
     * @tests java.io.PushbackInputStream#available()
     */
    @TestTargetNew(
        level = TestLevel.SUFFICIENT,
        notes = "",
        method = "available",
        args = {}
    )
    public void test_available() throws IOException {
        PushbackInputStream tobj;

        tobj = new PushbackInputStream(underlying);
        assertEquals("Wrong number!", 30, tobj.available());
        underlying.throwExceptionOnNextUse = true;
        try {
            tobj.available();
            fail("IOException not thrown.");
        } catch (IOException e) {
            // expected
        }
    }

    /**
     * @tests java.io.PushbackInputStream#markSupported()
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "markSupported",
        args = {}
    )
    public void test_markSupported() {
        // Test for method boolean java.io.PushbackInputStream.markSupported()
        assertTrue("markSupported returned true", !pis.markSupported());
    }

    /**
     * @tests java.io.PushbackInputStream#read()
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL_COMPLETE,
        notes = "",
        method = "read",
        args = {}
    )
    public void test_read() throws IOException {
        PushbackInputStream tobj;

        tobj = new PushbackInputStream(underlying);
        assertEquals("Test 1: Incorrect byte read;", 66, tobj.read());
        underlying.throwExceptionOnNextUse = true;
        try {
            tobj.read();
            fail("Test 2: IOException expected.");
        } catch (IOException e) {
            // expected
        }

        assertEquals("Test 3: Incorrect byte read;",
                fileString.getBytes()[0], pis.read());
    }

    /**
     * @tests java.io.PushbackInputStream#read(byte[], int, int)
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL_COMPLETE,
        notes = "",
        method = "read",
        args = {byte[].class, int.class, int.class}
    )
    public void test_read$BII() throws IOException {
        PushbackInputStream tobj;
        byte[] buf = ("01234567890123456789").getBytes();

        tobj = new PushbackInputStream(underlying);
        tobj.read(buf, 6, 5);
        assertEquals("Wrong value read!", "BEGIN", new String(buf, 6, 5));
        assertEquals("Too much read!", "012345BEGIN123456789", new String(buf));
        underlying.throwExceptionOnNextUse = true;
        try {
            tobj.read(buf, 6, 5);
            fail("IOException not thrown.");
        } catch (IOException e) {
            // expected
        }
    }

    /**
     * @tests java.io.PushbackInputStream#read(byte[], int, int)
     */
    @TestTargetNew(
        level = TestLevel.PARTIAL_COMPLETE,
        notes = "",
        method = "read",
        args = {byte[].class, int.class, int.class}
    )
    public void test_read$BII_Exception() throws IOException {
        PushbackInputStream tobj;
        byte[] buf = new byte[10];

        tobj = new PushbackInputStream(underlying);
        try {
            tobj.read(buf, -1, 1);
            fail("IndexOutOfBoundsException was not thrown");
        } catch (IndexOutOfBoundsException e) {
            // Expected
        }
        try {
            tobj.read(buf, 0, -1);
            fail("IndexOutOfBoundsException was not thrown");
        } catch (IndexOutOfBoundsException e) {
            // Expected
        }
        try {
            tobj.read(buf, 10, 1);
            fail("IndexOutOfBoundsException was not thrown");
        } catch (IndexOutOfBoundsException e) {
            // Expected
        }
    }

    /**
     * @tests java.io.PushbackInputStream#skip(long)
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "skip",
        args = {long.class}
    )
    public void test_skipJ() throws IOException {
        PushbackInputStream tobj;
        byte[] buf = ("01234567890123456789").getBytes();

        tobj = new PushbackInputStream(underlying);
        tobj.skip(6);
        assertEquals("Wrong number!", 30 - 6, tobj.available());
        tobj.skip(1000000);
        tobj.skip(1000000);
        underlying.throwExceptionOnNextUse = true;
        try {
            tobj.skip(1);
            fail("IOException not thrown.");
        } catch (IOException e) {
            // expected
        }

        // Test for method long java.io.PushbackInputStream.skip(long)
        try {
            buf = new byte[50];
            pis.skip(50);
            pis.read(buf, 0, buf.length);
            assertTrue("a) Incorrect bytes read", new String(buf)
                    .equals(fileString.substring(50, 100)));
            pis.unread(buf);
            pis.skip(25);
            byte[] buf2 = new byte[25];
            pis.read(buf2, 0, buf2.length);
            assertTrue("b) Incorrect bytes read", new String(buf2)
                    .equals(fileString.substring(75, 100)));
        } catch (Exception e) {
            fail("Exception during test : " + e.getMessage());
        }
    }

    /**
     * @tests java.io.PushbackInputStream#unread(byte[])
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "unread",
        args = {byte[].class}
    )
    public void test_unread$B() throws IOException {
        PushbackInputStream tobj;
        String str2 = "0123456789";
        byte[] buf2 = str2.getBytes();
        byte[] readBuf = new byte[10];

        tobj = new PushbackInputStream(underlying, 10);
        tobj.unread(buf2);
        assertEquals("Wrong number!", 30 + 10, tobj.available());
        try {
            tobj.unread(buf2);
            fail("IOException not thrown.");
        } catch (IOException e) {
            // expected
        }
        tobj.read(readBuf);
        assertEquals("Incorrect bytes read", str2, new String(readBuf));
        underlying.throwExceptionOnNextUse = true;
        try {
            tobj.read(buf2);
            fail("IOException not thrown.");
        } catch (IOException e) {
            // expected
        }

        // Test for method void java.io.PushbackInputStream.unread(byte [])
        try {
            byte[] buf = new byte[100];
            pis.read(buf, 0, buf.length);
            assertTrue("Incorrect bytes read", new String(buf)
                    .equals(fileString.substring(0, 100)));
            pis.unread(buf);
            pis.read(buf, 0, 50);
            assertTrue("Failed to unread bytes", new String(buf, 0, 50)
                    .equals(fileString.substring(0, 50)));
        } catch (IOException e) {
            fail("IOException during unread test : " + e.getMessage());
        }
    }

    /**
     * @tests java.io.PushbackInputStream#unread(byte[], int, int)
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "unread",
        args = {byte[].class, int.class, int.class}
    )
    public void test_unread$BII() throws IOException {
        PushbackInputStream tobj;
        String str2 = "0123456789";
        byte[] buf2 = (str2 + str2 + str2).getBytes();
        byte[] readBuf = new byte[10];

        tobj = new PushbackInputStream(underlying, 10);
        tobj.unread(buf2, 15, 10);
        assertEquals("Wrong number!", 30 + 10, tobj.available());
        try {
            tobj.unread(buf2, 15, 10);
            fail("IOException not thrown.");
        } catch (IOException e) {
            // expected
        }
        tobj.read(readBuf);
        assertEquals("Incorrect bytes read", "5678901234", new String(readBuf));
        underlying.throwExceptionOnNextUse = true;
        try {
            tobj.read(buf2, 15, 10);
            fail("IOException not thrown.");
        } catch (IOException e) {
            // expected
        }

        // Test for method void java.io.PushbackInputStream.unread(byte [], int,
        // int)
        try {
            byte[] buf = new byte[100];
            pis.read(buf, 0, buf.length);
            assertTrue("Incorrect bytes read", new String(buf)
                    .equals(fileString.substring(0, 100)));
            pis.unread(buf, 50, 50);
            pis.read(buf, 0, 50);
            assertTrue("Failed to unread bytes", new String(buf, 0, 50)
                    .equals(fileString.substring(50, 100)));
        } catch (IOException e) {
            fail("IOException during unread test : " + e.getMessage());
        }

        try {
            byte[] buf = new byte[10];
            pis.unread(buf, 0, -1);
            fail("IndexOutOfBoundsException was not thrown");
        } catch (IndexOutOfBoundsException e) {
            // Expected
        }

        try {
            byte[] buf = new byte[10];
            pis.unread(buf, -1, 1);
            fail("IndexOutOfBoundsException was not thrown");
        } catch (IndexOutOfBoundsException e) {
            // Expected
        }

        try {
            byte[] buf = new byte[10];
            pis.unread(buf, 10, 1);
            fail("IndexOutOfBoundsException was not thrown");
        } catch (IndexOutOfBoundsException e) {
            // Expected
        }
    }

    /**
     * @tests java.io.PushbackInputStream#unread(int)
     */
    @TestTargetNew(
        level = TestLevel.COMPLETE,
        notes = "",
        method = "unread",
        args = {int.class}
    )
    public void test_unreadI() throws IOException {
        PushbackInputStream tobj;

        tobj = new PushbackInputStream(underlying);
        tobj.unread(23); // Why does this work?!?
        tobj.skip(2);
        tobj.unread(23);
        assertEquals("Wrong number!", 30, tobj.available());
        assertEquals("Wrong value read!", 23, tobj.read());
        tobj.unread(13);
        try {
            tobj.unread(13);
            fail("IOException not thrown (ACTUALLY NOT SURE WHETHER IT REALLY MUST BE THROWN!).");
        } catch (IOException e) {
            // expected
        }

        // Test for method void java.io.PushbackInputStream.unread(int)
        try {
            int x;
            assertTrue("Incorrect byte read", (x = pis.read()) == fileString
                    .getBytes()[0]);
            pis.unread(x);
            assertTrue("Failed to unread", pis.read() == x);
        } catch (IOException e) {
            fail("IOException during read test : " + e.getMessage());
        }
    }

    /**
     * Sets up the fixture, for example, open a network connection. This method
     * is called before a test is executed.
     */
    protected void setUp() {

        pis = new PushbackInputStream(new ByteArrayInputStream(fileString
                .getBytes()), 65535);
    }

    /**
     * Tears down the fixture, for example, close a network connection. This
     * method is called after a test is executed.
     */
    protected void tearDown() {
        try {
            pis.close();
        } catch (IOException e) {
            fail("IOException during tearDown : " + e.getMessage());
        }
    }
}