unit test for counting input stream

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/io/trunk@140416 13f79535-47bb-0310-9956-ffa450edef68

Author: hen

src/test/org/apache/commons/io/input/CountingInputStreamTest.java

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+/*
+ * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//io/src/test/org/apache/commons/io/input/CountingInputStreamTest.java,v 1.1 2003/11/23 09:20:54 bayard Exp $
+ * $Revision: 1.1 $
+ * $Date: 2003/11/23 09:20:54 $
+ *
+ * ====================================================================
+ *
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2003 The Apache Software Foundation.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution, if
+ *    any, must include the following acknowledgement:
+ *       "This product includes software developed by the
+ *        Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowledgement may appear in the software itself,
+ *    if and wherever such third-party acknowledgements normally appear.
+ *
+ * 4. The names "The Jakarta Project", "Commons", and "Apache Software
+ *    Foundation" must not be used to endorse or promote products derived
+ *    from this software without prior written permission. For written
+ *    permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache"
+ *    nor may "Apache" appear in their names without prior written
+ *    permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+
+package org.apache.commons.io.input;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.ByteArrayInputStream;
+
+import junit.framework.TestCase;
+
+/**
+ * Tests the CountingInputStream.
+ *
+ * @author <a href="mailto:bayard@apache.org">Henri Yandell</a>
+ */
+public final class CountingInputStreamTest extends TestCase {
+
+    public CountingInputStreamTest(String name) {
+        super(name);
+    }
+
+    public void testCounting() throws Exception {
+        String text = "A piece of text";
+        byte[] bytes = text.getBytes();
+        ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
+        CountingInputStream cis = new CountingInputStream(bais);
+
+        // have to declare this larger as we're going to read 
+        // off the end of the stream and input stream seems 
+        // to do bounds checking
+        byte[] result = new byte[21];
+
+        byte[] ba = new byte[5];
+        int found = cis.read(ba);
+        System.arraycopy(ba, 0, result, 0, 5);
+        assertEquals( found, cis.getCount() );
+
+        int value = cis.read();
+        found++; 
+        result[5] = (byte)value;
+        assertEquals( found, cis.getCount() );
+
+        found += cis.read(result, 6, 5);
+        assertEquals( found, cis.getCount() );
+
+        found += cis.read(result, 11, 10); // off the end
+        assertEquals( found, cis.getCount() );
+
+        // trim to get rid of the 6 empty values
+        String textResult = new String(result).trim();
+        assertEquals(textResult, text);
+    }
+}
+