TestExceptions xref

    1   /*
    2    * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//httpclient/src/test/org/apache/commons/httpclient/TestExceptions.java,v 1.4 2004/03/25 20:37:20 olegk Exp $
    3    * $Revision: 480424 $
    4    * $Date: 2006-11-29 06:56:49 +0100 (Wed, 29 Nov 2006) $
    5    *
    6    * ====================================================================
    7    *
    8    *  Licensed to the Apache Software Foundation (ASF) under one or more
    9    *  contributor license agreements.  See the NOTICE file distributed with
    10   *  this work for additional information regarding copyright ownership.
    11   *  The ASF licenses this file to You under the Apache License, Version 2.0
    12   *  (the "License"); you may not use this file except in compliance with
    13   *  the License.  You may obtain a copy of the License at
    14   *
    15   *      http://www.apache.org/licenses/LICENSE-2.0
    16   *
    17   *  Unless required by applicable law or agreed to in writing, software
    18   *  distributed under the License is distributed on an "AS IS" BASIS,
    19   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    20   *  See the License for the specific language governing permissions and
    21   *  limitations under the License.
    22   * ====================================================================
    23   *
    24   * This software consists of voluntary contributions made by many
    25   * individuals on behalf of the Apache Software Foundation.  For more
    26   * information on the Apache Software Foundation, please see
    27   * <http://www.apache.org/>.
    28   *
    29   */
    30  package org.apache.commons.httpclient;
    31
    32  import java.io.ByteArrayOutputStream;
    33  import java.io.IOException;
    34  import java.io.PrintStream;
    35  import java.io.PrintWriter;
    36  import java.io.StringWriter;
    37
    38  import junit.framework.Test;
    39  import junit.framework.TestCase;
    40  import junit.framework.TestSuite;
    41
    42  /**
    43   *
    44   * @author <a href="mailto:laura@lwerner.org">Laura Werner</a>
    45   */
    46  public class TestExceptions extends TestCase
    47  {
    48
    49      // ------------------------------------------------------------ Constructor
    50      public TestExceptions(String testName) {
    51          super(testName);
    52      }
    53
    54      // ------------------------------------------------------------------- Main
    55      public static void main(String args[]) {
    56          String[] testCaseName = { TestExceptions.class.getName() };
    57          junit.textui.TestRunner.main(testCaseName);
    58      }
    59
    60      // ------------------------------------------------------- TestCase Methods
    61
    62      public static Test suite() {
    63          return new TestSuite(TestExceptions.class);
    64      }
    65
    66      /** Make sure that you can retrieve the "cause" from an HttpException */
    67      public void testGetCause() {
    68
    69          Exception aCause = new IOException("the cause");
    70
    71          try {
    72              throw new HttpException("http exception", aCause);
    73          }
    74          catch (HttpException e) {
    75              assertEquals("Retrieve cause from caught exception", e.getCause(), aCause);
    76          }
    77      }
    78
    79      /** Make sure HttpConnection prints its stack trace to a PrintWriter properly */
    80      public void testStackTraceWriter() {
    81
    82          Exception aCause = new IOException("initial exception");
    83          try {
    84              throw new HttpException("http exception", aCause);
    85          }
    86          catch (HttpException e) {
    87              // Get the stack trace printed into a string
    88              StringWriter stringWriter = new StringWriter();
    89              PrintWriter  writer = new PrintWriter(stringWriter);
    90              e.printStackTrace(writer);
    91              writer.flush();
    92              String stackTrace = stringWriter.toString();
    93
    94              // Do some validation on what got printed
    95              validateStackTrace(e, stackTrace);
    96          }
    97      }
    98
    99      /** Make sure HttpConnection prints its stack trace to a PrintStream properly */
    100     public void testStackTraceStream() {
    101
    102         Exception aCause = new IOException("initial exception");
    103         try {
    104             throw new HttpException("http exception", aCause);
    105         }
    106         catch (HttpException e) {
    107             // Get the stack trace printed into a string
    108             ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
    109             PrintStream  stream = new PrintStream(byteStream);
    110             e.printStackTrace(stream);
    111             stream.flush();
    112             String stackTrace = byteStream.toString();  // Assume default charset
    113
    114             // Do some validation on what got printed
    115             validateStackTrace(e, stackTrace);
    116         }
    117     }
    118
    119     /**
    120      * Make sure an HttpException stack trace has the right info in it.
    121      * This doesn't bother parsing the whole thing, just does some sanity checks.
    122      */
    123     private void validateStackTrace(HttpException exception, String stackTrace) {
    124         assertTrue("Starts with exception string", stackTrace.startsWith(exception.toString()));
    125
    126         Throwable cause = exception.getCause();
    127         if (cause != null) {
    128             assertTrue("Contains 'cause'", stackTrace.toLowerCase().indexOf("cause") != -1);
    129             assertTrue("Contains cause.toString()", stackTrace.indexOf(cause.toString()) != -1);
    130         }
    131     }
    132 }