Good Tutorial on Testing Exceptions Using JUnit

I must admit, I have not done much with JUnit 4 – even though it has been out for a very long time. I came across a blog post by John Ferguson Smart entitled Testing Exceptions in JUnit 4.7. This is a great tutorial on how to JUnit 4 is evolving to make testing thrown exceptions easier.

Not only is this a good tutorial, it has inspired me to take a closer look at JUnit 4.

 

August 2010 mensming Twitter Posts

Follow mensming on Twitter

How the internet is changing language – http://bbc.in/c7r4Eh
Aug 31, 2010

Google backs out of JavaOne conference – http://bit.ly/bEcehD
Aug 30, 2010

Only 40? – Update: 40 Windows apps contain critical bug, says researcher – http://bit.ly/aAsXdq
Aug 29, 2010

Google patches 10 Chrome bugs, pays out $10K in bounties – http://bit.ly/bRHRsT
Aug 25, 2010

RT @alissa: To avoid corp. speak like "sync" and "touch base" I am going to start calling my meetings "conspire", "plot", and "fraternize".
Aug 25, 2010

RT @johnhcook: Seattle-based Varolii lays off a portion of its staff, company cites tough economic conditions. http://bit.ly/8Zynmq
Aug 24, 2010

BlackHat Write-up: go-deeper and mining memcaches – http://bit.ly/9v8TC2
Aug 24, 2010

RT @sara_broca: We are Doing #QA All Wrong http://j.mp/aIS6NM #softwaretesting
Aug 24, 2010

RT @unclebobmartin: New blog: "QA, or When do you flip a pancake" http://bit.ly/d1jUwQ
Aug 24, 2010

Virginia Tech’s HokieSpeed supercomputer to rely on CPU and GPU synergies – http://bit.ly/a2oaF5
Aug 23, 2010

RT @mfeathers: Blog: ‘TestNG and What We’d Like Code To Be’ http://bit.ly/a73qE4
Aug 21, 2010

RT @codinghorror: "Go that way, really fast. If something gets in your way, turn." business advice I’ve ever gotten. http://goo.gl/MsUW
Aug 21, 2010

RT @Conenza: Plsd 2 announce Conenza seamlessly integrates w/ Linkedin to offer customers the benefit of transparent access to their profile
Aug 18, 2010

Bill to Combat Comp. Science Crisis Introduced – http://bit.ly/aEHqQC
Aug 16, 2010

RT @garrettgillas: North Korea Joins Twitter [REPORT] http://dlvr.it/3sHQg
Aug 16, 2010

The Testing Planet – July 2010 – http://bit.ly/9yg0bq
Aug 10, 2010

Seattle startup names: verbal bootstrapping – http://bit.ly/bPu3k8
Aug 9, 2010

UK seeks next generation of cyber security specialists – http://bit.ly/ciXrFH
Aug 8, 2010

GitHub Hits One Million Hosted Projects – http://tcrn.ch/abhie5
Aug 6, 2010

Social networking dominates the time Americans spend online – http://bit.ly/cqntjT
Aug 3, 2010

Conenza is looking for a Java developer – “http://www.conenza.com/index.php?option=com_content&task=view&id=83&Itemid=26
Aug 2, 2010

Google executive frustrated by Java, C++ complexity – http://bit.ly/9K10dI
Aug 1, 2010

 

Combine multiple testng-results.xml files into a single XML file

A couple of weeks ago, I realized I needed to combine multiple testng-results.xml files into to do some consolidated reporting. I did some research and came up with a solution that works for me. Recently, the testng-users Google group had a thread that asked the same thing. This post explains how I did it – not necessarily the best way but works for me now.

Basically, I use an XSLT stylesheet to merge the various XML files into a single file. As you will see below, the solution I used only merges 2 files at a time so I create a loop that merges each file into a master file. Let’s start with the master ant task:


...
<taskdef resource="net/sf/antcontrib/antlib.xml"/>
...
<target name="merge-results">
    <delete dir="${report.dir}/testng_summary_report"/>
    <delete file="${report.dir}/start-merge.xml" />
    <delete file="${report.dir}/testng-merge.xml" />

    <mkdir dir="${report.dir}/testng_summary_report"/>
    <copy
        file="empty-testng-results.xml"
        tofile="${report.dir}/testng-merge.xml" />

    <for param="xmlFile">
        <path>
            <fileset dir="${report.dir}" >
                <include name="**/testng-results.xml" />
            </fileset>
        </path>


        <sequential>

            <copy
                file="${report.dir}/testng-merge.xml"
                toFile="${report.dir}/start-merge.xml" />
                <xslt style="testng-merge.xsl"
                    destdir="${report.dir}"
                    in="${report.dir}/start-merge.xml"
                    out="${report.dir}/testng-merge.xml">

                    <param name="with" expression="@{xmlFile}" />
                </xslt>
            <delete file="${report.dir}/start-merge.xml" />
        </sequential>
    </for>
</target>

After some initial cleanup, the ant task copies the "starting" XML file (empty-testng-results.xml). It looks like this:


<?xml version="1.0" encoding="UTF-8"?>
<testng-results>
    <reporter-output>
    </reporter-output>
</testng-results>

The task then uses the antlib for command to loop through all of the testng-results.xml files and applies the XSLT transform to each in turn. I did not write the XSLT stylesheet. I found it at http://www2.informatik.hu-berlin.de/~obecker/XSLT/merge/merge.xslt.html. For convenience, I include it here:


<!--
   Merging two XML files
   Version 1.6
   LGPL (c) Oliver Becker, 2002-07-05
   obecker@informatik.hu-berlin.de
-->
<xslt:transform
    xmlns:xslt="http://www.w3.org/1999/XSL/Transform"
    xmlns:m="http://informatik.hu-berlin.de/merge"
    version="1.0"
    exclude-result-prefixes="m">

<!-- Normalize the contents of text, comment, and processing-instruction
     nodes before comparing?
     Default: yes -->
<xslt:param name="normalize" select="'yes'" />

<!-- Don't merge elements with this (qualified) name -->
<xslt:param name="dontmerge" />

<!-- If set to true, text nodes in file1 will be replaced -->
<xslt:param name="replace" select="false()" />

<!-- Variant 1: Source document looks like
     <?xml version="1.0"?>
     <merge xmlns="http://informatik.hu-berlin.de/merge">
        <file1>file1.xml</file1>
        <file2>file2.xml</file2>
     </merge>         
     The transformation sheet merges file1.xml and file2.xml.
-->
<xslt:template match="m:merge">
   <xslt:variable name="file1" select="string(m:file1)" />
   <xslt:variable name="file2" select="string(m:file2)" />
   <xslt:message>
      <xslt:text />Merging '<xslt:value-of select="$file1" />
      <xslt:text />' and '<xslt:value-of select="$file2" />'<xslt:text />
   </xslt:message>
   <xslt:if test="$file1='' or $file2=''">
      <xslt:message terminate="yes">
         <xslt:text>No files to merge specified</xslt:text>
      </xslt:message>
   </xslt:if>
   <xslt:call-template name="m:merge">
      <xslt:with-param name="nodes1" select="document($file1,/*)/node()" />
      <xslt:with-param name="nodes2" select="document($file2,/*)/node()" />
   </xslt:call-template>
</xslt:template>

<!-- Variant 2:
     The transformation sheet merges the source document with the
     document provided by the parameter "with".
-->
<xslt:param name="with" />

<xslt:template match="*">
   <xslt:message>
      <xslt:text />Merging input with '<xslt:value-of select="$with" />
      <xslt:text>'</xslt:text>
   </xslt:message>
   <xslt:if test="string($with)=''">
      <xslt:message terminate="yes">
         <xslt:text>No input file specified (parameter 'with')</xslt:text>
      </xslt:message>
   </xslt:if>

   <xslt:call-template name="m:merge">
      <xslt:with-param name="nodes1" select="/node()" />
      <xslt:with-param name="nodes2" select="document($with,/*)/node()" />
   </xslt:call-template>
</xslt:template>

<!-- ============================================================== -->

<!-- The "merge" template -->
<xslt:template name="m:merge">
   <xslt:param name="nodes1" />
   <xslt:param name="nodes2" />

   <xslt:choose>
      <!-- Is $nodes1 resp. $nodes2 empty? -->
      <xslt:when test="count($nodes1)=0">
         <xslt:copy-of select="$nodes2" />
      </xslt:when>
      <xslt:when test="count($nodes2)=0">
         <xslt:copy-of select="$nodes1" />
      </xslt:when>

      <xslt:otherwise>
         <!-- Split $nodes1 and $nodes2 -->
         <xslt:variable name="first1" select="$nodes1[1]" />
         <xslt:variable name="rest1" select="$nodes1[position()!=1]" />
         <xslt:variable name="first2" select="$nodes2[1]" />
         <xslt:variable name="rest2" select="$nodes2[position()!=1]" />
         <!-- Determine type of node $first1 -->
         <xslt:variable name="type1">
            <xslt:apply-templates mode="m:detect-type" select="$first1" />
         </xslt:variable>

         <!-- Compare $first1 and $first2 -->
         <xslt:variable name="diff-first">
            <xslt:call-template name="m:compare-nodes">
               <xslt:with-param name="node1" select="$first1" />
               <xslt:with-param name="node2" select="$first2" />
            </xslt:call-template>
         </xslt:variable>

         <xslt:choose>
            <!-- $first1 != $first2 -->
            <xslt:when test="$diff-first='!'">
               <!-- Compare $first1 and $rest2 -->
               <xslt:variable name="diff-rest">
                  <xslt:for-each select="$rest2">
                     <xslt:call-template name="m:compare-nodes">
                        <xslt:with-param name="node1" select="$first1" />
                        <xslt:with-param name="node2" select="." />
                     </xslt:call-template>
                  </xslt:for-each>
               </xslt:variable>
      
               <xslt:choose>
                  <!-- $first1 is in $rest2 and 
                       $first1 is *not* an empty text node  -->
                  <xslt:when test="contains($diff-rest,'=') and not($type1='text' and normalize-space($first1)='')">
                     <!-- determine position of $first1 in $nodes2
                          and copy all preceding nodes of $nodes2 -->
                     <xslt:variable name="pos" select="string-length(substring-before( $diff-rest,'=')) + 2" />
                     <xslt:copy-of select="$nodes2[position() &lt; $pos]" />
                     <!-- merge $first1 with its equivalent node -->
                     <xslt:choose>
                        <!-- Elements: merge -->
                        <xslt:when test="$type1='element'">
                           <xslt:element name="{name($first1)}" namespace="{namespace-uri($first1)}">
                              <xslt:copy-of select="$first1/namespace::*" />
                              <xslt:copy-of select="$first2/namespace::*" />
                              <xslt:copy-of select="$first1/@*" />
                              <xslt:call-template name="m:merge">
                                 <xslt:with-param name="nodes1" select="$first1/node()" />
                                 <xslt:with-param name="nodes2" select="$nodes2[position()=$pos]/node()" />
                              </xslt:call-template>
                           </xslt:element>
                        </xslt:when>
                        <!-- Other: copy -->
                        <xslt:otherwise>
                           <xslt:copy-of select="$first1" />
                        </xslt:otherwise>
                     </xslt:choose>
      
                     <!-- Merge $rest1 and rest of $nodes2 -->
                     <xslt:call-template name="m:merge">
                        <xslt:with-param name="nodes1" select="$rest1" />
                        <xslt:with-param name="nodes2" select="$nodes2[position() &gt; $pos]" />
                     </xslt:call-template>
                  </xslt:when>

                  <!-- $first1 is a text node and replace mode was
                       activated -->
                  <xslt:when test="$type1='text' and $replace">
                     <xslt:call-template name="m:merge">
                        <xslt:with-param name="nodes1" select="$rest1" />
                        <xslt:with-param name="nodes2" select="$nodes2" />
                     </xslt:call-template>
                  </xslt:when>

                  <!-- else: $first1 is not in $rest2 or
                       $first1 is an empty text node -->
                  <xslt:otherwise>
                     <xslt:copy-of select="$first1" />
                     <xslt:call-template name="m:merge">
                        <xslt:with-param name="nodes1" select="$rest1" />
                        <xslt:with-param name="nodes2" select="$nodes2" />
                     </xslt:call-template>
                  </xslt:otherwise>
               </xslt:choose>
            </xslt:when>

            <!-- else: $first1 = $first2 -->
            <xslt:otherwise>
               <xslt:choose>
                  <!-- Elements: merge -->
                  <xslt:when test="$type1='element'">
                     <xslt:element name="{name($first1)}" namespace="{namespace-uri($first1)}">
                        <xslt:copy-of select="$first1/namespace::*" />
                        <xslt:copy-of select="$first2/namespace::*" />
                        <xslt:copy-of select="$first1/@*" />
                        <xslt:call-template name="m:merge">
                           <xslt:with-param name="nodes1" select="$first1/node()" />
                           <xslt:with-param name="nodes2" select="$first2/node()" />
                        </xslt:call-template>
                     </xslt:element>
                  </xslt:when>
                  <!-- Other: copy -->
                  <xslt:otherwise>
                     <xslt:copy-of select="$first1" />
                  </xslt:otherwise>
               </xslt:choose>

               <!-- Merge $rest1 and $rest2 -->
               <xslt:call-template name="m:merge">
                  <xslt:with-param name="nodes1" select="$rest1" />
                  <xslt:with-param name="nodes2" select="$rest2" />
               </xslt:call-template>
            </xslt:otherwise>
         </xslt:choose>
      </xslt:otherwise>
   </xslt:choose>
</xslt:template>

<!-- Comparing single nodes: 
     if $node1 and $node2 are equivalent then the template creates a 
     text node "=" otherwise a text node "!" -->
<xslt:template name="m:compare-nodes">
   <xslt:param name="node1" />
   <xslt:param name="node2" />
   <xslt:variable name="type1">
      <xslt:apply-templates mode="m:detect-type" select="$node1" />
   </xslt:variable>
   <xslt:variable name="type2">
      <xslt:apply-templates mode="m:detect-type" select="$node2" />
   </xslt:variable>

   <xslt:choose>
      <!-- Are $node1 and $node2 element nodes with the same name? -->
      <xslt:when test="$type1='element' and $type2='element' and local-name($node1)=local-name($node2) and namespace-uri($node1)=namespace-uri($node2) and name($node1)!=$dontmerge and name($node2)!=$dontmerge">
         <!-- Comparing the attributes -->
         <xslt:variable name="diff-att">
            <!-- same number ... -->
            <xslt:if test="count($node1/@*)!=count($node2/@*)">.</xslt:if>
            <!-- ... and same name/content -->
            <xslt:for-each select="$node1/@*">
               <xslt:if test="not($node2/@* [local-name()=local-name(current()) and namespace-uri()=namespace-uri(current()) and .=current()])">.</xslt:if>
            </xslt:for-each>
         </xslt:variable>
         <xslt:choose>
            <xslt:when test="string-length($diff-att)!=0">!</xslt:when>
            <xslt:otherwise>=</xslt:otherwise>
         </xslt:choose>
      </xslt:when>

      <!-- Other nodes: test for the same type and content -->
      <xslt:when test="$type1!='element' and $type1=$type2 and name($node1)=name($node2) and ($node1=$node2 or ($normalize='yes' and normalize-space($node1)= normalize-space($node2)))">=</xslt:when>

      <!-- Otherwise: different node types or different name/content -->
      <xslt:otherwise>!</xslt:otherwise>
   </xslt:choose>
</xslt:template>

<!-- Type detection, thanks to M. H. Kay -->
<xslt:template match="*" mode="m:detect-type">element</xslt:template>
<xslt:template match="text()" mode="m:detect-type">text</xslt:template>
<xslt:template match="comment()" mode="m:detect-type">comment</xslt:template>
<xslt:template match="processing-instruction()" mode="m:detect-type">pi</xslt:template>

</xslt:transform>

At the end of this process, the merged results will be found in a file named testng-merge.xml.