title: maven: Unrecognised tag: 'testResources'
body: <p>When I run mvn resources:testResources i obtain </p>
  
  <pre><code>Non-parseable POM /home/ernst/Software/pom.xml: Unrecognised tag: 'testResources' 
  </code></pre>
  
  <p>The problem seems </p>
  
  <pre><code>&lt;build&gt;
  &lt;resources&gt;
    &lt;resource&gt;
  &lt;directory&gt;${resourceDir}&lt;/directory&gt;
  &lt;filtering&gt;true&lt;/filtering&gt;
  &lt;includes&gt;
    &lt;!--include&gt;octave/m/java-arithmetics/**/*.m&lt;/include--&gt;
    &lt;include&gt;octave/octaverc&lt;/include&gt;
    &lt;include&gt;octave/java.opts&lt;/include&gt;
  &lt;/includes&gt;
    &lt;/resource&gt;
  &lt;/resources&gt;
  
  &lt;testResources&gt;
    &lt;testResource&gt;
  &lt;directory&gt;${tstResourcesDir}&lt;/directory&gt;
      &lt;filtering&gt;true&lt;/filtering&gt;
      &lt;includes&gt;
       &lt;include&gt;*.rml&lt;/include&gt;
  &lt;/includes&gt;
    &lt;/testResource&gt;
  &lt;testResources&gt;
  
  &lt;plugins&gt;
  </code></pre>
  
  <p>As long as I had only the tag resources, all was fine. 
  Now that i added testResources, i have the problem. 
  The resources plugin is configured as follows: </p>
  
  <pre><code>&lt;plugins&gt;
   &lt;plugin&gt;
  &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
      &lt;artifactId&gt;maven-resources-plugin&lt;/artifactId&gt;
      &lt;version&gt;3.0.2&lt;/version&gt;
  &lt;configuration&gt;
    &lt;escapeString&gt;\&lt;/escapeString&gt; &lt;!-- \${java.home} -&gt; ${java.home} --&gt;
        &lt;!--nonFilteredFileExtensions&gt;
          &lt;nonFilteredFileExtension&gt;pdf&lt;/nonFilteredFileExtension&gt;
        &lt;/nonFilteredFileExtensions--&gt;
    &lt;!--outputDirectory&gt;${basedir}/target/&lt;/outputDirectory--&gt;
  &lt;/configuration&gt;
    &lt;/plugin&gt;
  </code></pre>
  
  <p>I have the impression, that this problem is about maven itself 
  not about the resources plugin, right? 
  I use maven 3.5.0. </p>