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    copied!<p>I have a doubt about what you are trying to do but but I'll assume you want to reuse the tests that you have created for a project (module1) in another. As explained in the note at the bottom of the <a href="http://maven.apache.org/guides/mini/guide-attached-tests.html" rel="noreferrer">Guide to using attached tests</a>:</p> <blockquote> <p>Note that previous editions of this guide suggested to use <code>&lt;classifier&gt;tests&lt;/classifier&gt;</code> instead of <code>&lt;type&gt;test-jar&lt;/type&gt;</code>. While this currently works for some cases, it does not properly work during a reactor build of the test JAR module and any consumer if a lifecycle phase prior to install is invoked. In such a scenario, Maven will not resolve the test JAR from the output of the reactor build but from the local/remote repository. Apparently, the JAR from the repositories could be outdated or completely missing, causing a build failure (cf. <a href="http://jira.codehaus.org/browse/MNG-2045" rel="noreferrer">MNG-2045</a>).</p> </blockquote> <p>So, first, to package up compiled tests in a JAR and deploy them for general reuse, configure the <code>maven-jar-plugin</code> as follows:</p> <pre><code>&lt;project&gt; &lt;build&gt; &lt;plugins&gt; &lt;plugin&gt; &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt; &lt;artifactId&gt;maven-jar-plugin&lt;/artifactId&gt; &lt;version&gt;2.2&lt;/version&gt; &lt;executions&gt; &lt;execution&gt; &lt;goals&gt; &lt;goal&gt;test-jar&lt;/goal&gt; &lt;/goals&gt; &lt;/execution&gt; &lt;/executions&gt; &lt;/plugin&gt; &lt;/plugins&gt; &lt;/build&gt; &lt;/project&gt; </code></pre> <p>Then, install/deploy the test JAR artifact as usual (using <code>mvn install</code> or <code>mvn deploy</code>).</p> <p>Finally, to use the test JAR, you should specify a dependency with a specified type of <code>test-jar</code>:</p> <pre><code>&lt;project&gt; ... &lt;dependencies&gt; &lt;dependency&gt; &lt;groupId&gt;com.myco.app&lt;/groupId&gt; &lt;artifactId&gt;foo&lt;/artifactId&gt; &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt; &lt;type&gt;test-jar&lt;/type&gt; &lt;scope&gt;test&lt;/scope&gt; &lt;/dependency&gt; &lt;/dependencies&gt; ... &lt;/project&gt; </code></pre>
 

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