title: maven-failsafe-plugin is not executing my integration tests
body: <p>Bellow a part of my actual pom.
  Testng tests for integration tests have been assigned a "integration" group in the @Test annotations.
  To do little test I did not exclude the "integration" group during the test phase.</p>
  
  <p>When building using for example mvn verify or mvn install the integration tests get executed in the test phase, but not the verify or integration-test phase. 
  The number of tests run remains 0. Somehow they are not picked up. Anyone have an idea on what might be wrong?</p>
  
  <pre><code>&lt;plugin&gt;
      &lt;artifactId&gt;maven-surefire-plugin&lt;/artifactId&gt;
      &lt;version&gt;2.12.1&lt;/version&gt;
      &lt;configuration&gt;
        &lt;skip&gt;false&lt;/skip&gt;
      &lt;/configuration&gt;
    &lt;/plugin&gt;
    &lt;plugin&gt;
      &lt;artifactId&gt;maven-failsafe-plugin&lt;/artifactId&gt;
      &lt;version&gt;2.12.1&lt;/version&gt;
      &lt;executions&gt;
        &lt;execution&gt;
          &lt;id&gt;integration-test&lt;/id&gt;
          &lt;phase&gt;integration-test&lt;/phase&gt;
          &lt;goals&gt;
            &lt;goal&gt;integration-test&lt;/goal&gt;
          &lt;/goals&gt;
          &lt;configuration&gt;
            &lt;skip&gt;false&lt;/skip&gt;
            &lt;excludedGroups&gt;unit&lt;/excludedGroups&gt;
          &lt;/configuration&gt;
        &lt;/execution&gt;
        &lt;execution&gt;
          &lt;id&gt;verify&lt;/id&gt;
          &lt;phase&gt;verify&lt;/phase&gt;
          &lt;goals&gt;
            &lt;goal&gt;verify&lt;/goal&gt;
          &lt;/goals&gt;
          &lt;configuration&gt;
            &lt;skip&gt;false&lt;/skip&gt;
            &lt;excludedGroups&gt;unit&lt;/excludedGroups&gt;
          &lt;/configuration&gt;
        &lt;/execution&gt;
      &lt;/executions&gt;
      &lt;configuration&gt;
        &lt;skip&gt;false&lt;/skip&gt;
        &lt;excludedGroups&gt;unit&lt;/excludedGroups&gt;
      &lt;/configuration&gt;
    &lt;/plugin&gt;
  </code></pre>
  
  <blockquote>
    <p>Update: Adding TestNG as a dependency to the failsafe plugin does not
    help</p>
  </blockquote>