title: How to run test classes one by one inside <test> tag using maven
body: <p>I have below testng xml but its not working. Every time running by maven it strat execution on three browsers. I want to run all classes one by one.</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  </code></pre>
  
  <p>
  </p>
  
  <pre><code>&lt;parameter name="browser" value="${browser}" /&gt;
  &lt;parameter name="execution" value="${execution}" /&gt;
  
  &lt;test name="POC Test" preserve-order="true" thread-count="1" &gt;
      &lt;classes&gt;
          &lt;class name="com.testscript.OurPurposeTest" /&gt;
          &lt;class name="com.testscript.ContactUsTest" /&gt;
          &lt;!-- &lt;class name="com.testscript.ChevronTest" /&gt; --&gt;
          &lt;class name="com.testscript.SearchTest" /&gt;
          &lt;class name="com.testscript.FinancialRegulatoryReportsTest" /&gt;
          &lt;class name="com.testscript.CompanyHistoryTest" /&gt;
          &lt;class name="com.testscript.HomePageTest" /&gt;
      &lt;/classes&gt;
  &lt;/test&gt; &lt;!-- POC Test --&gt;
  </code></pre>
  
  <p> </p>
  
  <pre><code>&lt;plugin&gt;
              &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
              &lt;artifactId&gt;maven-surefire-plugin&lt;/artifactId&gt;
              &lt;version&gt;2.9&lt;/version&gt;
              &lt;configuration&gt;
                  &lt;suiteXmlFiles&gt;
                      &lt;suiteXmlFile&gt;${suiteXmlFile}&lt;/suiteXmlFile&gt;
                  &lt;/suiteXmlFiles&gt;
              &lt;/configuration&gt;
  
          &lt;/plugin&gt;
  </code></pre>