How to run a specific test in testng

I am trying to run a unique test from testng.xml.My testng.xml is as below:

<suite name="Suite">
    <test name="one">
  <parameter name="browser" value="firefox"/>
  <parameter name="os" value="win"/>
    <classes>
      <class name="com.snapdeal.qa.Tests.MyAccount.SignUpTest"/>
    </classes>
  </test>
  <test name="two">
  <parameter name="browser" value="chrome"/>
  <parameter name="os" value="win"/>
    <classes>
      <class name="com.snapdeal.qa.Tests.MyAccount.BaseTest"/>
      <class name="com.snapdeal.qa.Tests.MyAccount.SignUpTest"/>
    </classes>
  </test>
</suite>

I am using maven and i am passing which test to run through sure-fire like this: test -Dtests="one" But its running all tests defined in testng.Where is actually i am wrong. and how to run a specfic test like this in any way