here is my TestNG.xml file..please let me know if anything went wrong.
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "
http://testng.org/testng-1.0.dtd">
<suite name="Default suite" thread-count="4" parallel="tests">
<test name="Nexus" >
<Parameters>
<parameter name="platform" value="Nexus"></parameter>
<parameter name="browsername" value="Android"></parameter>
<parameter name="remoteurl" value="http://0.0.0.0:4723/wd/hub"></parameter>
</Parameters>
<classes>
<class name="AppiumTest">
<methods>
<include name="Test1"></include>
<include name="Test2"></include>
<include name="Test3"></include>
</methods>
</class>
</classes>
</test>
<test name="Moto E" >
<Parameters>
<parameter name="platform" value="Moto E"></parameter>
<parameter name="browsername" value="Android"></parameter>
<parameter name="remoteurl" value="http://0.0.0.0:4726/wd/hub"></parameter>
</Parameters>
<classes>
<class name="AppiumTest">
<methods>
<include name="Test1"></include>
<include name="Test2"></include>
<include name="Test3"></include>
</methods>
</class>
</classes>
</test>
</suite>