testing.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">

<suite name="TestSuite" thread-count="2" parallel="tests" >

    <test name="ChromeTest">
        <parameter name="browser" value="Chrome" />
        <classes>
            <class name="selenium.CrossBrowser">
            </class>
        </classes>
    </test>

    <test name="EdgeTest">
        <parameter name="browser" value="Edge" />
        <classes>
            <class name="selenium.CrossBrowser">
            </class>
        </classes>
    </test>

</suite>