How to use groups in testNG - selenium

Question

I am implementing groups in the testng test suite.When I run my testng suite suite,it runs only the 'FireFox' test and when I put the tag in 'Firefox' test
it runs the 'IE' test.Kindly let me know what can be the reason for this??
<groups>
<run>
<include = "smoke"/>
</run>
</groups>
<classes>
<class name = "com.asw.beginner.tests.NewTest"/>
</classes>
</test>
<test name = "FireFox" allow-return-values = "true">
<parameter name = "browser" value = "FF"/>
<classes>
<class name = "com.asw.beginner.tests.NewTest"/>
</classes>
</test>

Answer 1

Define your test as following:
public class Test1 {
#Test(groups = { "functest" })
public void testMethod1() {
}
#Test(groups = {"functest", "checkintest"} )
public void testMethod2() {
}
#Test(groups = { "checkintest" })
public void testMethod3() {
}
}
Then you can use xml file as following
<test name="Test1">
<groups>
<run>
<include name="functest"/>
</run>
</groups>
<classes>
<class name="example1.Test1"/>
</classes>
</test>
Above test will only run the method with group functest.
You can read more about testng from Official testng documatation

Answer 2

Following is example java code
import org.testng.Assert; import org.testng.annotations.Test;
public class GroupTestExample { String message = ".com"; MessageUtil messageUtil = new MessageUtil(message);
#Test(groups = { "functest", "checkintest" })
public void testPrintMessage() {
System.out.println("Inside testPrintMessage()");
message = ".com";
Assert.assertEquals(message, messageUtil.printMessage()); }
#Test(groups = { "checkintest" })
public void testSalutationMessage() {
System.out.println("Inside testSalutationMessage()");
message = "tutorialspoint" + ".com";
Assert.assertEquals(message, messageUtil.salutationMessage()); }
#Test(groups = { "functest" })
public void testingExitMessage() {
System.out.println("Inside testExitMessage()");
message = "www." + "tutorialspoint"+".com";
Assert.assertEquals(message, messageUtil.exitMessage()); } }
following is Testng.xml file
<groups>
<run>
<include name = "functest" />
</run>
</groups>
<classes>
<class name = "GroupTestExample" />
</classes>
</test> </suite>