Grouped

.idea/inspectionProfiles/Project_Default.xml

@@ -0,0 +1,14 @@
+<component name="InspectionProjectProfileManager">
+  <profile version="1.0">
+    <option name="myName" value="Project Default" />
+    <inspection_tool class="groupsTestNG" enabled="true" level="WARNING" enabled_by_default="true">
+      <option name="groups">
+        <value>
+          <list size="1">
+            <item index="0" class="java.lang.String" itemvalue="Smoke" />
+          </list>
+        </value>
+      </option>
+    </inspection_tool>
+  </profile>
+</component>

src/test/java/zacksolutions/TestHomePage.java

@@ -5,7 +5,7 @@ import org.testng.annotations.Test;
 
 public class TestHomePage {
 
-    @Test
+  @Test(groups = { "Smoke" })
   public static void testCaseSixteen() {
     System.out.println("Debug the sixteenth case");
   }

src/test/java/zacksolutions/TestLoginPage.java

@@ -8,7 +8,7 @@ public class TestLoginPage {
     System.out.println("Debug the eleventh case");
   }
 
-    @Test
+  @Test(groups = { "Smoke" })
   public static void testCaseTwelve() {
     System.out.println("Debug the twelfth case");
   }

src/test/java/zacksolutions/TestNGClass.java

@@ -5,14 +5,15 @@ import org.testng.annotations.Test;
 
 public class TestNGClass {
   @AfterTest
-    public static void testCaseOne(){
+  public static void testCaseOne() {
     System.out.println("Debug the firtst case ### AFTER TEST ###");
   }
 
-    @Test
-    public void testCaseTwo(){
+  @Test(groups = { "Smoke" })
+  public void testCaseTwo() {
     System.out.println("Debugging the second case");
   }
+
   @Test
   public static void testCaseThree() {
     System.out.println("Debug the third case");

src/test/java/zacksolutions/TestNGDiffClass.java

@@ -4,9 +4,10 @@ import org.testng.annotations.Test;
 
 public class TestNGDiffClass {
   @Test
-    public void testCaseSix(){
+  public void testCaseSix() {
     System.out.println("Debug the sixteenth case");
   }
+
   @Test
   public static void testCaseSeven() {
     System.out.println("Debug the seventh case");
@@ -22,7 +23,7 @@ public class TestNGDiffClass {
     System.out.println("Debug the ninth case");
   }
 
-    @Test
+  @Test(groups = { "Smoke" })
   public static void testCaseTen() {
     System.out.println("Debug the tenth case");
   }

testngGroups.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
+<suite name="All Test Suite">
+    <test name="RegressionTest">
+        <groups>
+            <run>
+                <include name="Smoke"/>
+            </run>
+        </groups>
+        <classes>
+            <class name="zacksolutions.TestNGDiffClass">
+            </class>
+            <class name="zacksolutions.TestHomePage">
+            </class>
+            <class name="zacksolutions.TestNGClass">
+            </class>
+            <class name="zacksolutions.TestLoginPage">
+            </class>
+        </classes>
+    </test>
+</suite>