TestNG: @BeforeClass: Execute this method before executing test cases

If you want to execute specific snippet of code exactly once before executing test cases, then put that code in a method that is annotated with @BeforeClass annotation.

@BeforeClass

public void beforeClass_1() {

         System.out.println("Inside before class 1");

}

BeforeClassTest.java

package com.sample.app.arithmetic;

import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;

public class BeforeClassTest {

 @BeforeClass
 public void beforeClass_1() {
  System.out.println("Inside before class 1");
 }

 @Test
 public void testCase1() {
  System.out.println("testCase1 executing");
 }

 @Test
 public void testCase2() {
  System.out.println("testCase2 executing");
 }

}

When you run BeforeClassTest application, you will see below messages in console.

Inside before class 1
testCase1 executing
testCase2 executing

Can I have more than one method annotated with @BeforeClass annotation?

Yes

package com.sample.app.arithmetic;

import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;

public class BeforeClassTest {

 @BeforeClass
 public void beforeClass_1() {
  System.out.println("Inside before class 1");
 }
 
 @BeforeClass
 public void beforeClass_2() {
  System.out.println("Inside before class 2");
 }

 @Test
 public void testCase1() {
  System.out.println("testCase1 executing");
 }

 @Test
 public void testCase2() {
  System.out.println("testCase2 executing");
 }

}

When you ran ‘BeforeClassTest’, you will get below messages in console.

Inside before class 1
Inside before class 2
testCase1 executing
testCase2 executing

Where can I use @BeforeClass methods?

Following are some of the examples.

a.   Driver initialization in selenium testing

b.   Data base connections initialization

c.    Profiles setting etc.,

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