Working with TestNG - Starters Guide

Annotations are keywords which are used in TestNG code which gives information about test methods  which methods are going to run before & after test methods or test will be ignore during execution.

Here is a quick overview of some of the annotations available in TestNG along with their attributes.

Data source: TestNG Docs 

 @Test

 This annotation identifies the following method as test method.

 @BeforeTest

Method which is annotated as “@BeforeTest” sothis method is executed before each test annotation method is executing. It is basically used to prepare test environment, initializing, resources etc.

 @AfterTest

Method which is annotated as “@AfterTest” so this method is executed after each test annotation method is executed. It is basically used for clean-up/un initializing the resources/releasing.

 @BeforeMethod

Method which is annotated as “@BeforeMethod” will be run before each and every test method.

 @AfterMethod

Method which is annotated as “@AfterMethod” will be run after each and every test method.

 @BeforeClass

Method which is annotated as “@BeforeClass” so this method is executed only once before executing all the test annotation methods executed. This method needs to be defined as “static”

 @AfterClass

Method which is annotated as “@AfterClass” so this method is executed only once after executing all the test annotation methods executed. This method needs to be defined as “static”

 @BeforeSuite

Method which is annotated as “@BeforeSuite” so this method will be run only once before all tests in this suiterun

 @AfterSuite

Method which is annotated as “@AfterSuite” so this method will be run only once after all tests in this suite have run completely.

 @BeforeGroups

This method is run before the first test method that belongs to any groups is invoked.

 @AfterGroups

This method is run after the all test methods that belongs to groups is executed completely.

 @Factory

If a method is annotated as a factory, returns objects that will be used by TestNG as Test classes.

 @DataProvider

If a method is annotated as DataProvider, It Marks it as supplying data for a test method.

 @Parameters

This annotated method used to pass parameters to a @Test method.           

 @Listeners

This annotated method used to define the listeners on a test class. 

Annotations - What are they good for:

• It allows user to pass additional parameters to annotations.
• Annotations are in-built keywords if any mistake in keywords, the compiler will give errorright away.
• There is no restriction on TestNGmethod names format.