TestNG Tutorial

TestNG Introduction:-

  • TestNG is a unit test framework designed for testing needs (developers / Test Engineers).


  • TestNG is an open-source test automation framework, where NG stands for Next Generation.


  • TestNG inspired from Junit and Nuit but introduced some new functionalities, that made TestNG is more powerfull than Junit and Nuint frameworks.


  • It is designed to cover all categories of tests – Unit, functional, end-to-end, integration, regression, retesting, etc.


  • TestNG allows users to do test configuration through XML files and allows them to include (or exclude) respective packages, classes, and methods in their test suite.


  • WebDriver has no native mechanism for generating reports.
  • TestNG can generate reports based on our Selenium test results.
  • TestNG can generate the report in a readable format.
  • There is no more need for a static main method in our tests. 
  • The sequence of actions is regulated by easy-to-understand annotations that do not require methods to be static.
  • Uncaught exceptions are automatically handled by TestNG without terminating the test prematurely and These exceptions are reported as failed steps in the report.

Advantages / Benefits of TestNG Framework:-

  • It is easier to use.
  • It is supported by a variety of tools and plug-ins (Eclipse, IDEA, NetBeans, Maven, etc…)
  • Flexible test configuration.
  • It generates HTML test reports.
  • Support for data-driven testing (with @DataProvider).
  • Support for parameters.
  • Support for multi threaded testing.
  • Supports testing integrated classes (e.g., by default, no need to create a new test class instance for every test method).
  • TestNG Annotations are easy to create Test cases.
  • Test cases can be grouped and prioritized more easily.
  • Parlell TestNG is possible.
  • Parameterization is possible.
  • We can execute the test cases in the order which we provide using priority.
  • We can run classes without using the Main method.
  • Default JDK functions for runtime and logging (no dependencies).
  • To read the data from Excel file.
  • Supports Dependent test methods is possible.
  • Embeds BeanShell for further flexibility.
  • TestNG is designed to cover all categories of tests: unit, functional, end-to-end, integration, etc, etc..
  • Supports testing integrated classes (e.g., by default, no need to create a new test class instance for every test method).
  • Supported more/different Annotations.

TestNG Annotations :-​

1) @Test 
2) @BeforeSuite 
3) @AfterSuite 
4) @BeforeClass
5) @AfterClass 
6) @BeforeTest 
7) @AfterTest
8) @BeforeGroups 
9) @AfterGroups 

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