How many different listeners are available in TestNG?

As an experienced automation testing coach registered on UrbanPro.com, I'm pleased to provide insights into the various TestNG listeners, essential for effective test automation. These listeners play a crucial role in enhancing the testing experience and facilitating comprehensive reporting.

TestNG Listeners Overview

TestNG provides a variety of listeners that enable you to customize and control the test execution process. Here are the key listeners:

1. IAnnotationTransformer

• Modifies annotations of test classes and methods during runtime.
• Useful for dynamically changing test behavior based on specific conditions.

2. IAnnotationTransformer2

• Extends IAnnotationTransformer, allowing more advanced transformations.
• Provides additional methods for modifying annotations.

3. IConfigurable

• Allows you to configure test instances programmatically.
• Useful for setting custom configurations before test execution.

4. IConfigurationListener

• Listens to configuration methods (e.g., @BeforeSuite, @AfterSuite) events.
• Enables custom actions before and after the execution of suite-level configurations.

5. IExecutionListener

• Executes methods before and after the execution of the entire suite.
• Useful for tasks such as setting up and tearing down resources globally.

6. IInvokedMethodListener

• Listens to individual test method invocation events.
• Useful for performing actions before and after each test method execution.

7. IInvokedMethodListener2

• Extends IInvokedMethodListener, providing additional methods for more advanced method-level listening.

8. IReporter

• Generates test reports.
• Allows you to customize the reporting format and content.

9. ITestListener

• Listens to test-level events, such as test start, test success, failure, and skip.
• Useful for capturing and reporting test execution details.

10. ITestNGListener

• The base interface for all TestNG listeners.

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Conclusion

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