testng-data-driven

Data-driven testing in TestNG uses DataProviders to execute a single test method against multiple input combinations. A DataProvider is a method that returns an array of objects, each representing one test case. TestNG automatically runs your test once for each data set, enabling comprehensive coverage without duplicating test code.

DataProviders supply test data programmatically from Java code or external sources, offering flexibility and type safety. Parameterization uses XML configuration to inject values directly into tests. DataProviders scale better for complex data sets and support dynamic data generation, while XML parameterization suits simple, static configurations.

Yes. Factory patterns and DataProviders complement each other in TestNG. Factories dynamically create test instances at runtime, while DataProviders feed multiple data sets to those instances. Together they enable data-driven test class instantiation and method-level parameterization for comprehensive test coverage.

DataProviders can retrieve data from external sources like CSV files, databases, or APIs by parsing the source in your provider method and returning the formatted data array. This decouples test data from test code and enables managing large data sets outside your test suite.

Yes. TestNG allows parallel execution at the method and class level, including tests driven by DataProviders. Configure parallel execution in your TestNG XML file, and DataProvider-driven tests will run concurrently across available threads, reducing overall test execution time.

Method-scoped DataProviders supply data to a single test method only. Class-scoped DataProviders share a data set across multiple test methods in the same class. Class-scoped providers reduce redundancy when multiple tests consume the same data, improving maintainability and resource efficiency.