What is the function of a test runner in automation testing?

The function of a test runner in automation testing primarily revolves around executing test scripts and reporting the outcomes. A test runner is a crucial component in the testing framework that facilitates the automation process by managing the execution of test cases. It takes the written test scripts, runs them against the application under test, and then collects and reports the results. This includes success, failure, and any error messages that may have occurred during the test execution.

By providing a systematic way to run tests, a test runner ensures consistency and efficiency in the testing process. It can often handle multiple test scripts at once and may also support features like parallel execution and setup/teardown processes, making it an essential tool for developers and testers looking to maintain high-quality code through automation.

Other functions mentioned in the options, such as drafting test documentation, analyzing performance of testing tools, or creating testing environments, do not align with the core responsibilities of a test runner. These tasks are handled by different roles or tools in the testing ecosystem, thus distinguishing the role of a test runner as primarily focused on executing tests and reporting their outcomes.