babel-helper-transform-fixture-test-runner is a utility package designed to simplify testing Babel transformations. It iterates through fixture directories, applying a Babel transformation to the input files within, and compares the output with expected results. This helper reduces boilerplate code for Babel plugin authors, ensuring consistent and reliable testing across transformations and test suites. It streamlines the process of verifying Babel plugin functionality by automating the input/output comparison.