gotest.tools

Each package like assert, golden, or fs operates independently without pulling in unnecessary dependencies, aligning with Go's simplicity and allowing incremental adoption.

The golden package enables comparing large multi-line outputs against stored files, ideal for CLI tool testing and preventing regression with easy updates via flags.

env package provides isolated setting and cleanup of environment variables, ensuring test reproducibility and preventing side effects across tests.

poll package offers utilities to test async code by polling for state changes, useful for integration tests with external systems or delayed responses.