gulp-mocha simplifies running Mocha unit tests within your Gulp build process. It streamlines test execution, allowing for seamless integration into development workflows. By utilizing streams, it efficiently handles test files and reports results. Configuration options, such as reporters and compilers, are easily customized via Mocha's familiar interface, enabling tailored testing setups. This plugin simplifies the process of incorporating robust testing into Gulp-based projects, ensuring consistent code quality and early bug detection.