lab-babel is a small transform to allow testing your es6/jsx modules with lab, complete with code coverage and proper source maps.
lab -T node_modules/lab-babel -t 100 -S
Any module (that is not in node_modules) required via your tests with an extension of .js, .jsx, .es, or .es6 will be transpiled with babel and have sourcemaps inlined so that lab can show appropriate line numbers.
For more information on writing tests in lab, see the README.