Check out a free preview of the full Front-End Tooling and Workflows with Grunt and Beyond course:
The "Lineman Spec and Build" Lesson is part of the full, Front-End Tooling and Workflows with Grunt and Beyond course featured in this preview video. Here's what you'd learn in this lesson:
Lineman-spec kicks off a test runner. This happens in parallel with Lineman-run. Any tests in the spec folder would execute. Lineman-build generates the production-ready assets. Dave also overviews the scaffolding that ships with Lineman.