Another testing tool, RSpec, emerged in the Ruby community in 2007 and was a refinement on test-driven development. It featured behavior driven development (BDD). The phpspec tool, which brought ported RSpec's BDD to PHP, is growing rapidly in popularity. Its co-creator, Marcello Duarte, repeatedly states that "BDD is TDD done right". Therefore, BDD is simply an improvement or evolution of TDD. Laravel 5 now cleverly includes phpspec as a way to accentuate the design by specification paradigm of behavior-driven development.

Since an essential step in building a Laravel 5 application is to specify which entities to create, after installing and configuring Laravel 5, the developer may immediately start designing by running phpspec as a design tool.