On the Codeception site today there's a new post that compares their tool, Behat and PHPUnit for testing your applications.
This is guest post by Ragazzo. He uses Behat as well as Codeception for making his project better. He was often asked to do a comparison between Codeception, Behat, and PhpUnit. In this post he explains the commons and different parts of this products.
The author talks some about the difference between functional/acceptance tests and how they fit in with behavior driven development. He includes some examples of Behat test formats (Gherkin) and how it can be used for both the functional and acceptance side of things. He also talks some about why he prefers Codeception over Behat(+Mink) for his testing. A sample Codeception test is included, showing a login form check.