rails/rails — pull request #6627 by Vanuan (2012-06-04 22:56:07+00:00)
Title: bundle exec rake assets:precompile shouldn't fail quietly.

If JavaScript runtime is not installed, execjs fails with error quietly,
while tests continue to run. This should not happen since it causes tests
to fail for unknown reason (#6621).

This commit assures that if JavaScript runtime is not installed, an assertion
is raised.