Ever have this error occur when working with tests in Ruby?

Expected block to return true value

Not very descriptive is it? This post by Deryl Doucette explains that there was a regression introduced to Ruby 1.9.2 between p136 and p188.

To resolve this, simply update your Ruby:

rvm install ruby-1.9.2-head

Or for patched awesomeness:

curl https://raw.github.com/gist/1008945/4edd1e1dcc1f0db52d4816843a9d1e6b60661122/ruby-1.9.2p290.patch > /tmp/require-performance-fix.patch
rvm install ruby-1.9.2-p290 --patch /tmp/require-performance-fix.patch -n patched