rspec_spinner Show archive.org snapshot is a progress bar for RSpec which outputs failing examples as they happen (instead of all at the end).
gem install rspec_spinner
script/spec -r rspec_spinner -f RspecSpinner::Bar -c
alias ss='script/spec -r rspec_spinner -f RspecSpinner::Bar -c'
There's also an alternate runner RSpecSpinner::Spinner
which shows a spinner and the name of the current spec instead of a progress bar.