Can't Run Module Acceptance Test

I am trying to write tests for puppetlabs-apache (so that my pull request can be accepted). When I run bundle exec rspec spec/acceptance as the documentation says, I get an error facter: command not found. I think I followed all the setup instructions, but I can't run the tests.

This is the error (repeated multiple times):

Failure/Error: install_bolt_on(hosts) unless pe_install?
Beaker::Host::CommandFailure:
Host 'ubuntu-1404-x64' exited with 127 running:
facter --json "osfamily"
Last 10 lines of output were: