Rails spec test error, no password supplied

I have an existing project, with created many years ago. No one at out company has succeeded in running them. I have updated files to fit the latest rails version but when I run bundle exec rspec spec/models/promo_code_spec.rb,

I get

   /Users/mmiller/.rvm/gems/ruby-2.1.6@global/gems/activerecord-4.1.9/lib/active_record/connection_adapters/postgresql_adapter.rb:888:in `initialize': fe_sendauth: no password supplied (PG::ConnectionBad)

I have followed these steps in this post: fe_sendauth: no password supplied but still getting the same error. Any advice on how to resolve this issue?