Effective Testing with RSpec 3

Using rspec-rails

Once rspec-rails is installed, you’ll be able to run your spec suite using either bundle exec rspec or bin/rake spec. Commands in the bin directory, like rake or rails, are Rails-generated binstubs (wrapper scripts) that save you the hassle of remembering to type bundle exec before every command.^[127]

If you’re used to creating binstubs via Bundler’s --binstubs option as described in ​Bundler​, be aware that this option may not play nicely with Spring, a Rails preloader designed to speed up boot times.^[128] You may see Rails commands hang or print warning messages from the Bundler-generated binstubs. To solve the problem, you’ll need to either remove Spring or switch to the binstubs provided by Rails:

$ bundle config --delete ...