Custom matchers Show archive.org snapshot are a useful RSpec feature which you can use to DRY up repetitive expectations in your specs. Unfortunately the default directory structure generated by rspec-rails has no obvious place to put custom matchers or other support code.

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I recommend storing them like this:

spec/support/database_cleaner.rb
spec/support/devise.rb
spec/support/factory_bot.rb
spec/support/vcr.rb
spec/support/matchers/be_allowed_access.rb
spec/support/matchers/be_denied_access.rb
spec/support/matchers/be_same_second_as.rb

To make this support code available to all specs, put the following into your spec_helper.rb, above the RSpec.configure block:

Dir[Rails.root.join("spec/support/**/*.rb")].sort.each {|f| require f}

Also see where to put shared example groups.