Reuse feature check methods

Author: benoittgt

lib/rspec/rails/configuration.rb

@@ -135,19 +135,19 @@ def filter_rails_from_backtrace!
         end
       end
 
-      if defined?(ActionMailer)
+      if RSpec::Rails::FeatureCheck.has_action_mailer?
         config.include RSpec::Rails::MailerExampleGroup, :type => :mailer
       end
 
-      if defined?(ActiveJob)
+      if RSpec::Rails::FeatureCheck.has_active_job?
         config.include RSpec::Rails::JobExampleGroup, :type => :job
       end
 
-      if defined?(ActionCable) && ::Rails::VERSION::STRING > '6'
+      if RSpec::Rails::FeatureCheck.has_action_cable_testing?
         config.include RSpec::Rails::ChannelExampleGroup, :type => :channel
       end
 
-      if defined?(ActionMailbox)
+      if RSpec::Rails::FeatureCheck.has_action_mailbox?
         config.include RSpec::Rails::MailboxExampleGroup, :type => :mailbox
       end
     end

lib/rspec/rails/example/channel_example_group.rb

@@ -15,7 +15,7 @@ module ClassMethods
   end
 end
 
-if ::Rails::VERSION::MAJOR >= 6
+if RSpec::Rails::FeatureCheck.has_action_cable_testing?
   module RSpec
     module Rails
       # @api public