Adds DFs, Updates rspec behaviour regarding --fail-fast

spec/spec_helper.rb

@@ -16,6 +16,9 @@ RSpec.configure do |config|
   config.expect_with :rspec do |c|
     c.syntax = :expect
   end
+
+  # For --only-failures / --next-failure
+  config.example_status_persistence_file_path = '/tmp/rspec_examples.txt'
 end
 
 def redefine_constant(constant, value)