Install parallel_tests gem

Gemfile

@@ -22,6 +22,7 @@ gem 'dotenv-rails'
 gem 'react-rails'
 gem 'react-rails-hot-loader'
 group :development do
+  gem 'parallel_tests', group: :development
   gem 'better_errors'
   gem 'rubocop', require: false
   gem 'haml-lint', require: false

Gemfile.lock

@@ -209,6 +209,9 @@ GEM
       nenv (~> 0.1)
       shellany (~> 0.0)
     orm_adapter (0.5.0)
+    parallel (1.6.1)
+    parallel_tests (2.2.1)
+      parallel
     parser (2.3.0.5)
       ast (~> 2.2)
     pg (0.18.4)
@@ -415,6 +418,7 @@ DEPENDENCIES
   jquery-rails
   launchy
   newrelic_rpm
+  parallel_tests
   pg
   poltergeist
   pry-rails

Guardfile

@@ -50,7 +50,16 @@ end
 #  * zeus: 'zeus rspec' (requires the server to be started separately)
 #  * 'just' rspec: 'rspec'
 
-guard :rspec, cmd: "bundle exec spring rspec", all_after_pass: false do#, failed_mode: :focus 
+rspec_options = {
+  cmd: "bundle exec spring rspec",
+  all_after_pass: false,
+  failed_mode: :focus,
+  run_all: {
+    cmd: "bundle exec parallel_rspec -o '",
+    cmd_additional_args: "'"
+  }
+}
+guard :rspec, rspec_options do #, failed_mode: :focus 
   require "guard/rspec/dsl"
   dsl = Guard::RSpec::Dsl.new(self)
   notification :off