Introduce SimpleCovEnv singleton helper and use it

features/support/env.rb

-require_relative '../../spec/simplecov_env'
-SimpleCov.start if ENV['SIMPLECOV']
+require './spec/simplecov_env'
+SimpleCovEnv.start!
 
 ENV['RAILS_ENV'] = 'test'
 require './config/environment'

scripts/merge-simplecov

 #!/usr/bin/env ruby
 
-require 'simplecov'
+require_relative '../spec/simplecov_env'
+SimpleCovEnv.configure_profile
 
 module SimpleCov
   module ResultMerger
@@ -26,10 +27,4 @@ module SimpleCov
   end
 end
 
-# Ignore CI environment
-ENV['CI'] = nil
-ENV['CI_BUILD_NAME'] = nil
-
-require_relative '../spec/simplecov_env'
-
 SimpleCov::ResultMerger.merged_result.format!

spec/simplecov_env.rb

 require 'simplecov'
 
-SimpleCov.configure do
-  load_profile 'test_frameworks'
-  track_files '{app,lib}/**/*.rb'
+module SimpleCovEnv
+  extend self
 
-  if ENV['CI_BUILD_NAME']
-    coverage_dir "coverage/#{ENV['CI_BUILD_NAME']}"
-    command_name ENV['CI_BUILD_NAME']
+  def start!
+    return unless ENV['SIMPLECOV']
+
+    configure_profile
+    configure_job
+
+    SimpleCov.start
   end
 
-  if ENV['CI']
-    SimpleCov.at_exit do
-      # In CI environment don't generate formatted reports
-      # Only generate .resultset.json
-      SimpleCov.result
+  def configure_job
+    SimpleCov.configure do
+      if ENV['CI_BUILD_NAME']
+        coverage_dir "coverage/#{ENV['CI_BUILD_NAME']}"
+        command_name ENV['CI_BUILD_NAME']
+      end
+
+      if ENV['CI']
+        SimpleCov.at_exit do
+          # In CI environment don't generate formatted reports
+          # Only generate .resultset.json
+          SimpleCov.result
+        end
+      end
     end
   end
 
-  add_filter '/vendor/ruby/'
-  add_filter 'config/initializers/'
-
-  add_group 'Controllers', 'app/controllers'
-  add_group 'Models', 'app/models'
-  add_group 'Mailers', 'app/mailers'
-  add_group 'Helpers', 'app/helpers'
-  add_group 'Workers', %w(app/jobs app/workers)
-  add_group 'Libraries', 'lib'
-  add_group 'Services', 'app/services'
-  add_group 'Finders', 'app/finders'
-  add_group 'Uploaders', 'app/uploaders'
-  add_group 'Validators', 'app/validators'
-
-  merge_timeout 7200
+  def configure_profile
+    SimpleCov.configure do
+      load_profile 'test_frameworks'
+      track_files '{app,lib}/**/*.rb'
+
+      add_filter '/vendor/ruby/'
+      add_filter 'config/initializers/'
+
+      add_group 'Controllers', 'app/controllers'
+      add_group 'Models', 'app/models'
+      add_group 'Mailers', 'app/mailers'
+      add_group 'Helpers', 'app/helpers'
+      add_group 'Workers', %w(app/jobs app/workers)
+      add_group 'Libraries', 'lib'
+      add_group 'Services', 'app/services'
+      add_group 'Finders', 'app/finders'
+      add_group 'Uploaders', 'app/uploaders'
+      add_group 'Validators', 'app/validators'
+
+      merge_timeout 7200
+    end
+  end
 end

spec/spec_helper.rb

-require_relative 'simplecov_env'
-SimpleCov.start if ENV['SIMPLECOV']
+require './spec/simplecov_env'
+SimpleCovEnv.start!
 
 ENV["RAILS_ENV"] ||= 'test'