Rakefile in solidus_sample-2.5.2 vs Rakefile in solidus_sample-2.6.0.rc1

@@ -1,14 +1,16 @@
+# frozen_string_literal: true
+
 require 'rake'
 require 'rake/testtask'
 require 'rspec/core/rake_task'
 require 'spree/testing_support/dummy_app/rake_tasks'
 
 RSpec::Core::RakeTask.new
 task default: :spec
 
 DummyApp::RakeTasks.new(
-  gem_root: File.expand_path('../', __FILE__),
+  gem_root: File.expand_path(__dir__),
   lib_name: 'solidus_sample'
 )
 
 task test_app: 'db:reset'