Fix Style/StringLiteralsInInterpolation

.rubocop_todo.yml

@@ -342,10 +342,3 @@ Style/SpaceInsideParens:
 # SupportedStyles: use_perl_names, use_english_names
 Style/SpecialGlobalVars:
   Enabled: false
-
-# Offense count: 1
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle, SupportedStyles.
-# SupportedStyles: single_quotes, double_quotes
-Style/StringLiteralsInInterpolation:
-  Enabled: false

Rakefile

@@ -4,7 +4,7 @@ Bundler::GemHelper.install_tasks
 desc "Set a relevant database.yml for testing"
 task :prepare do
   ENV["DB"] ||= "sqlite"
-  FileUtils.cp "test/dummy/config/database.#{ENV["DB"]}.yml", "test/dummy/config/database.yml"
+  FileUtils.cp "test/dummy/config/database.#{ENV['DB']}.yml", "test/dummy/config/database.yml"
 end
 
 require "rake/testtask"