Rakefile in prawn-2.2.2 vs Rakefile in prawn-2.3.0

@@ -1,15 +1,14 @@
-require 'bundler'
-Bundler.setup
+# frozen_string_literal: true
 
 require 'rake'
 require 'rspec/core/rake_task'
 require 'yard'
 require 'rubygems/package_task'
 require 'rubocop/rake_task'
 
-task default: [:spec, :rubocop]
+task default: %i[spec rubocop]
 
 desc 'Run all rspec files'
 RSpec::Core::RakeTask.new('spec') do |c|
   c.rspec_opts = '-t ~unresolved'
 end
@@ -43,5 +42,13 @@
   ARGV.clear
   IRB.start
 end
 
 RuboCop::RakeTask.new
+
+task :checksum do
+  require 'digest/sha2'
+  built_gem_path = "prawn-#{Prawn::VERSION}.gem"
+  checksum = Digest::SHA512.new.hexdigest(File.read(built_gem_path))
+  checksum_path = "checksums/#{built_gem_path}.sha512"
+  File.write(checksum_path, checksum)
+end