diff --git a/spec/functions/stdlib_ensure_spec.rb b/spec/functions/stdlib_ensure_spec.rb
index ebdcb9c..8a110b8 100644
--- a/spec/functions/stdlib_ensure_spec.rb
+++ b/spec/functions/stdlib_ensure_spec.rb
@@ -1,18 +1,20 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe 'stdlib::ensure' do
   context 'work with service resource' do
     it { is_expected.to run.with_params('present', 'service').and_return('running') }
     it { is_expected.to run.with_params(true, 'service').and_return('running') }
     it { is_expected.to run.with_params('absent', 'service').and_return('stopped') }
     it { is_expected.to run.with_params(false, 'service').and_return('stopped') }
   end
   ['directory', 'link', 'mounted', 'file'].each do |resource|
     context "work with #{resource} resource" do
       it { is_expected.to run.with_params('present', resource).and_return(resource) }
       it { is_expected.to run.with_params(true, resource).and_return(resource) }
       it { is_expected.to run.with_params('absent', resource).and_return('absent') }
       it { is_expected.to run.with_params(false, resource).and_return('absent') }
     end
   end
 end
diff --git a/spec/type_aliases/email_spec.rb b/spec/type_aliases/email_spec.rb
index 5c262c9..add96ee 100644
--- a/spec/type_aliases/email_spec.rb
+++ b/spec/type_aliases/email_spec.rb
@@ -1,70 +1,72 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
 # Test cases are a combination of the test cases used in MediaWiki[1] and a
 # Reference found on line[2].  Some of the test cases in the later list have
 # been dropped as the regex used in the HTML5 specification[3] (and in this type)
 # allows for wilful violation of the RFC's
 #
 # [1]https://github.com/wikimedia/mediawiki/blob/master/tests/phpunit/integration \
 #   /includes/SanitizerValidateEmailTest.php
 # [2]https://gist.github.com/cjaoude/fd9910626629b53c4d25
 # [3]https://html.spec.whatwg.org/multipage/input.html#valid-e-mail-address
 
 describe 'Stdlib::Email' do
   describe 'valid handling' do
     ['email@example.com',
      'EMAIL@example.com',
      'email@EXAMPLE.com',
      'email@192.0.2.1',
      '_______@example.com',
      'firstname.lastname@example.com',
      'firstname+lastname@example.com',
      'firstname-lastname@example.com',
      '1234567890@example.com',
      'email@subdomain.example.com',
      'email@example-one.com',
      'email@example.name',
      'email@example.museum',
      'email@example.co.jp',
      'email@example',
      'user@example.1234',
      'user@a'].each do |value|
       describe value.inspect do
         it { is_expected.to allow_value(value) }
       end
     end
   end
   describe 'invalid handling' do
     ['plainaddress',
      '#@%^%#$@#$@#.com',
      '@example.com',
      ' email@example.com',
      'email@example.com ',
      "email@example.com\t",
      'user email@example.com',
      'useremail@example com',
      'user,email@example.com',
      'useremail@example,com',
      'useremail@.',
      'useremail@.example.org',
      'useremail@a......',
      'useràexample.com',
      'Joe Smith <email@example.com>',
      'email.example.com',
      'email@example@example.com',
      'あいうえお@example.com',
      'email@example.com (Joe Smith)',
      'email@-example.com',
      'email@example..com',
      'random stuff multiline
      valid@email.com
      more random stuff $^*!',
      '”(),:;<>[\]@example.com',
      'just”not”right@example.com',
      'this\ is"really"not\allowed@example.com'].each do |value|
       describe value.inspect do
         it { is_expected.not_to allow_value(value) }
       end
     end
   end
 end