instance_variable.rb in rubocop-rspec-1.4.0

- old
+ new

@@ -1,6 +1,7 @@
 # encoding: utf-8
+# frozen_string_literal: true
 
 module RuboCop
   module Cop
     module RSpec
       # When you have to assign a variable instead of using an instance
@@ -17,15 +18,15 @@
       #   describe MyClass do
       #     let(:foo) { [] }
       #     it { expect(foo).to be_empty }
       #   end
       class InstanceVariable < Cop
-        MESSAGE = 'Use `let` instead of an instance variable'
+        MESSAGE = 'Use `let` instead of an instance variable'.freeze
         EXAMPLE_GROUP_METHODS = [
           :example_group, :describe, :context, :xdescribe, :xcontext,
           :fdescribe, :fcontext, :shared_examples, :shared_context,
           :share_examples_for, :shared_examples_for, :feature
-        ]
+        ].freeze
 
         def on_block(node)
           method, _args, _body = *node
           _receiver, method_name, _object = *method
           @in_spec = true if EXAMPLE_GROUP_METHODS.include?(method_name)