Add `Style/RedundantFreeze` to remove redudant `.freeze`

Since Rails 6.0 will support Ruby 2.4.1 or higher
`# frozen_string_literal: true` magic comment is enough to make string object frozen.
This magic comment is enabled by `Style/FrozenStringLiteralComment` cop.

* Exclude these files not to auto correct false positive `Regexp#freeze`
 - 'actionpack/lib/action_dispatch/journey/router/utils.rb'
 - 'activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb'

It has been fixed by https://github.com/rubocop-hq/rubocop/pull/6333
Once the newer version of RuboCop released and available at Code Climate these exclude entries should be removed.

* Replace `String#freeze` with `String#-@` manually if explicit frozen string objects are required

 - 'actionpack/test/controller/test_case_test.rb'
 - 'activemodel/test/cases/type/string_test.rb'
 - 'activesupport/lib/active_support/core_ext/string/strip.rb'
 - 'activesupport/test/core_ext/string_ext_test.rb'
 - 'railties/test/generators/actions_test.rb'

2 files changed, 9 insertions, 9 deletions

diff --git a/actionpack/lib/action_dispatch/journey/router/utils.rb b/actionpack/lib/action_dispatch/journey/router/utils.rb
index 3bbb187f5c..3c8b9a6eaa 100644
--- a/actionpack/lib/action_dispatch/journey/router/utils.rb
+++ b/actionpack/lib/action_dispatch/journey/router/utils.rb
@@ -18,10 +18,10 @@ module ActionDispatch
           path ||= ""
           encoding = path.encoding
           path = +"/#{path}"
-          path.squeeze!("/".freeze)
-          path.sub!(%r{/+\Z}, "".freeze)
+          path.squeeze!("/")
+          path.sub!(%r{/+\Z}, "")
           path.gsub!(/(%[a-f0-9]{2})/) { $1.upcase }
-          path = +"/" if path == "".freeze
+          path = +"/" if path == ""
           path.force_encoding(encoding)
           path
         end
@@ -29,16 +29,16 @@ module ActionDispatch
         # URI path and fragment escaping
         # https://tools.ietf.org/html/rfc3986
         class UriEncoder # :nodoc:
-          ENCODE   = "%%%02X".freeze
+          ENCODE   = "%%%02X"
           US_ASCII = Encoding::US_ASCII
           UTF_8    = Encoding::UTF_8
           EMPTY    = (+"").force_encoding(US_ASCII).freeze
           DEC2HEX  = (0..255).to_a.map { |i| ENCODE % i }.map { |s| s.force_encoding(US_ASCII) }
 
-          ALPHA = "a-zA-Z".freeze
-          DIGIT = "0-9".freeze
-          UNRESERVED = "#{ALPHA}#{DIGIT}\\-\\._~".freeze
-          SUB_DELIMS = "!\\$&'\\(\\)\\*\\+,;=".freeze
+          ALPHA = "a-zA-Z"
+          DIGIT = "0-9"
+          UNRESERVED = "#{ALPHA}#{DIGIT}\\-\\._~"
+          SUB_DELIMS = "!\\$&'\\(\\)\\*\\+,;="
 
           ESCAPED  = /%[a-zA-Z0-9]{2}/.freeze
 
diff --git a/actionpack/lib/action_dispatch/journey/visitors.rb b/actionpack/lib/action_dispatch/journey/visitors.rb
index 3395471a85..d2619cbf3a 100644
--- a/actionpack/lib/action_dispatch/journey/visitors.rb
+++ b/actionpack/lib/action_dispatch/journey/visitors.rb
@@ -40,7 +40,7 @@ module ActionDispatch
         @parameters.each do |index|
           param = parts[index]
           value = hash[param.name]
-          return "".freeze unless value
+          return "" unless value
           parts[index] = param.escape value
         end