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'

31 files changed, 57 insertions, 57 deletions

diff --git a/activesupport/lib/active_support/backtrace_cleaner.rb b/activesupport/lib/active_support/backtrace_cleaner.rb
index 1796956bd7..62973eca58 100644
--- a/activesupport/lib/active_support/backtrace_cleaner.rb
+++ b/activesupport/lib/active_support/backtrace_cleaner.rb
@@ -93,7 +93,7 @@ module ActiveSupport
         return if gems_paths.empty?
 
         gems_regexp = %r{(#{gems_paths.join('|')})/(bundler/)?gems/([^/]+)-([\w.]+)/(.*)}
-        gems_result = '\3 (\4) \5'.freeze
+        gems_result = '\3 (\4) \5'
         add_filter { |line| line.sub(gems_regexp, gems_result) }
       end
 
diff --git a/activesupport/lib/active_support/core_ext/load_error.rb b/activesupport/lib/active_support/core_ext/load_error.rb
index 6b0dcab905..b81ed0605e 100644
--- a/activesupport/lib/active_support/core_ext/load_error.rb
+++ b/activesupport/lib/active_support/core_ext/load_error.rb
@@ -4,6 +4,6 @@ class LoadError
   # Returns true if the given path name (except perhaps for the ".rb"
   # extension) is the missing file which caused the exception to be raised.
   def is_missing?(location)
-    location.sub(/\.rb$/, "".freeze) == path.to_s.sub(/\.rb$/, "".freeze)
+    location.sub(/\.rb$/, "") == path.to_s.sub(/\.rb$/, "")
   end
 end
diff --git a/activesupport/lib/active_support/core_ext/string/strip.rb b/activesupport/lib/active_support/core_ext/string/strip.rb
index 6f9834bb16..60e9952ee6 100644
--- a/activesupport/lib/active_support/core_ext/string/strip.rb
+++ b/activesupport/lib/active_support/core_ext/string/strip.rb
@@ -20,7 +20,7 @@ class String
   # Technically, it looks for the least indented non-empty line
   # in the whole string, and removes that amount of leading whitespace.
   def strip_heredoc
-    gsub(/^#{scan(/^[ \t]*(?=\S)/).min}/, "".freeze).tap do |stripped|
+    gsub(/^#{scan(/^[ \t]*(?=\S)/).min}/, "").tap do |stripped|
       stripped.freeze if frozen?
     end
   end
diff --git a/activesupport/lib/active_support/dependencies.rb b/activesupport/lib/active_support/dependencies.rb
index 238a9f0ee6..063d8d1587 100644
--- a/activesupport/lib/active_support/dependencies.rb
+++ b/activesupport/lib/active_support/dependencies.rb
@@ -144,7 +144,7 @@ module ActiveSupport #:nodoc:
 
           # Normalize the list of new constants, and add them to the list we will return
           new_constants.each do |suffix|
-            constants << ([namespace, suffix] - ["Object"]).join("::".freeze)
+            constants << ([namespace, suffix] - ["Object"]).join("::")
           end
         end
         constants
@@ -410,7 +410,7 @@ module ActiveSupport #:nodoc:
         next unless expanded_path.start_with?(expanded_root)
 
         root_size = expanded_root.size
-        next if expanded_path[root_size] != ?/.freeze
+        next if expanded_path[root_size] != ?/
 
         nesting = expanded_path[(root_size + 1)..-1]
         paths << nesting.camelize unless nesting.blank?
@@ -505,7 +505,7 @@ module ActiveSupport #:nodoc:
 
       if file_path
         expanded = File.expand_path(file_path)
-        expanded.sub!(/\.rb\z/, "".freeze)
+        expanded.sub!(/\.rb\z/, "")
 
         if loading.include?(expanded)
           raise "Circular dependency detected while autoloading constant #{qualified_name}"
diff --git a/activesupport/lib/active_support/duration/iso8601_parser.rb b/activesupport/lib/active_support/duration/iso8601_parser.rb
index 414f727705..d3233e6111 100644
--- a/activesupport/lib/active_support/duration/iso8601_parser.rb
+++ b/activesupport/lib/active_support/duration/iso8601_parser.rb
@@ -13,8 +13,8 @@ module ActiveSupport
       class ParsingError < ::ArgumentError; end
 
       PERIOD_OR_COMMA = /\.|,/
-      PERIOD = ".".freeze
-      COMMA = ",".freeze
+      PERIOD = "."
+      COMMA = ","
 
       SIGN_MARKER = /\A\-|\+|/
       DATE_MARKER = /P/
diff --git a/activesupport/lib/active_support/duration/iso8601_serializer.rb b/activesupport/lib/active_support/duration/iso8601_serializer.rb
index 0fb0e3f3a5..1125454919 100644
--- a/activesupport/lib/active_support/duration/iso8601_serializer.rb
+++ b/activesupport/lib/active_support/duration/iso8601_serializer.rb
@@ -14,7 +14,7 @@ module ActiveSupport
       # Builds and returns output string.
       def serialize
         parts, sign = normalize
-        return "PT0S".freeze if parts.empty?
+        return "PT0S" if parts.empty?
 
         output = +"P"
         output << "#{parts[:years]}Y"   if parts.key?(:years)
diff --git a/activesupport/lib/active_support/inflector/methods.rb b/activesupport/lib/active_support/inflector/methods.rb
index 7359de762a..1af9833d46 100644
--- a/activesupport/lib/active_support/inflector/methods.rb
+++ b/activesupport/lib/active_support/inflector/methods.rb
@@ -73,7 +73,7 @@ module ActiveSupport
         string = string.sub(inflections.acronyms_camelize_regex) { |match| match.downcase }
       end
       string.gsub!(/(?:_|(\/))([a-z\d]*)/i) { "#{$1}#{inflections.acronyms[$2] || $2.capitalize}" }
-      string.gsub!("/".freeze, "::".freeze)
+      string.gsub!("/", "::")
       string
     end
 
@@ -90,11 +90,11 @@ module ActiveSupport
     #   camelize(underscore('SSLError'))  # => "SslError"
     def underscore(camel_cased_word)
       return camel_cased_word unless /[A-Z-]|::/.match?(camel_cased_word)
-      word = camel_cased_word.to_s.gsub("::".freeze, "/".freeze)
-      word.gsub!(inflections.acronyms_underscore_regex) { "#{$1 && '_'.freeze }#{$2.downcase}" }
-      word.gsub!(/([A-Z\d]+)([A-Z][a-z])/, '\1_\2'.freeze)
-      word.gsub!(/([a-z\d])([A-Z])/, '\1_\2'.freeze)
-      word.tr!("-".freeze, "_".freeze)
+      word = camel_cased_word.to_s.gsub("::", "/")
+      word.gsub!(inflections.acronyms_underscore_regex) { "#{$1 && '_' }#{$2.downcase}" }
+      word.gsub!(/([A-Z\d]+)([A-Z][a-z])/, '\1_\2')
+      word.gsub!(/([a-z\d])([A-Z])/, '\1_\2')
+      word.tr!("-", "_")
       word.downcase!
       word
     end
@@ -130,11 +130,11 @@ module ActiveSupport
 
       inflections.humans.each { |(rule, replacement)| break if result.sub!(rule, replacement) }
 
-      result.sub!(/\A_+/, "".freeze)
+      result.sub!(/\A_+/, "")
       unless keep_id_suffix
-        result.sub!(/_id\z/, "".freeze)
+        result.sub!(/_id\z/, "")
       end
-      result.tr!("_".freeze, " ".freeze)
+      result.tr!("_", " ")
 
       result.gsub!(/([a-z\d]*)/i) do |match|
         "#{inflections.acronyms[match.downcase] || match.downcase}"
@@ -199,14 +199,14 @@ module ActiveSupport
     #   classify('calculus')     # => "Calculus"
     def classify(table_name)
       # strip out any leading schema name
-      camelize(singularize(table_name.to_s.sub(/.*\./, "".freeze)))
+      camelize(singularize(table_name.to_s.sub(/.*\./, "")))
     end
 
     # Replaces underscores with dashes in the string.
     #
     #   dasherize('puni_puni') # => "puni-puni"
     def dasherize(underscored_word)
-      underscored_word.tr("_".freeze, "-".freeze)
+      underscored_word.tr("_", "-")
     end
 
     # Removes the module part from the expression in the string.
@@ -269,7 +269,7 @@ module ActiveSupport
     # NameError is raised when the name is not in CamelCase or the constant is
     # unknown.
     def constantize(camel_cased_word)
-      names = camel_cased_word.split("::".freeze)
+      names = camel_cased_word.split("::")
 
       # Trigger a built-in NameError exception including the ill-formed constant in the message.
       Object.const_get(camel_cased_word) if names.empty?
@@ -364,7 +364,7 @@ module ActiveSupport
       #   const_regexp("Foo::Bar::Baz") # => "Foo(::Bar(::Baz)?)?"
       #   const_regexp("::")            # => "::"
       def const_regexp(camel_cased_word)
-        parts = camel_cased_word.split("::".freeze)
+        parts = camel_cased_word.split("::")
 
         return Regexp.escape(camel_cased_word) if parts.blank?
 
diff --git a/activesupport/lib/active_support/inflector/transliterate.rb b/activesupport/lib/active_support/inflector/transliterate.rb
index 6f2ca4999c..dbc8b8a2fa 100644
--- a/activesupport/lib/active_support/inflector/transliterate.rb
+++ b/activesupport/lib/active_support/inflector/transliterate.rb
@@ -58,7 +58,7 @@ module ActiveSupport
     #   I18n.locale = :de
     #   transliterate('Jürgen')
     #   # => "Juergen"
-    def transliterate(string, replacement = "?".freeze)
+    def transliterate(string, replacement = "?")
       raise ArgumentError, "Can only transliterate strings. Received #{string.class.name}" unless string.is_a?(String)
 
       I18n.transliterate(
@@ -97,7 +97,7 @@ module ActiveSupport
       parameterized_string.gsub!(/[^a-z0-9\-_]+/i, separator)
 
       unless separator.nil? || separator.empty?
-        if separator == "-".freeze
+        if separator == "-"
           re_duplicate_separator        = /-{2,}/
           re_leading_trailing_separator = /^-|-$/i
         else
@@ -108,7 +108,7 @@ module ActiveSupport
         # No more than one of the separator in a row.
         parameterized_string.gsub!(re_duplicate_separator, separator)
         # Remove leading/trailing separator.
-        parameterized_string.gsub!(re_leading_trailing_separator, "".freeze)
+        parameterized_string.gsub!(re_leading_trailing_separator, "")
       end
 
       parameterized_string.downcase! unless preserve_case
diff --git a/activesupport/lib/active_support/message_encryptor.rb b/activesupport/lib/active_support/message_encryptor.rb
index 404404cad1..6f7302e732 100644
--- a/activesupport/lib/active_support/message_encryptor.rb
+++ b/activesupport/lib/active_support/message_encryptor.rb
@@ -182,7 +182,7 @@ module ActiveSupport
 
       def _decrypt(encrypted_message, purpose)
         cipher = new_cipher
-        encrypted_data, iv, auth_tag = encrypted_message.split("--".freeze).map { |v| ::Base64.strict_decode64(v) }
+        encrypted_data, iv, auth_tag = encrypted_message.split("--").map { |v| ::Base64.strict_decode64(v) }
 
         # Currently the OpenSSL bindings do not raise an error if auth_tag is
         # truncated, which would allow an attacker to easily forge it. See
diff --git a/activesupport/lib/active_support/message_verifier.rb b/activesupport/lib/active_support/message_verifier.rb
index 83c39c0a86..64c557bec6 100644
--- a/activesupport/lib/active_support/message_verifier.rb
+++ b/activesupport/lib/active_support/message_verifier.rb
@@ -122,7 +122,7 @@ module ActiveSupport
     def valid_message?(signed_message)
       return if signed_message.nil? || !signed_message.valid_encoding? || signed_message.blank?
 
-      data, digest = signed_message.split("--".freeze)
+      data, digest = signed_message.split("--")
       data.present? && digest.present? && ActiveSupport::SecurityUtils.secure_compare(digest, generate_digest(data))
     end
 
@@ -150,7 +150,7 @@ module ActiveSupport
     def verified(signed_message, purpose: nil, **)
       if valid_message?(signed_message)
         begin
-          data = signed_message.split("--".freeze)[0]
+          data = signed_message.split("--")[0]
           message = Messages::Metadata.verify(decode(data), purpose)
           @serializer.load(message) if message
         rescue ArgumentError => argument_error
diff --git a/activesupport/lib/active_support/number_helper/number_to_currency_converter.rb b/activesupport/lib/active_support/number_helper/number_to_currency_converter.rb
index a25e22cbd3..aef5b62aed 100644
--- a/activesupport/lib/active_support/number_helper/number_to_currency_converter.rb
+++ b/activesupport/lib/active_support/number_helper/number_to_currency_converter.rb
@@ -15,7 +15,7 @@ module ActiveSupport
         end
 
         rounded_number = NumberToRoundedConverter.convert(number, options)
-        format.gsub("%n".freeze, rounded_number).gsub("%u".freeze, options[:unit])
+        format.gsub("%n", rounded_number).gsub("%u", options[:unit])
       end
 
       private
diff --git a/activesupport/lib/active_support/number_helper/number_to_delimited_converter.rb b/activesupport/lib/active_support/number_helper/number_to_delimited_converter.rb
index d5b5706705..05427fef53 100644
--- a/activesupport/lib/active_support/number_helper/number_to_delimited_converter.rb
+++ b/activesupport/lib/active_support/number_helper/number_to_delimited_converter.rb
@@ -14,7 +14,7 @@ module ActiveSupport
       private
 
         def parts
-          left, right = number.to_s.split(".".freeze)
+          left, right = number.to_s.split(".")
           left.gsub!(delimiter_pattern) do |digit_to_delimit|
             "#{digit_to_delimit}#{options[:delimiter]}"
           end
diff --git a/activesupport/lib/active_support/number_helper/number_to_human_converter.rb b/activesupport/lib/active_support/number_helper/number_to_human_converter.rb
index 03eb6671ec..908f788ee3 100644
--- a/activesupport/lib/active_support/number_helper/number_to_human_converter.rb
+++ b/activesupport/lib/active_support/number_helper/number_to_human_converter.rb
@@ -25,7 +25,7 @@ module ActiveSupport
 
         rounded_number = NumberToRoundedConverter.convert(number, options)
         unit = determine_unit(units, exponent)
-        format.gsub("%n".freeze, rounded_number).gsub("%u".freeze, unit).strip
+        format.gsub("%n", rounded_number).gsub("%u", unit).strip
       end
 
       private
diff --git a/activesupport/lib/active_support/number_helper/number_to_human_size_converter.rb b/activesupport/lib/active_support/number_helper/number_to_human_size_converter.rb
index 842f2fc8df..0c72096b72 100644
--- a/activesupport/lib/active_support/number_helper/number_to_human_size_converter.rb
+++ b/activesupport/lib/active_support/number_helper/number_to_human_size_converter.rb
@@ -22,7 +22,7 @@ module ActiveSupport
           human_size = number / (base**exponent)
           number_to_format = NumberToRoundedConverter.convert(human_size, options)
         end
-        conversion_format.gsub("%n".freeze, number_to_format).gsub("%u".freeze, unit)
+        conversion_format.gsub("%n", number_to_format).gsub("%u", unit)
       end
 
       private
diff --git a/activesupport/lib/active_support/number_helper/number_to_percentage_converter.rb b/activesupport/lib/active_support/number_helper/number_to_percentage_converter.rb
index 4dcdad2e2c..6618ecffd5 100644
--- a/activesupport/lib/active_support/number_helper/number_to_percentage_converter.rb
+++ b/activesupport/lib/active_support/number_helper/number_to_percentage_converter.rb
@@ -7,7 +7,7 @@ module ActiveSupport
 
       def convert
         rounded_number = NumberToRoundedConverter.convert(number, options)
-        options[:format].gsub("%n".freeze, rounded_number)
+        options[:format].gsub("%n", rounded_number)
       end
     end
   end
diff --git a/activesupport/lib/active_support/number_helper/number_to_rounded_converter.rb b/activesupport/lib/active_support/number_helper/number_to_rounded_converter.rb
index eb528a0583..0ee5ef92dd 100644
--- a/activesupport/lib/active_support/number_helper/number_to_rounded_converter.rb
+++ b/activesupport/lib/active_support/number_helper/number_to_rounded_converter.rb
@@ -20,9 +20,9 @@ module ActiveSupport
           formatted_string =
             if BigDecimal === rounded_number && rounded_number.finite?
               s = rounded_number.to_s("F")
-              s << "0".freeze * precision
-              a, b = s.split(".".freeze, 2)
-              a << ".".freeze
+              s << "0" * precision
+              a, b = s.split(".", 2)
+              a << "."
               a << b[0, precision]
             else
               "%00.#{precision}f" % rounded_number
diff --git a/activesupport/lib/active_support/subscriber.rb b/activesupport/lib/active_support/subscriber.rb
index 5a4c3d74af..9562149f8d 100644
--- a/activesupport/lib/active_support/subscriber.rb
+++ b/activesupport/lib/active_support/subscriber.rb
@@ -92,7 +92,7 @@ module ActiveSupport
       event.finish!
       event.payload.merge!(payload)
 
-      method = name.split(".".freeze).first
+      method = name.split(".").first
       send(method, event)
     end
 
diff --git a/activesupport/lib/active_support/tagged_logging.rb b/activesupport/lib/active_support/tagged_logging.rb
index dd72da500c..d8a86d997e 100644
--- a/activesupport/lib/active_support/tagged_logging.rb
+++ b/activesupport/lib/active_support/tagged_logging.rb
@@ -46,7 +46,7 @@ module ActiveSupport
 
       def current_tags
         # We use our object ID here to avoid conflicting with other instances
-        thread_key = @thread_key ||= "activesupport_tagged_logging_tags:#{object_id}".freeze
+        thread_key = @thread_key ||= "activesupport_tagged_logging_tags:#{object_id}"
         Thread.current[thread_key] ||= []
       end
 
diff --git a/activesupport/lib/active_support/time_with_zone.rb b/activesupport/lib/active_support/time_with_zone.rb
index fb6956f64f..3be5f6f7b5 100644
--- a/activesupport/lib/active_support/time_with_zone.rb
+++ b/activesupport/lib/active_support/time_with_zone.rb
@@ -43,8 +43,8 @@ module ActiveSupport
       "Time"
     end
 
-    PRECISIONS = Hash.new { |h, n| h[n] = "%FT%T.%#{n}N".freeze }
-    PRECISIONS[0] = "%FT%T".freeze
+    PRECISIONS = Hash.new { |h, n| h[n] = "%FT%T.%#{n}N" }
+    PRECISIONS[0] = "%FT%T"
 
     include Comparable, DateAndTime::Compatibility
     attr_reader :time_zone
@@ -147,7 +147,7 @@ module ActiveSupport
     #
     #   Time.zone.now.xmlschema  # => "2014-12-04T11:02:37-05:00"
     def xmlschema(fraction_digits = 0)
-      "#{time.strftime(PRECISIONS[fraction_digits.to_i])}#{formatted_offset(true, 'Z'.freeze)}"
+      "#{time.strftime(PRECISIONS[fraction_digits.to_i])}#{formatted_offset(true, 'Z')}"
     end
     alias_method :iso8601, :xmlschema
     alias_method :rfc3339, :xmlschema
diff --git a/activesupport/lib/active_support/xml_mini/jdom.rb b/activesupport/lib/active_support/xml_mini/jdom.rb
index 59c65db2d5..32fe6ade28 100644
--- a/activesupport/lib/active_support/xml_mini/jdom.rb
+++ b/activesupport/lib/active_support/xml_mini/jdom.rb
@@ -18,7 +18,7 @@ module ActiveSupport
   module XmlMini_JDOM #:nodoc:
     extend self
 
-    CONTENT_KEY = "__content__".freeze
+    CONTENT_KEY = "__content__"
 
     NODE_TYPE_NAMES = %w{ATTRIBUTE_NODE CDATA_SECTION_NODE COMMENT_NODE DOCUMENT_FRAGMENT_NODE
     DOCUMENT_NODE DOCUMENT_TYPE_NODE ELEMENT_NODE ENTITY_NODE ENTITY_REFERENCE_NODE NOTATION_NODE
diff --git a/activesupport/lib/active_support/xml_mini/libxml.rb b/activesupport/lib/active_support/xml_mini/libxml.rb
index 2a16932f03..c2e999ef6c 100644
--- a/activesupport/lib/active_support/xml_mini/libxml.rb
+++ b/activesupport/lib/active_support/xml_mini/libxml.rb
@@ -34,7 +34,7 @@ module LibXML #:nodoc:
     end
 
     module Node #:nodoc:
-      CONTENT_ROOT = "__content__".freeze
+      CONTENT_ROOT = "__content__"
 
       # Convert XML document to hash.
       #
diff --git a/activesupport/lib/active_support/xml_mini/libxmlsax.rb b/activesupport/lib/active_support/xml_mini/libxmlsax.rb
index a22a2c9cb7..ac8acdfc3c 100644
--- a/activesupport/lib/active_support/xml_mini/libxmlsax.rb
+++ b/activesupport/lib/active_support/xml_mini/libxmlsax.rb
@@ -13,8 +13,8 @@ module ActiveSupport
     class HashBuilder
       include LibXML::XML::SaxParser::Callbacks
 
-      CONTENT_KEY   = "__content__".freeze
-      HASH_SIZE_KEY = "__hash_size__".freeze
+      CONTENT_KEY   = "__content__"
+      HASH_SIZE_KEY = "__hash_size__"
 
       attr_reader :hash
 
diff --git a/activesupport/lib/active_support/xml_mini/nokogiri.rb b/activesupport/lib/active_support/xml_mini/nokogiri.rb
index 4762a759d6..f76513f48b 100644
--- a/activesupport/lib/active_support/xml_mini/nokogiri.rb
+++ b/activesupport/lib/active_support/xml_mini/nokogiri.rb
@@ -38,7 +38,7 @@ module ActiveSupport
       end
 
       module Node #:nodoc:
-        CONTENT_ROOT = "__content__".freeze
+        CONTENT_ROOT = "__content__"
 
         # Convert XML document to hash.
         #
diff --git a/activesupport/lib/active_support/xml_mini/nokogirisax.rb b/activesupport/lib/active_support/xml_mini/nokogirisax.rb
index 0bbb4e258a..55cd72e093 100644
--- a/activesupport/lib/active_support/xml_mini/nokogirisax.rb
+++ b/activesupport/lib/active_support/xml_mini/nokogirisax.rb
@@ -16,8 +16,8 @@ module ActiveSupport
     # Class that will build the hash while the XML document
     # is being parsed using SAX events.
     class HashBuilder < Nokogiri::XML::SAX::Document
-      CONTENT_KEY   = "__content__".freeze
-      HASH_SIZE_KEY = "__hash_size__".freeze
+      CONTENT_KEY   = "__content__"
+      HASH_SIZE_KEY = "__hash_size__"
 
       attr_reader :hash
 
diff --git a/activesupport/lib/active_support/xml_mini/rexml.rb b/activesupport/lib/active_support/xml_mini/rexml.rb
index 55a155d4ee..8d6e3af066 100644
--- a/activesupport/lib/active_support/xml_mini/rexml.rb
+++ b/activesupport/lib/active_support/xml_mini/rexml.rb
@@ -8,7 +8,7 @@ module ActiveSupport
   module XmlMini_REXML #:nodoc:
     extend self
 
-    CONTENT_KEY = "__content__".freeze
+    CONTENT_KEY = "__content__"
 
     # Parse an XML Document string or IO into a simple hash.
     #
diff --git a/activesupport/test/core_ext/date_and_time_compatibility_test.rb b/activesupport/test/core_ext/date_and_time_compatibility_test.rb
index 266829a452..58a24b60b6 100644
--- a/activesupport/test/core_ext/date_and_time_compatibility_test.rb
+++ b/activesupport/test/core_ext/date_and_time_compatibility_test.rb
@@ -248,7 +248,7 @@ class DateAndTimeCompatibilityTest < ActiveSupport::TestCase
   def test_string_to_time_frozen_preserves_timezone
     with_preserve_timezone(true) do
       with_env_tz "US/Eastern" do
-        source = "2016-04-23T15:11:12+01:00".freeze
+        source = "2016-04-23T15:11:12+01:00"
         time = source.to_time
 
         assert_instance_of Time, time
@@ -262,7 +262,7 @@ class DateAndTimeCompatibilityTest < ActiveSupport::TestCase
   def test_string_to_time_frozen_does_not_preserve_time_zone
     with_preserve_timezone(false) do
       with_env_tz "US/Eastern" do
-        source = "2016-04-23T15:11:12+01:00".freeze
+        source = "2016-04-23T15:11:12+01:00"
         time = source.to_time
 
         assert_instance_of Time, time
diff --git a/activesupport/test/core_ext/object/instance_variables_test.rb b/activesupport/test/core_ext/object/instance_variables_test.rb
index cf1fe5dfa4..9052d209a3 100644
--- a/activesupport/test/core_ext/object/instance_variables_test.rb
+++ b/activesupport/test/core_ext/object/instance_variables_test.rb
@@ -23,7 +23,7 @@ class ObjectInstanceVariableTest < ActiveSupport::TestCase
   end
 
   def test_instance_exec_with_frozen_obj
-    assert_equal %w(olleh goodbye), "hello".freeze.instance_exec("goodbye") { |v| [reverse, v] }
+    assert_equal %w(olleh goodbye), "hello".instance_exec("goodbye") { |v| [reverse, v] }
   end
 
   def test_instance_exec_nested
diff --git a/activesupport/test/core_ext/string_ext_test.rb b/activesupport/test/core_ext/string_ext_test.rb
index a26473dc84..aa120a6f9a 100644
--- a/activesupport/test/core_ext/string_ext_test.rb
+++ b/activesupport/test/core_ext/string_ext_test.rb
@@ -25,7 +25,7 @@ class StringInflectionsTest < ActiveSupport::TestCase
   end
 
   def test_strip_heredoc_on_a_frozen_string
-    assert "".freeze.strip_heredoc.frozen?
+    assert "".strip_heredoc.frozen?
   end
 
   def test_strip_heredoc_on_a_string_with_no_lines
diff --git a/activesupport/test/multibyte_test_helpers.rb b/activesupport/test/multibyte_test_helpers.rb
index d97ce6727a..7565655f25 100644
--- a/activesupport/test/multibyte_test_helpers.rb
+++ b/activesupport/test/multibyte_test_helpers.rb
@@ -27,8 +27,8 @@ module MultibyteTestHelpers
   CACHE_DIR = "#{Dir.tmpdir}/cache/unicode_conformance/#{ActiveSupport::Multibyte::Unicode::UNICODE_VERSION}"
   FileUtils.mkdir_p(CACHE_DIR)
 
-  UNICODE_STRING = "こにちわ".freeze
-  ASCII_STRING = "ohayo".freeze
+  UNICODE_STRING = "こにちわ"
+  ASCII_STRING = "ohayo"
   BYTE_STRING = (+"\270\236\010\210\245").force_encoding("ASCII-8BIT").freeze
 
   def chars(str)
diff --git a/activesupport/test/xml_mini/rexml_engine_test.rb b/activesupport/test/xml_mini/rexml_engine_test.rb
index 34bf81fa75..b711619ba7 100644
--- a/activesupport/test/xml_mini/rexml_engine_test.rb
+++ b/activesupport/test/xml_mini/rexml_engine_test.rb
@@ -12,7 +12,7 @@ class REXMLEngineTest < XMLMiniEngineTest
   end
 
   def test_parse_from_frozen_string
-    xml_string = "<root></root>".freeze
+    xml_string = "<root></root>"
     assert_equal({ "root" => {} }, ActiveSupport::XmlMini.parse(xml_string))
   end
 
diff --git a/activesupport/test/xml_mini/xml_mini_engine_test.rb b/activesupport/test/xml_mini/xml_mini_engine_test.rb
index 5c4c28d9b7..c62e7e32c9 100644
--- a/activesupport/test/xml_mini/xml_mini_engine_test.rb
+++ b/activesupport/test/xml_mini/xml_mini_engine_test.rb
@@ -78,7 +78,7 @@ class XMLMiniEngineTest < ActiveSupport::TestCase
     end
 
     def test_parse_from_frozen_string
-      xml_string = "<root/>".freeze
+      xml_string = "<root/>"
       assert_equal({ "root" => {} }, ActiveSupport::XmlMini.parse(xml_string))
     end