Remove usage of strip_heredoc in the framework in favor of <<~

Some places we can't remove because Ruby still don't have a method
equivalent to strip_heredoc to be called in an already existent string.

1 files changed, 2 insertions, 3 deletions

diff --git a/actionpack/test/controller/parameters/serialization_test.rb b/actionpack/test/controller/parameters/serialization_test.rb
index 7809d0f357..7708c8e4fe 100644
--- a/actionpack/test/controller/parameters/serialization_test.rb
+++ b/actionpack/test/controller/parameters/serialization_test.rb
@@ -2,7 +2,6 @@
 
 require "abstract_unit"
 require "action_controller/metal/strong_parameters"
-require "active_support/core_ext/string/strip"
 
 class ParametersSerializationTest < ActiveSupport::TestCase
   setup do
@@ -31,7 +30,7 @@ class ParametersSerializationTest < ActiveSupport::TestCase
   end
 
   test "yaml backwardscompatible with psych 2.0.8 format" do
-    params = YAML.load <<-end_of_yaml.strip_heredoc
+    params = YAML.load <<~end_of_yaml
       --- !ruby/hash:ActionController::Parameters
       key: :value
     end_of_yaml
@@ -41,7 +40,7 @@ class ParametersSerializationTest < ActiveSupport::TestCase
   end
 
   test "yaml backwardscompatible with psych 2.0.9+ format" do
-    params = YAML.load(<<-end_of_yaml.strip_heredoc)
+    params = YAML.load(<<~end_of_yaml)
       --- !ruby/hash-with-ivars:ActionController::Parameters
       elements:
         key: :value