integration_test: fix indentation for test formulae

Library/Homebrew/global.rb

@@ -29,6 +29,7 @@ require "active_support/core_ext/hash/deep_merge"
 require "active_support/core_ext/file/atomic"
 require "active_support/core_ext/enumerable"
 require "active_support/core_ext/string/exclude"
+require "active_support/core_ext/string/indent"
 
 I18n.backend.available_locales # Initialize locales so they can be overwritten.
 I18n.backend.store_translations :en, support: { array: { last_word_connector: " and " } }

Library/Homebrew/test/support/helper/spec/shared_context/integration_test.rb

@@ -171,7 +171,7 @@ RSpec.shared_context "integration test" do
     Formulary.core_path(name).tap do |formula_path|
       formula_path.write <<~RUBY
         class #{Formulary.class_s(name)} < Formula
-          #{content}
+        #{content.indent(2)}
         end
       RUBY
     end

Library/Homebrew/test/utils/bottles/bottles_spec.rb

@@ -17,8 +17,6 @@ describe Utils::Bottles do
 
   describe "#add_bottle_stanza!" do
     let(:bottle_output) do
-      require "active_support/core_ext/string/indent"
-
       <<~RUBY.chomp.indent(2)
         bottle do
           sha256 "f7b1fc772c79c20fddf621ccc791090bc1085fcef4da6cca03399424c66e06ca" => :sierra