rails--rails/activesupport/test/hash_with_indifferent_access_test.rb

require 'abstract_unit'
require 'active_support/hash_with_indifferent_access'

class HashWithIndifferentAccessTest < ActiveSupport::TestCase
  def test_reverse_merge
    hash = HashWithIndifferentAccess.new key: :old_value
    hash.reverse_merge! key: :new_value
    assert_equal :old_value, hash[:key]
  end
end
Add necessary 'require reverse_merge' to HAWI.rb Hashes with indifferent access should support `reverse_merge` out-of-the-box but they don't; for instance the following code fails: ```ruby require 'active_support' require 'active_support/hash_with_indifferent_access' hash = HashWithIndifferentAccess.new key: :old_value hash.reverse_merge key: :new_value ``` This PR fixes the case above by simply requiring `active_support/core_ext/hash/reverse_merge` in `hash_with_indifferent_access.rb` and adding a test that confirms the fix. --- Here are more details about the bugfix. Currently, `reverse_merge` is [defined in HashWithIndifferentAccess](https://github.com/rails/rails/blob/4e8ea13ba1a0870905a46fac5f232d9f41eef8a4/activesupport/lib/active_support/hash_with_indifferent_access.rb#L208) by invoking `super`, that is by invoking `Hash#reverse_merge`: ```ruby def reverse_merge(other_hash) super(self.class.new_from_hash_copying_default(other_hash)) end ``` However, Ruby's `Hash` does not have the `reverse_merge` by default: it must be added by ActiveSupport, and that requires the following line of code to be present: ```ruby require 'active_support/core_ext/hash/reverse_merge' ``` 2014-09-23 14:18:11 -04:00			`require 'abstract_unit'`
			`require 'active_support/hash_with_indifferent_access'`

			`class HashWithIndifferentAccessTest < ActiveSupport::TestCase`
			`def test_reverse_merge`
			`hash = HashWithIndifferentAccess.new key: :old_value`
			`hash.reverse_merge! key: :new_value`
			`assert_equal :old_value, hash[:key]`
			`end`
			`end`