hashie#559 - #deep_symbolize_keys is inconsistent in Rails 7

spec/integration/rails7/.rspec

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+--colour
+--format=documentation
+--pattern=*_spec.rb

spec/integration/rails7/Gemfile

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+source 'http://rubygems.org'
+
+gem 'hashie', path: '../../..'
+gem 'rails', '~> 7.0.2.3'
+gem 'rspec', '~> 3.11.0'
+gem 'rspec-rails'

spec/integration/rails7/app.rb

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+require 'action_controller/railtie'
+require 'action_view/railtie'
+require 'action_view/testing/resolvers'
+require 'rails/test_unit/railtie'
+
+module RailsApp
+  class Application < ::Rails::Application
+    config.eager_load      = false
+    config.secret_key_base = 'hashieintegrationtest'
+  end
+end
+
+Bundler.require(:default, Rails.env)
+
+RailsApp::Application.initialize!

spec/integration/rails7/integration_spec.rb

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+ENV['RAILS_ENV'] = 'test'
+
+require 'rspec/core'
+
+RSpec.describe 'rails' do
+  before do
+    require 'bundler'
+    require_relative 'app'
+    require 'rspec/rails'
+  end
+
+  it 'uses rails7' do
+    expect(Rails.version).to(eq("7.0.2.3"))
+  end
+
+  context '#deep_symbolize_keys' do
+    let(:mash) do
+      Hashie::Mash.new("shallow" => 1, "top-level" => { "deep" => 3, "nested" => 4 })
+    end
+
+    subject { mash.deep_symbolize_keys }
+
+    it 'symbolizes keys by access' do
+      expect(mash[:'top-level'][:deep]).to(eq(3))
+    end
+
+    it 'does not play well with #without, which calls each element directly' do
+      expect(mash[:'top-level'].without(:deep, :nested)).to(be_blank)
+    end
+
+    it 'does play well with #except, which monkey-patches Hash' do
+      expect(mash[:'top-level'].except(:deep, :nested)).to(be_blank)
+    end
+  end
+end