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Testing Grape Railtie Deprecator Integration in ruby-grape/grape

This test suite validates the integration between Grape and Rails through the Railtie functionality, specifically focusing on deprecation handling in Rails 7.1+ environments. It ensures proper initialization and configuration of Grape’s deprecator within a Rails application context.

Test Coverage Overview

The test coverage focuses on the Grape::Railtie integration with Rails applications, specifically testing deprecator configuration. Key functionality includes:

Verification of Grape deprecator initialization
Rails 7.1+ compatibility testing
Application configuration handling

Implementation Analysis

The testing approach utilizes RSpec to validate Railtie functionality through a minimal Rails application setup. The implementation employs dynamic class creation and configuration to isolate the testing environment.

Technical patterns include:

Dynamic Rails application class generation
Explicit autoloader configuration
Version-specific conditional testing

Technical Details

Testing tools and configuration:

RSpec for test framework
Rails application stub with minimal configuration
ActiveSupport::Dependencies management
Rails version-specific load defaults
Eager loading disabled for test isolation

Best Practices Demonstrated

The test suite demonstrates several testing best practices for Rails integration testing:

Isolated test environment setup
Proper version checking and conditional testing
Clean subject/let pattern usage
Explicit dependency management
Focused test scope with clear expectations

ruby-grape/grape

spec/integration/rails/railtie_spec.rb

            
# frozen_string_literal: true

if defined?(Rails) && ActiveSupport.gem_version >= Gem::Version.new('7.1')
  describe Grape::Railtie do
    describe '.railtie' do
      subject { test_app.deprecators[:grape] }

      let(:test_app) do
        # https://github.com/rails/rails/issues/51784
        # same error as described if not redefining the following
        ActiveSupport::Dependencies.autoload_paths = []
        ActiveSupport::Dependencies.autoload_once_paths = []

        Class.new(Rails::Application) do
          config.eager_load = false
          config.load_defaults "#{Rails::VERSION::MAJOR}.#{Rails::VERSION::MINOR}"
        end
      end

      before { test_app.initialize! }

      it { is_expected.to be(Grape.deprecator) }
    end
  end
end