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Validating Devise Engine Initialization in heartcombo/devise

This test suite validates the Devise engine’s initialization and Rails integration components. It ensures proper initializer sequencing and deprecation handling in the Rails environment.

Test Coverage Overview

The test suite focuses on critical Rails integration points for the Devise authentication engine.

Validates initializer positioning between load_config_initializers and build_middleware_stack
Tests deprecation handling for Rails 7.1+ compatibility
Ensures proper integration with Rails application architecture

Implementation Analysis

The testing approach utilizes ActiveSupport::TestCase for unit testing Rails-specific functionality. It implements targeted assertions to verify initialization order and deprecation configuration.

Uses Rails test helpers and assertions
Employs conditional testing for version-specific features
Focuses on engine initialization workflow

Technical Details

Test Framework: Minitest
Testing Environment: Rails Test Environment
Key Dependencies: ActiveSupport::TestCase
Configuration: Devise::Test version detection

Best Practices Demonstrated

The test suite exemplifies clean testing practices for Rails engine integration verification.

Version-aware conditional testing
Explicit initialization sequence validation
Clear separation of concerns between initialization and deprecation tests
Focused test cases with specific assertions

heartcombo/devise

test/rails_test.rb

            
# frozen_string_literal: true

require 'test_helper'

class RailsTest < ActiveSupport::TestCase
  test 'correct initializer position' do
    initializer = Devise::Engine.initializers.detect { |i| i.name == 'devise.omniauth' }
    assert_equal :load_config_initializers, initializer.after
    assert_equal :build_middleware_stack, initializer.before
  end

  if Devise::Test.rails71_and_up?
    test 'deprecator is added to application deprecators' do
      assert_not_nil Rails.application.deprecators[:devise]
    end
  end
end