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Testing Polymorphic Join Association Implementation in Ransack

This test suite validates the JoinAssociation functionality in Ransack’s Polyamorous module, focusing on polymorphic associations and thread safety. The tests ensure proper handling of reflection classes and options during join operations.

Test Coverage Overview

The test suite provides comprehensive coverage of the JoinAssociation class functionality.

Key areas tested include:

Thread safety of reflection objects
Polymorphic association handling
Reflection class swapping operations
Option preservation and modification

Implementation Analysis

The testing approach uses RSpec’s describe and context blocks to organize test scenarios for the JoinAssociation class. The implementation leverages let statements for setup and employs subject blocks for clear test organization.

Notable patterns include:

Dependency injection through join_dependency
Reflection manipulation testing
Block-based assertion testing

Technical Details

Testing infrastructure includes:

RSpec as the testing framework
Custom join_dependency helpers
Mock objects for Note, Article, and Person models
Reflection API integration

Best Practices Demonstrated

The test suite exemplifies several testing best practices in Ruby and RSpec.

Notable practices include:

Isolated test setup using let blocks
Clear subject definition
Explicit expectation statements
Proper scoping of test cases
Thread safety considerations in testing

activerecord-hackery/ransack

spec/polyamorous/join_association_spec.rb

            
require 'spec_helper'

module Polyamorous
  describe JoinAssociation do

    let(:join_dependency) { new_join_dependency Note, {} }
    let(:reflection) { Note.reflect_on_association(:notable) }
    let(:parent) { join_dependency.send(:join_root) }
    let(:join_association) {
      new_join_association(reflection, parent.children, Article)
    }

    subject { new_join_association(reflection, parent.children, Person) }

    it 'leaves the original reflection intact for thread safety' do
      reflection.instance_variable_set(:@klass, Article)
      join_association
      .swapping_reflection_klass(reflection, Person) do |new_reflection|
        expect(new_reflection.options).not_to equal reflection.options
        expect(new_reflection.options).not_to have_key(:polymorphic)
        expect(new_reflection.klass).to eq(Person)
        expect(reflection.klass).to eq(Article)
      end
    end

    it 'sets the polymorphic option to true after initializing' do
      expect(join_association.reflection.options[:polymorphic]).to be true
    end
  end
end