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Testing Proxyable Module Configuration in rails_admin

This test suite validates the Proxyable module functionality in Rails Admin, focusing on method proxying and thread safety. The tests ensure proper binding management and method delegation while maintaining thread-safe operations in a Rails environment.

Test Coverage Overview

The test suite provides comprehensive coverage of the RailsAdmin::Config::Proxyable module functionality.

Key areas tested include:

Method proxying to bound objects
Binding preservation across method calls
Kernel method conflict resolution
Thread safety in parallel execution

Implementation Analysis

The testing approach employs RSpec’s behavior-driven development patterns to verify proxy functionality. The implementation uses class-based test fixtures with careful attention to method binding and execution context.

Notable patterns include:

Context isolation for Kernel method testing
Thread-based parallel execution testing
Binding state verification

Technical Details

Testing tools and configuration:

RSpec as the testing framework
Custom ProxyableTest class for test scenarios
Thread manipulation for concurrency testing
Kernel module manipulation for method conflict testing

Best Practices Demonstrated

The test suite exemplifies several testing best practices for Ruby and Rails applications.

Notable practices include:

Proper test isolation and cleanup
Comprehensive edge case coverage
Thread safety verification
Clear test organization and naming

railsadminteam/rails_admin

spec/rails_admin/config/proxyable_spec.rb

            
# frozen_string_literal: true

require 'spec_helper'

RSpec.describe RailsAdmin::Config::Proxyable do
  class ProxyableTest
    include RailsAdmin::Config::Proxyable

    def boo
      sleep 0.15
      bindings[:foo]
    end

    def qux
      'foobar'
    end
  end

  let!(:proxyable_test) { ProxyableTest.new }
  subject do
    proxyable_test.bindings = {foo: 'bar'}
    proxyable_test
  end

  it 'proxies method calls to @object' do
    expect(subject.bindings).to eq foo: 'bar'
  end

  it 'preserves initially set @bindings' do
    expect(subject.with(foo: 'baz').tap(&:qux).bindings).to eq foo: 'bar'
  end

  context 'when a method is defined in Kernel' do
    before do
      Kernel.module_eval do
        def qux
          'quux'
        end
      end
    end

    after do
      Kernel.module_eval do
        undef qux
      end
    end

    it 'proxies calls for the method to @object' do
      expect(subject.qux).to eq 'foobar'
    end
  end

  describe 'with parallel execution' do
    it 'ensures thread-safety' do
      threads = Array.new(2) do |i|
        Thread.new do
          value = %w[a b][i]
          proxy = proxyable_test.with foo: value
          sleep i * 0.1
          expect(proxy.boo).to eq value
        end
      end
      threads.each(&:join)
    end
  end
end