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Testing Paperclip::Glue Module Integration in thoughtbot/paperclip

This test suite examines the Paperclip::Glue module’s compatibility with both ActiveRecord and non-ActiveRecord environments. It ensures the module can be safely included in different contexts without causing failures or dependencies issues.

Test Coverage Overview

The test suite provides comprehensive coverage of Paperclip::Glue module integration scenarios.

Key areas tested include:

Behavior when ActiveRecord is not present in the environment
Functionality when ActiveRecord exists
Safe inclusion of the Glue module in non-ActiveRecord models

Implementation Analysis

The testing approach uses RSpec’s describe blocks to isolate different environmental conditions. The implementation employs careful management of Ruby constants through dynamic manipulation, ensuring clean test isolation.

Notable patterns include:

Constant management using remove_const
Class generation using Class.new
Module inclusion testing with send :include

Technical Details

Testing infrastructure includes:

RSpec as the testing framework
Ruby’s Object and Module system manipulation
Dynamic constant management
Before/After hooks for environment setup and teardown

Best Practices Demonstrated

The test suite exemplifies several testing best practices.

Notable examples include:

Proper test isolation through environment manipulation
Clean setup and teardown of test conditions
Clear separation of test scenarios
Effective use of RSpec’s context management

thoughtbot/paperclip

spec/paperclip/glue_spec.rb

            
# require "spec_helper"

describe Paperclip::Glue do
  describe "when ActiveRecord does not exist" do
    before do
      ActiveRecordSaved = ActiveRecord
      Object.send :remove_const, "ActiveRecord"
    end

    after do
      ActiveRecord = ActiveRecordSaved
      Object.send :remove_const, "ActiveRecordSaved"
    end

    it "does not fail" do
      NonActiveRecordModel = Class.new
      NonActiveRecordModel.send :include, Paperclip::Glue
      Object.send :remove_const, "NonActiveRecordModel"
    end
  end

  describe "when ActiveRecord does exist" do
    before do
      if Object.const_defined?("ActiveRecord")
        @defined_active_record = false
      else
        ActiveRecord = :defined
        @defined_active_record = true
      end
    end

    after do
      if @defined_active_record
        Object.send :remove_const, "ActiveRecord"
      end
    end

    it "does not fail" do
      NonActiveRecordModel = Class.new
      NonActiveRecordModel.send :include, Paperclip::Glue
      Object.send :remove_const, "NonActiveRecordModel"
    end
  end
end