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Testing Version Association Implementation in PaperTrail

This test suite validates the versioning functionality in the PaperTrail gem’s Thing model, focusing on version association scoping and extension behaviors. The tests ensure proper version ordering and custom inspection formatting.

Test Coverage Overview

The test suite provides coverage for the Thing model’s version association implementation.

Key areas tested include:

Version association scope configuration and ordering
Custom version inspection behavior through extensions
Association reflection validation

Implementation Analysis

The testing approach uses RSpec’s describe/it blocks to isolate version association behaviors.

Notable patterns include:

Use of let blocks for test subject creation
SQL query validation for scope implementation
Singleton class extension verification
Custom module inclusion testing

Technical Details

Testing infrastructure includes:

RSpec as the testing framework
PaperTrail versioning configuration
Custom PrefixVersionsInspectWithCount module
Model-level version association setup

Best Practices Demonstrated

The test suite exhibits several testing best practices:

Isolated test contexts using RSpec describe blocks
Clear test case separation and naming
Efficient test subject setup using let helpers
Explicit expectation verification
Association-specific testing patterns

paper-trail-gem/paper_trail

spec/models/thing_spec.rb

            
# frozen_string_literal: true

require "spec_helper"

RSpec.describe Thing, type: :model do
  describe "#versions", versioning: true do
    let(:thing) { described_class.create! }

    it "applies the scope option" do
      expect(described_class.reflect_on_association(:versions).scope).to be_a Proc
      expect(thing.versions.to_sql).to end_with "ORDER BY id desc"
    end

    it "applies the extend option" do
      expect(thing.versions.singleton_class).to be < PrefixVersionsInspectWithCount
      expect(thing.versions.inspect).to start_with("1 versions:")
    end
  end
end