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Testing Create-Only Version Tracking in PaperTrail

This test suite evaluates the PaperTrail gem’s On::Create functionality, focusing on version tracking during object creation events. It verifies version management behavior and custom event handling in create-only scenarios.

Test Coverage Overview

The test suite provides comprehensive coverage of version creation behaviors in PaperTrail’s On::Create module.

Key areas tested include:

Version creation limited to create events
Custom event name handling
Touch operation version management

Edge cases cover scenarios where updates and destroys should not create additional versions.

Implementation Analysis

The testing approach employs RSpec’s describe/it blocks to organize related test cases logically. The implementation uses RSpec’s expectation syntax with precise assertions for version counts and event names.

Notable patterns include:

Versioning flag usage in RSpec metadata
Described_class reference for test subject
Change matcher for behavioral verification

Technical Details

Testing infrastructure includes:

RSpec as the testing framework
PaperTrail gem integration
Spec helper configuration
Model-type tests with versioning support
Dependency management for On::Create module

Best Practices Demonstrated

The test suite exemplifies high-quality testing practices through well-structured test organization and clear expectations.

Notable practices include:

Isolated test scenarios
Explicit state verification
Focused test scope
Clear test case naming
Proper setup and teardown management

paper-trail-gem/paper_trail

spec/models/on/create_spec.rb

            
# frozen_string_literal: true

require "spec_helper"
require_dependency "on/create"

module On
  RSpec.describe Create, type: :model, versioning: true do
    describe "#versions" do
      it "only have a version for the create event" do
        record = described_class.create(name: "Alice")
        record.update(name: "blah")
        record.destroy
        expect(record.versions.length).to(eq(1))
        expect(record.versions.last.event).to(eq("create"))
      end
    end

    describe "#paper_trail_event" do
      it "rembembers the custom event name" do
        record = described_class.new
        record.paper_trail_event = "banana"
        record.update(name: "blah")
        record.destroy
        expect(record.versions.length).to(eq(1))
        expect(record.versions.last.event).to(eq("banana"))
      end
    end

    describe "#touch" do
      it "does not create a version" do
        record = described_class.create(name: "Alice")
        expect { record.touch }.not_to(
          change { record.versions.count }
        )
      end
    end
  end
end