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Testing Update Event Version Management in PaperTrail

This test suite examines the update functionality in the PaperTrail gem’s versioning system. It focuses on verifying version record creation during model updates and custom event handling. The tests ensure proper behavior for update events, custom event naming, and touch operations.

Test Coverage Overview

The test suite provides comprehensive coverage of the Update model’s versioning behavior.

Validates single version record creation for update events
Tests custom event name persistence
Verifies touch operation behavior
Ensures proper version count management

Implementation Analysis

The testing approach utilizes RSpec’s behavior-driven development patterns with focused contexts and expectations.

Uses described_class for flexible test subject reference
Implements change matcher for state verification
Employs versioning: true flag for PaperTrail integration
Utilizes expect blocks for precise assertion control

Technical Details

RSpec testing framework
PaperTrail versioning system
Model-level unit testing
Dependency injection via require_dependency
Frozen string literal pragma

Best Practices Demonstrated

The test suite exemplifies clean testing practices with clear separation of concerns and focused test cases.

Isolated test scenarios
Descriptive context naming
Explicit expectations
Proper setup and teardown management
Consistent testing patterns

paper-trail-gem/paper_trail

spec/models/on/update_spec.rb

            
# frozen_string_literal: true

require "spec_helper"
require_dependency "on/update"

module On
  RSpec.describe Update, type: :model, versioning: true do
    describe "#versions" do
      it "only creates one version record, for the update 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("update"))
      end
    end

    describe "#paper_trail_event" do
      it "rembembers the custom event name" do
        record = described_class.create(name: "Alice")
        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