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Testing ActiveRecord Version Compatibility Checks in PaperTrail

This test suite validates PaperTrail’s compatibility checks with different ActiveRecord versions. It ensures proper warning mechanisms when incompatible versions are detected and verifies silent operation with supported versions.

Test Coverage Overview

The test coverage focuses on PaperTrail’s version compatibility validation system, specifically testing the check_activerecord functionality.

Tests compatibility checks with supported ActiveRecord version 6.1.0
Verifies warning behavior with unsupported version 8.1.0
Ensures proper stderr output handling

Implementation Analysis

The testing approach uses RSpec’s context-based structure to separate compatible and incompatible version scenarios. It leverages RSpec’s output matchers to verify stderr behavior and employs Gem::Version for version comparison testing.

Uses described_class pattern for better maintainability
Implements expect blocks for output verification
Utilizes context blocks for logical test organization

Technical Details

RSpec testing framework
Gem::Version for version comparison
Output matchers for stderr validation
Frozen string literal pragma
Module-based test organization

Best Practices Demonstrated

The test suite demonstrates excellent separation of concerns and clear test organization through well-structured contexts and descriptions.

Clear test case isolation
Explicit version testing
Proper error output validation
Clean and maintainable test structure

paper-trail-gem/paper_trail

spec/paper_trail/compatibility_spec.rb

            
# frozen_string_literal: true

module PaperTrail
  ::RSpec.describe(Compatibility) do
    describe ".check_activerecord" do
      context "when compatible" do
        it "does not produce output" do
          ar_version = ::Gem::Version.new("6.1.0")
          expect {
            described_class.check_activerecord(ar_version)
          }.not_to output.to_stderr
        end
      end

      context "when incompatible" do
        it "writes a warning to stderr" do
          ar_version = ::Gem::Version.new("8.1.0")
          expect {
            described_class.check_activerecord(ar_version)
          }.to output(/not compatible/).to_stderr
        end
      end
    end
  end
end