test: test inside a dummy app.

[seuros]

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[Copilot]

Pull Request Overview

This PR adds a dummy Rails application for integration tests, refactors existing test suites for consistency, and streamlines dependency and CI configuration.

• Introduce a test/dummy Rails app with models, controller, and Rakefile for engine testing
• Rename and refactor closure_tree tests (e.g. UUIDTag→UuidTag, RSpec→Minitest conversions, shared examples signature)
• Remove legacy Appraisals and gemfiles, update Gemfile and GitHub Actions workflows to use an ENV-driven Rails matrix and bin/rails test

Reviewed Changes

Copilot reviewed 53 out of 53 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/dummy/app/models/application_record.rb	Added ApplicationRecord skeleton with primary DB connection
test/dummy/app/models/adamantium.rb	Introduced dummy Adamantium model
test/dummy/app/controllers/application_controller.rb	Added ApplicationController with CSRF protection
test/dummy/Rakefile	Set up dummy app’s Rake tasks
test/closure_tree/uuid_tag_test.rb	Renamed UUIDTag → UuidTag
test/closure_tree/user_test.rb	Cleared User and hierarchy tables in before hook
test/closure_tree/tag_test.rb	Converted describe Tag to TagTest class and set TAG_CLASS
test/closure_tree/matcher_test.rb	Updated matcher tests to use UuidTag
test/closure_tree/label_test.rb	Refactored CorrectOrderValue.shared_examples signature
test/closure_tree/label_order_value_test.rb	Added new tests for order_value behavior
gemfiles/activerecord_*.gemfile	Removed legacy appraisal-generated gemfiles
Appraisals	Removed outdated Appraisals file
closure_tree.gemspec	Dropped the appraisal dev dependency
Gemfile	Centralized rails/gem dependencies and introduced ENV-driven logic
.github/workflows/ci_truffleruby.yml	Removed obsolete CI config
.github/workflows/ci_jruby.yml	Removed obsolete CI config
.github/workflows/ci.yml	Updated matrix to Ruby 3.4/JRuby/TruffleRuby and revised test steps

Comments suppressed due to low confidence (2)

test/closure_tree/tag_test.rb:8

• [nitpick] Indent include TagExamples with two spaces (instead of four) to match the two-space class-body indentation and keep style consistent.

    include TagExamples

.github/workflows/ci.yml:83

• The workflow no longer sets a single DATABASE_URL or DB_ADAPTER for the test suite. Ensure the CI job sets DATABASE_URL (e.g. from one of the DATABASE_URL_* vars) or update the test configuration to read the new per-adapter env vars so tests connect to the intended database.

run: bin/rails test

[Copilot]

[nitpick] Consider grouping test-only dependencies like railties and the database adapters under group :development, :test to avoid loading them in production environments.

Suggested change

gem 'railties'