Tests added

test/dummy/app/models/dummy_model.rb

@@ -0,0 +1,2 @@
+class DummyModel < ApplicationRecord
+end

test/dummy/app/models/inherited_model.rb

@@ -0,0 +1,2 @@
+class InheritedModel < DummyModel
+end

test/dummy/app/models/missing_model.rb

@@ -0,0 +1,2 @@
+class MissingModel < ApplicationRecord
+end

test/dummy/db/migrate/20231222124254_create_dummy_models.rb

@@ -0,0 +1,8 @@
+class CreateDummyModels < ActiveRecord::Migration[7.1]
+  def change
+    create_table :dummy_models do |t|
+
+      t.timestamps
+    end
+  end
+end

test/dummy/db/schema.rb

@@ -0,0 +1,19 @@
+# This file is auto-generated from the current state of the database. Instead
+# of editing this file, please use the migrations feature of Active Record to
+# incrementally modify your database, and then regenerate this schema definition.
+#
+# This file is the source Rails uses to define your schema when running `bin/rails
+# db:schema:load`. When creating a new database, `bin/rails db:schema:load` tends to
+# be faster and is potentially less error prone than running all of your
+# migrations from scratch. Old migrations may fail to apply correctly if those
+# migrations use external dependencies or application code.
+#
+# It's strongly recommended that you check this file into your version control system.
+
+ActiveRecord::Schema[7.1].define(version: 2023_12_22_124254) do
+  create_table "dummy_models", force: :cascade do |t|
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
+end

test/rails_model_load_hook_test.rb

@@ -1,7 +1,57 @@
 require "test_helper"
+require 'minitest/autorun'
 
-class RailsModelLoadHookTest < ActiveSupport::TestCase
-  test "it has a version number" do
-    assert RailsModelLoadHook::VERSION
-  end
+describe RailsModelLoadHook do
+	let(:loaded)  { [] }
+	let(:on_load) { -> { loaded << _1 } }
+
+	before do
+		on_load = self.on_load
+
+		ActiveSupport.on_load :model_class do
+			on_load[self]
+		end
+	end
+
+	module SharedExamples
+		refine Minitest::Spec.singleton_class do
+			def passing
+				it 'passes the hook' do
+					_(loaded).must_include model
+				end
+			end
+
+			def skipping
+				it 'skips the hook' do
+					_(loaded).wont_include model
+				end
+			end
+		end
+	end
+
+	using SharedExamples
+
+	describe 'with existing models' do
+		let(:model) { DummyModel.tap { _1.new } }
+
+		passing
+	end
+
+	describe 'with inherited models' do
+		let(:model) { InheritedModel.tap { _1.new } }
+
+		passing
+	end
+
+	describe 'with ApplicationRecord' do
+		let(:model) { ApplicationRecord }
+
+		skipping
+	end
+
+	describe 'with models lacking DB tables' do
+		let(:model) { MissingModel }
+
+		skipping
+	end
 end