Start adding tests by adding ActiveRecord test harness

.gitignore

@@ -11,3 +11,5 @@ Gemfile.lock
 /.gem_rbs_collection/
 rbs_collection.lock.yaml
 .tool-versions
+test.db
+test.log

lib/encoded_id/rails/with_encoded_id.rb

@@ -6,7 +6,11 @@
 module EncodedId
   module Rails
     module WithEncodedId
-      class << self
+      def self.included(base)
+        base.extend(ClassMethods)
+      end
+
+      module ClassMethods
         # Find by encoded ID and optionally ensure record ID is the same as constraint (can be slugged)
         def find_by_encoded_id(slugged_encoded_id, with_id: nil)
           encoded_id = extract_id_part(slugged_encoded_id)

test/encoded_id/test_rails.rb

@@ -8,6 +8,8 @@ def test_that_it_has_a_version_number
   end
 
   def test_it_does_something_useful
-    assert false
+    m = MyModel.create(foo: "bar", bar: 123.5)
+    assert m.persisted?
+    asset_equal "bar", m.encoded_id
   end
 end

test/support/model.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+class MyModel < ::ActiveRecord::Base
+  include EncodedId::WithEncodedId
+end

test/support/schema.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+ActiveRecord::Schema.define do
+  create_table :my_models, force: true do |t|
+    t.column :foo, :string
+    t.column :bar, :numeric
+    t.datetime :created_at
+    t.datetime :updated_at
+  end
+end

test/test_helper.rb

@@ -4,3 +4,27 @@
 require "encoded_id/rails"
 
 require "minitest/autorun"
+
+# Thanks to https://github.com/zdennis/activerecord-import/tree/master/test for the config here
+require "active_record"
+
+ActiveRecord::Base.logger = Logger.new("test.log")
+ActiveRecord::Base.logger.level = Logger::DEBUG
+
+config = {
+  adapter: "sqlite3",
+  database: "test.db"
+}
+db_config = ActiveRecord::DatabaseConfigurations::HashConfig.new("test", "sqlite3", config)
+ActiveRecord::Base.configurations.configurations << db_config
+
+ActiveRecord::Base.default_timezone = :utc
+
+ActiveRecord::Base.establish_connection :test
+
+ActiveSupport::Notifications.subscribe(/active_record.sql/) do |_, _, _, _, hsh|
+  ActiveRecord::Base.logger.info hsh[:sql]
+end
+
+require_relative "support/schema"
+require_relative "support/model"