add activerecord nulldb adapter

create model and schema for support
basic activerecord functionality spec

Author: mach-kernel

api-pagination.gemspec

@@ -21,4 +21,5 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'railties', '>= 3.0.0'
   s.add_development_dependency 'actionpack', '>= 3.0.0'
   s.add_development_dependency 'sequel', '>= 4.9.0'
+  s.add_development_dependency 'activerecord-nulldb-adapter', '>= 0.3.8'
 end

spec/active_record_spec.rb

@@ -0,0 +1,20 @@
+require 'spec_helper'
+require 'support/active_record/foo'
+require 'nulldb_rspec'
+
+ActiveRecord::Base.establish_connection(
+  adapter: :nulldb,
+  schema: 'support/active_record/schema'
+)
+
+describe 'using kaminari with active_record' do
+  let(:collection) { Foo.all }
+  let(:per_page) { 5 }
+
+  it 'produces correct sql for first page' do
+    paginated_sql = ApiPagination.paginate(collection, per_page: per_page)
+                                 .to_sql
+
+    expect(paginated_sql).to eql(Foo.limit(per_page).offset(0).to_sql)
+  end
+end

spec/support/active_record/foo.rb

@@ -0,0 +1,3 @@
+require 'active_record'
+
+class Foo < ActiveRecord::Base; end

spec/support/active_record/schema.rb

@@ -0,0 +1,5 @@
+ActiveRecord::Schema.define(version: 0) do
+  create_table "foos", :force => true do |t|
+    t.string   "foo"
+  end
+end