Add test demonstrating namespace

Demonstrates changes to docs in
https://github.com/airblade/paper_trail/pull/559

spec/models/kitchen/banana_spec.rb

@@ -0,0 +1,14 @@
+require 'rails_helper'
+
+module Kitchen
+  describe Banana, :type => :model do
+    it { is_expected.to be_versioned }
+
+    describe '#versions' do
+      it "returns instances of Kitchen::BananaVersion", :versioning => true do
+        banana = described_class.create!
+        expect(banana.versions.first).to be_a(Kitchen::BananaVersion)
+      end
+    end
+  end
+end

test/dummy/app/models/kitchen/banana.rb

@@ -0,0 +1,5 @@
+module Kitchen
+  class Banana < ActiveRecord::Base
+    has_paper_trail :class_name => "Kitchen::BananaVersion"
+  end
+end

test/dummy/app/versions/kitchen/banana_version.rb

@@ -0,0 +1,5 @@
+module Kitchen
+  class BananaVersion < PaperTrail::Version
+    self.table_name = 'banana_versions'
+  end
+end

test/dummy/db/migrate/20110208155312_set_up_test_tables.rb

@@ -73,6 +73,20 @@ class SetUpTestTables < ActiveRecord::Migration
       add_index :json_versions, [:item_type, :item_id]
     end
 
+    create_table :bananas, :force => true do |t|
+      t.timestamps :null => true
+    end
+
+    create_table :banana_versions, :force => true do |t|
+      t.string   :item_type, :null => false
+      t.integer  :item_id,   :null => false
+      t.string   :event,     :null => false
+      t.string   :whodunnit
+      t.text     :object
+      t.datetime :created_at
+    end
+    add_index :banana_versions, [:item_type, :item_id]
+
     create_table :wotsits, :force => true do |t|
       t.integer :widget_id
       t.string  :name