adds simple spec about being able to pass in a AR model as :db

spec/database_cleaner/active_record/base_spec.rb

@@ -3,6 +3,12 @@ require 'active_record'
 require 'database_cleaner/active_record/base'
 require 'database_cleaner/shared_strategy'
 
+class FakeModel
+  def self.connection
+    :fake_connection
+  end
+end
+
 module DatabaseCleaner
   describe ActiveRecord do
     it { should respond_to(:available_strategies) }
@@ -121,6 +127,11 @@ my_db:
           subject.connection_class.should == ::ActiveRecord::Base
         end
 
+        it "allows for database models to be passed in" do
+          subject.db = FakeModel
+          subject.connection_class.should == FakeModel
+        end
+
         context "when connection_hash is set" do
           let(:hash) { mock("hash") }
           before { ::ActiveRecord::Base.stub!(:respond_to?).and_return(false)}