require 'adapter/mongo'
key     = BSON::ObjectId.new
client  = Mongo::MongoClient.new.db('adapter')['testing']
adapter = Adapter[:mongo].new(client)
adapter.clear
adapter.write(key, {'some' => 'thing'})
puts 'Should be {"some" => "thing"}: ' + adapter.read(key).inspect
adapter.delete(key)
puts 'Should be nil: ' + adapter.read(key).inspect
adapter.write(key, {'some' => 'thing'})
adapter.clear
puts 'Should be nil: ' + adapter.read(key).inspect
puts 'Should be {"some" => "thing"}: ' + adapter.fetch(key, {'some' => 'thing'}).inspect

require 'adapter/mongo_atomic'
key            = BSON::ObjectId.new
full_doc       = {'a' => 'c', 'b' => 'd'}
partial_doc    = {'a' => 'z'}
client         = Mongo::MongoClient.new.db('adapter')['testing']
adapter        = Adapter[:mongo].new(client)
atomic_adapter = Adapter[:mongo_atomic].new(client)
adapter.clear
atomic_adapter.clear
adapter.write(key, full_doc)
adapter.write(key, partial_doc)
doc = adapter.read(key)
doc.delete('_id')
# full doc must always be written with :mongo adapter
puts 'Should be {"a"=>"z"}: ' + doc.inspect
atomic_adapter.write(key, full_doc)
atomic_adapter.write(key, partial_doc)
doc = atomic_adapter.read(key)
doc.delete('_id')
# partial updates can be written with atomic adapter as $set is used
puts 'Should be {"a"=>"z", "b"=>"d"}: ' + doc.inspect