```ruby
require 'pathname'
require 'rubygems'

gem 'rspec', '>1.1.12'
require 'spec'

gem 'dm-core', '0.10.0'
require 'dm-core'

ROOT = Pathname(__FILE__).dirname.parent.expand_path

require ROOT + 'lib/dm-validations'

def load_driver(name, default_uri)
  return false if ENV['ADAPTER'] != name.to_s

  begin
    DataMapper.setup(name, ENV["#{name.to_s.upcase}_SPEC_URI"] || default_uri)
    DataMapper::Repository.adapters[:default] =  DataMapper::Repository.adapters[name]
    true
  rescue LoadError => e
    warn "Could not load do_#{name}: #{e}"
    false
  end
end

ENV['ADAPTER'] ||= 'sqlite3'

HAS_SQLITE3  = load_driver(:sqlite3,  'sqlite3::memory:')
HAS_MYSQL    = load_driver(:mysql,    'mysql://localhost/dm_core_test')
HAS_POSTGRES = load_driver(:postgres, 'postgres://postgres@localhost/dm_core_test')

Dir[ROOT + 'spec/integration/shared/**/*.rb'].each { |rb| require(rb) }
Dir[ROOT + 'spec/fixtures/**/*.rb'].each { |rb| require(rb) }
```

Remove rubygems usage from libraries
user
```ruby
require 'pathname'
require 'rubygems'

gem 'dm-core', '0.10.0'
require 'dm-core'

ROOT = Pathname(__FILE__).dirname.parent

require ROOT / 'lib' / 'dm-validations'

def load_driver(name, default_uri)
  return false if ENV['ADAPTER'] != name.to_s

  begin
    DataMapper.setup(name, ENV["#{name.to_s.upcase}_SPEC_URI"] || default_uri)
    DataMapper::Repository.adapters[:default] =  DataMapper::Repository.adapters[name]
    true
  rescue LoadError => e
    warn "Could not load do_#{name}: #{e}"
    false
  end
end

ENV['ADAPTER'] ||= 'sqlite3'

HAS_SQLITE3  = load_driver(:sqlite3,  'sqlite3::memory:')
HAS_MYSQL    = load_driver(:mysql,    'mysql://localhost/dm_core_test')
HAS_POSTGRES = load_driver(:postgres, 'postgres://postgres@localhost/dm_core_test')

Dir[ROOT / 'spec' / 'integration' / 'shared' / '**' / '*.rb'].each { |rb| require(rb) }
Dir[ROOT / 'spec' / 'fixtures' / '**' / '*.rb'].each { |rb| require(rb) }
```
assistant