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

gem 'dm-core',        '0.10.0'
gem 'dm-validations', '0.10.0'

require 'dm-core'
require 'dm-validations'

ROOT = Pathname(__FILE__).dirname.parent

# use local dm-adjust if running from dm-more directly
lib = ROOT.parent / 'dm-types' / 'lib'
$LOAD_PATH.unshift(lib) if lib.directory?

require ROOT / 'lib' / 'dm-is-remixable'

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

  begin
    DataMapper.setup(:default, ENV["#{name.to_s.upcase}_SPEC_URI"] || default_uri)
    DataMapper::Repository.adapters[name] = 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')
```

Use the local dm-validations gem in specs if available
user
```ruby
require 'pathname'
require 'rubygems'

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

ROOT = Pathname(__FILE__).dirname.parent

# use local dm-validations if running from dm-more directly
lib = ROOT.parent / 'dm-validations' / 'lib'
$LOAD_PATH.unshift(lib) if lib.directory?
require 'dm-validations'

# use local dm-adjust if running from dm-more directly
lib = ROOT.parent / 'dm-types' / 'lib'
$LOAD_PATH.unshift(lib) if lib.directory?

require ROOT / 'lib' / 'dm-is-remixable'

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

  begin
    DataMapper.setup(:default, ENV["#{name.to_s.upcase}_SPEC_URI"] || default_uri)
    DataMapper::Repository.adapters[name] = 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')
```
assistant