module MiniTest::Unit::Guard

def jruby? platform = RUBY_PLATFORM
  "java" == platform
end

def maglev? platform = defined?(RUBY_ENGINE) && RUBY_ENGINE
  "maglev" == platform
end

def mri? platform = RUBY_DESCRIPTION
  /^ruby/ =~ platform
end

def rubinius? platform = defined?(RUBY_ENGINE) && RUBY_ENGINE
  "rbx" == platform
end

def windows? platform = RUBY_PLATFORM
  /mswin|mingw/ =~ platform
end