module FakeFS::FileTest

def directory?(file_name)
  File.directory?(file_name)
end

def executable?(file_name)
  File.executable?(file_name)
end

def exist?(file_name)
  File.exist?(file_name)
end

def file?(file_name)
  File.file?(file_name)
end

def readable?(file_name)
  File.readable?(file_name)
end

def size?(file_name)
  File.size?(file_name)
end

def sticky?(file_name)
  File.sticky?(file_name)
end

def symlink?(file_name)
  File.symlink?(file_name)
end

def world_readable?(file_name)
  File.new(file_name).stat.world_readable?
end

def world_writable?(file_name)
  File.new(file_name).stat.world_writable?
end

def writable?(file_name)
  File.writable?(file_name)
end

def zero?(file_name)
  File.zero?(file_name)
end