fails:Dir.mktmpdir when passed no arguments returns the path to the created tmp-dir
fails:Dir.mktmpdir when passed no arguments creates a new writable directory in the path provided by Dir.tmpdir
fails:Dir.mkdir when passed a block yields the path to the passed block
fails:Dir.mkdir when passed a block creates the tmp-dir before yielding
fails:Dir.mkdir when passed a block removes the tmp-dir after executing the block
fails:Dir.mkdir when passed a block returns the blocks return value
fails:Dir.mktmpdir when passed [String] uses the passed String as a prefix to the tmp-directory
fails:Dir.mktmpdir when passed [Array] uses the first element of the passed Array as a prefix and the scond element as a suffix to the tmp-directory
fails:Dir.mktmpdir when passed [Object] raises an ArgumentError
