ext/IO/t/io_const.t See if constants from IO work
ext/IO/t/io_dir.t See if directory-related methods from IO work
ext/IO/t/io_dup.t See if dup()-related methods from IO work
+ext/IO/t/io_file.t See if binmode()-related methods on IO::File work
ext/IO/t/io_linenum.t See if I/O line numbers are tracked correctly
ext/IO/t/io_multihomed.t See if INET sockets work with multi-homed hosts
ext/IO/t/io_pipe.t See if pipe()-related methods from IO work