# -*- tcl -*-
# Commands covered:	null
#
# This file contains a collection of tests for one or more of the commands
# the Memchan extension. Sourcing this file into Tcl runs the tests and
# generates output for errors.  No output means no errors were found.
#
# Copyright (c) 1999 Andreas Kupries (a.kupries@westend.com)
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
# $Id: null.test,v 1.1 2000/09/26 21:17:57 aku Exp $


test null-basic-1.0 {Create null devices} {
    set chan [null]
    close $chan
    regsub -all {[0-9]} $chan {} chan
    set chan
} {null}


test null-basic-1.1 {Check tell on null devices} {
    set chan [null]
    set res [tell $chan]
    close $chan
    set res
} {-1}


test null-basic-1.2 {Check seek on null devices} {
    set chan [null]
    catch {seek $chan 0} res
    close $chan
    regsub -all $chan $res XXX res
    set res
} {error during seek on "XXX": invalid argument}


test null-rw-1.0 {Write, length and tell} {
    set chan [null]
    puts -nonewline $chan {hello world}
    set res [tell $chan]
    close $chan
    set res
} {-1}

test null-rw-1.1 {Write and read} {
    set chan [null]
    puts -nonewline $chan {hello world!}
    set res [tell $chan]
    lappend res [read $chan]
    close $chan
    set res
} {-1 {}}