} -returnCodes 1 -result {unknown encoding "foobar"}
test io-39.16a {Tcl_SetChannelOption: -encoding (invalid shortening to "-e"), errors} -body {
    file delete $path(test1)
    set f [open $path(test1) w]
    fconfigure $f -e foobar
} -cleanup {
    close $f
} -returnCodes 1 -result {bad option "-e": should be one of -blocking, -buffering, -buffersize, -encoding, -eofchar, or -translation}
} -returnCodes 1 -match glob -result {bad option "-e": should be one of *}
test io-39.17 {Tcl_SetChannelOption: -encoding, clearing CHANNEL_NEED_MORE_DATA} {stdio fileevent} {
    set f [open "|[list [interpreter] $path(cat)]" r+]
    fconfigure $f -encoding binary
    puts -nonewline $f "\xE7"
    flush $f
    fconfigure $f -encoding utf-8 -blocking 0
    variable x {}