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	@chars = @remember_that_utf_16_is_variable_length;
    }
    return pack "$template*", ($do_bom ? 0xFEFF : ()), @chars;
}

sub test {
    my ($enc, $write, $expect, $bom, $nl, $name) = @_;
    open my $fh, ">", "utf$$.pl" or die "utf.pl: $!";
    binmode $fh;
    print $fh bytes_to_utf($enc, $write . ($nl ? "\n" : ''), $bom);
    close $fh or die $!;
    my $got = do "./utf$$.pl";
    $test = $test + 1;
    if (!defined $got) {
	if ($@ =~ /^(Unsupported script encoding \Q$enc\E)/) {
	    print "ok $test # skip $1\n";
        } else {
	    print "not ok $test # $enc $bom $nl $name; got undef\n";
	}
    } elsif ($got ne $expect) {
	print "not ok $test # $enc $bom $nl $name; got '$got'\n";
    } else {
	print "ok $test # $enc $bom $nl $name\n";
    }
}

for my $bom (0, 1) {
    for my $enc (qw(UTF-16LE UTF-16BE UTF-8)) {
	for my $nl (1, 0) {
	    for my $value (123, 1234, 12345) {
		test($enc, $value, $value, $bom, $nl, $value);
		# This has the unfortunate side effect of causing an infinite
		# loop without the bug fix it corresponds to:
		test($enc, "($value)", $value, $bom, $nl, "($value)");
	    }
	    next if $enc eq 'UTF-8';
	    # Arguably a bug that currently string literals from UTF-8 file
	    # handles are not implicitly "use utf8", but don't FIXME that
	    # right now, as here we're testing the input filter itself.

	    for my $expect (
		"N", "\x{010a}", "\x{0a23}", "\x{64321}", "\x{10FFFD}",
		"\x{1000a}", # 0xD800 0xDC0A
		"\x{12800}", # 0xD80A 0xDC00
		# explore a bunch of bit-width boundaries
		map { chr((1 << $_) - 1), chr(1 << $_) } 7 .. 20
	    ) {
		# A space so that the UTF-16 heuristic triggers - " '" gives two
		# characters of ASCII.
		my $write = " '$expect'";
		my $name = 'chrs ' . join ', ', map {sprintf "%#x", ord $_} split '', $expect;
		test($enc, $write, $expect, $bom, $nl, $name);
	    }

	    # This is designed to try to trip over the end of the buffer,
	    # with similar results to U-1000A and U-12800 above.
	    for my $pad (2 .. 162) {
		for my $chr ("\x{10000}", "\x{1000a}", "\x{12800}") {
		    my $padding = ' ' x $pad;
		    # Need 4 octets that were from 2 ASCII characters to trigger
		    # the heuristic that detects UTF-16 without a BOM. For
		    # UTF-16BE, one space and the newline will do, as the
		    # newline's high octet comes first. But for UTF-16LE, a
		    # newline is "\n\0", so it doesn't trigger it.
		    test($enc, "  \n$padding'$chr'", $chr, $bom, $nl,
			 sprintf "'\\x{%x}' with $pad spaces before it", ord $chr);
		}
	    }
	}
    }
}

END {
    1 while unlink "utf$$.pl";
}