unless.t

use v6;

use Test;

plan 9;

# test the unless statement modifier

# L<S04/"Conditional statements"/Conditional statement modifiers work as in Perl 5>
{
    my $a = 1;
    $a = 4 unless 'a' eq 'a';
    is($a, 1, "post unless");
}

{
    my $a = 1;
    $a = 5 unless 'a' eq 'b';
    is($a, 5, "post unless");
}

{
        my $answer = 1;
        my @x = 41, (42 unless $answer), 43;
        my @y = 41, (!$answer ?? 42 !! Slip.new()), 43;
        my @z = 41, 43;
        is @y, @z, "sanity check";
        is @x, @y, "unless expr on true cond";
}

{
        my $answer = 0;
        my @x = 41, (42 unless $answer), 43;
        my @y = 41, (!$answer ?? 42 !! Slip.new()), 43;
        my @z = 41, 42, 43;
        is @y, @z, "sanity check";
        is @x, @y, "unless expr on false cond";
}

{
    my $a = 'oops';
    { $a = 'ok' } unless 0;
    is $a, 'ok', 'Statement-modifier unless runs bare block';
}

{
    my $a = 'oops';
    { $a = $^x } unless 0;
    is $a, 0, 'Statement-modifier unless runs block with placeholder';
}

# RT #79174
{
    is (1,2, unless 0), "1 2", "unless is a terminator even after comma";
}

# vim: ft=perl6