File: where.t

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libmethod-signatures-perl 20170211-3
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#!/usr/bin/perl

use strict;
use warnings;

use Test::More;
use Test::Warn;
use Test::Exception;
use lib 't/lib';
use GenErrorRegex qw< required_placeholder_error placeholder_badval_error placeholder_failed_constraint_error >;

# Skip the test before Method::Signatures can try to compile it and blow up.
BEGIN {
    plan skip_all => "Perl 5.10.1 or higher required to test where constraints" if $] < 5.01001;
}

use Method::Signatures;


my $where_func = q{ func silly_test ($x where { $_ == 3 }) {} };
warning_is { eval $where_func } undef, 'no warnings for using smartmatch';


subtest 'where { block() }' => sub {
    plan tests => 3;

    func small_int (Maybe[Int] $x where { $_ < 10 } is copy = 0 when undef) {
        ok defined $x, "small_int($x) has defined value";
        ok $x < 10, "small_int($x) has value in range";
        return 1;
    }

    subtest "small_int()" => sub {
        ok  eval{ small_int();  }, "small_int() called as expected"
            or note $@;
    };

    subtest "small_int(9)" => sub {
        ok  eval{ small_int(9); }, "small_int(9) called as expected"
            or note $@;
    };

    subtest "small_int(10)" => sub {
        ok !eval{ small_int(10);}, "small_int(10) not called (as expected)";
        note $@;
    };
};


subtest 'where [0..10]' => sub {
    plan tests => 4;

    func range_int (Maybe[Int] $x where [0..9] is copy = 0 when undef) {
        ok defined $x, "range_int($x) has defined value";
        ok 0 <= $x && $x <= 9, "range_int($x) has value in range";
        return 1;
    }

    subtest "range_int()" => sub {
        ok  eval{ range_int();  }, "range_int() called as expected"
            or note $@;
    };

    subtest "range_int(9)" => sub {
        ok  eval{ range_int(9); }, "range_int(9) called as expected"
            or note $@;
    };

    subtest "range_int(10)" => sub {
        ok !eval{ range_int(10);}, "range_int(10) not called (as expected)";
        note $@;
    };

    subtest "range_int(-1)" => sub {
        ok !eval{ range_int(-1);}, "range_int(10) not called (as expected)";
        note $@;
    };
};


subtest 'where { cat => 1, dog => 2}' => sub {
    plan tests => 4;

    func hash_member (Maybe[Str] $x where { cat => 1, dog => 2 } is copy = 'cat' when undef) {
        ok defined $x, "hash_member($x) has defined value";
        like $x, qr{^(cat|dog)$} , "hash_member($x) has value in range";
        return 1;
    }

    subtest "hash_member()" => sub {
        ok  eval{ hash_member();  }, "hash_member() called as expected"
            or note $@;
    };

    subtest "hash_member('cat')" => sub {
        ok  eval{ hash_member('cat'); }, "hash_member('cat') called as expected"
            or note $@;
    };

    subtest "hash_member('dog')" => sub {
        ok  eval{ hash_member('dog'); }, "hash_member('dog') called as expected"
            or note $@;
    };

    subtest "hash_member('fish')" => sub {
        ok !eval{ hash_member('fish');}, "hash_member('fish') not called (as expected)";
        note $@;
    };
};


subtest 'where where where' => sub {
    no if $] >= 5.017011, warnings => 'experimental::smartmatch';
    plan tests => 14;

    func is_prime ($x) {
        return $x ~~ [2,3,5,7,11];
    }

    func neg_and_odd_and_prime ($x where [0..10] where { $x % 2 } where \&is_prime ) {
        ok $x ~~ [3,5,7], '$x had acceptable value';
        return 1;
    }

    for my $n (-1..11) {
        subtest "neg_and_odd_and_prime($n)" => sub {
            local $@;
            my $result = eval{ neg_and_odd_and_prime($n); };
            my $error  = $@;

            if (defined $result) {
                pass "neg_and_odd_and_prime($n) as expected";
            }
            else {
                like $error, qr{\$x value \("$n"\) does not satisfy constraint:}
                    => "neg_and_odd_and_prime($n) as expected";
                note $@;
            }
        };
    }

    # try an undef value
    my $result = eval{ neg_and_odd_and_prime(undef); };
    like $@, qr{\$x value \(undef\) does not satisfy constraint:}, "neg_and_odd_and_prime(undef) as expected";
};

subtest 'where with placeholders' => sub {
    func constrained_placeholder(Int $ where { $_ < 10 }) {
        pass 'placeholder passes constraints';
    }

    ok eval { constrained_placeholder(2) }, 'constrained_placeholder() called as expected'
        or note $@;

    # line 155
    throws_ok { constrained_placeholder() }
        required_placeholder_error('main', 0, 'constrained_placeholder', LINE => 156),
        'missing requierd constrained placeholder';
    throws_ok { constrained_placeholder('foo') }
        placeholder_badval_error('main', 0, 'Int' => 'foo', 'constrained_placeholder', LINE => 159),
        'placeholder value wrong type';
    throws_ok { constrained_placeholder(99) }
        placeholder_failed_constraint_error('main', 0, 99 => '{$_<10}', 'constrained_placeholder', LINE => 162),
        'placeholder value wrong type';
};

done_testing;