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use Test::More tests => 16;
use Graph;
my $g = Graph->new;
$g->add_edge("a", "b");
$g->add_edge("b", "c");
$g->add_edge("c", "d");
$g->add_edge("d", "d");
$g->add_edge("e", "b");
$g->add_edge("c", "f");
$g->add_edge("c", "g");
$g->add_edge("g", "h");
$g->add_edge("h", "g");
sub to {
join(" ", sort map { "[" . join(" ", map { ref $_ ? "[@$_]" : $_ } @$_) . "]" } $g->edges_to(@_));
}
is( to("a"), "");
is( to("b"), "[a b] [e b]");
is( to("c"), "[b c]");
is( to("d"), "[c d] [d d]");
is( to("e"), "");
is( to("f"), "[c f]");
is( to("g"), "[c g] [h g]");
is( to("h"), "[g h]");
is( to("x"), "");
{
use Graph::Directed;
my $g1 = new Graph::Directed();
$g1->add_edge(0,0);
my @e = $g1->edges_to(0);
is(@e, 1);
is("@{ $e[0] }", "0 0");
}
{
my $g2 = new Graph::Directed();
$g2->add_edge(1,1);
$g2->add_edge(1,2);
my @e1 = $g2->edges_to(1);
is(@e1, 1);
is("@{ $e1[0] }", "1 1");
my @e2 = $g2->edges_to(2);
is(@e2, 1);
is("@{ $e2[0] }", "1 2");
my @e3 = $g2->edges_to(3);
is(@e3, 0);
}
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