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use Test::More tests => 10;
use Graph;
my $g = Graph->new;
ok( !$g->has_edges() );
my $v = $g->edges;
is( $v, 0 );
my @v = $g->edges;
is( "@v", "" );
my ($e, @e);
$g->add_edge("a", "b");
$e = $g->edges;
is( $e, 1 );
@e = map { "[@$_]" } $g->edges;
is( "@e", "[a b]" );
$g->add_edge("b", "c");
$e = $g->edges;
is( $e, 2 );
@e = sort map { "[@$_]" } $g->edges;
is( "@e", "[a b] [b c]" );
eval '$g->add_edges("x")';
like($@, qr/Graph::add_edges: missing end vertex/);
is($g->add_edges("x", "y"), $g);
is($g, "a-b,b-c,x-y");
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