File: 13_add_vertex.t

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libgraph-perl 1%3A0.9726-1
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use strict; use warnings;
use Test::More tests => 6;

use Graph;
my $g = Graph->new;

ok( $g->add_vertex("a") );
ok( $g->add_vertex("b") );

is( $g->add_vertex("c"), $g );

eval { $g->add_vertex(undef) };
like($@,
     qr/Graph::add_vertex: undef vertex/);

is( $g->add_vertices("x", "y"), $g );

is( $g, "a,b,c,x,y" );