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use Test::More tests => 16;
use Graph;
my $g = Graph->new;
ok( !$g->has_edge("a", "b") );
ok( !$g->has_edge("b", "c") );
ok( !$g->has_edge("a", "b") );
ok( !$g->has_edge("b", "c") );
ok(!$g->has_edge(0));
ok(!$g->has_edge(1));
ok(!$g->has_edge(0, 0));
ok(!$g->has_edge(0, 1));
ok(!$g->has_edge(1, 0));
ok(!$g->has_edge(1, 1));
$g->add_edge(0, 1);
ok(!$g->has_edge(0));
ok(!$g->has_edge(1));
ok(!$g->has_edge(0, 0));
ok( $g->has_edge(0, 1));
ok(!$g->has_edge(1, 0));
ok(!$g->has_edge(1, 1));
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