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# rt.cpan.org #41190: add_edge_by_id on multigraph malfunctioning
use strict;
use Test::More tests => 4;
use Graph;
my $G0 = Graph->new(undirected => 1,
vertices => ["v0", "v1", "v2"],
multiedged => 1);
$G0->add_edge_by_id("v0", "v1", "0");
is($G0, "v0=v1,v2");
my $G1 = Graph->new(undirected => 1,
vertices => ["v0", "v1", "v2"],
multiedged => 1);
$G1->add_edge_by_id("v0", "v1", "1");
is($G1, "v0=v1,v2");
my $G2 = Graph->new(undirected => 1,
vertices => ["v0", "v1", "v2"],
multiedged => 1);
$G2->add_edge_by_id("v0", "v0", "0");
is($G2, "v0=v0,v1,v2");
my $G3 = Graph->new(undirected => 1,
vertices => ["v0", "v1", "v2"],
multiedged => 1);
$G3->add_edge_by_id("v0", "v0", "1");
is($G3, "v0=v0,v1,v2");
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