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use Graph;
use strict;
local $^W = 1;
print "1..10\n";
my $g = new Graph;
$g->add_edge('a', 'b');
$g->add_edge('b', 'c');
$g->add_edge('a', 'd');
$g->add_vertex('e');
my $h = $g->copy;
print "not " unless $g->vertices == $h->vertices;
print "ok 1\n";
print "not " unless join(" ", sort $h->vertices) eq "a b c d e";
print "ok 2\n";
print "not " unless $g->edges == $h->edges;
print "ok 3\n";
print "not " unless join(" ", $h->edges) eq "a b a d b c";
print "ok 4\n";
$g->delete_vertex('e');
print "not " unless join(" ", $h->vertices) eq "a b c d e";
print "ok 5\n";
print "not " unless join(" ", $h->edges) eq "a b a d b c";
print "ok 6\n";
$g->delete_vertex('b');
print "not " unless join(" ", $h->vertices) eq "a b c d e";
print "ok 7\n";
print "not " unless join(" ", $h->edges) eq "a b a d b c";
print "ok 8\n";
$g->delete_edge('a', 'b');
print "not " unless join(" ", $h->vertices) eq "a b c d e";
print "ok 9\n";
print "not " unless join(" ", $h->edges) eq "a b a d b c";
print "ok 10\n";
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