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use strict; use warnings;
use Test::More tests => 28;
use Graph;
my $g1 = Graph->new;
ok ( !$g1->countvertexed );
my $g2 = Graph->new( countvertexed => 1 );
ok ( $g2->countvertexed );
is( $g2->vertices, 0 );
is( $g2->unique_vertices, 0 );
ok( $g2->add_vertex('a') );
is( $g2->vertices, 1 );
is( $g2->unique_vertices, 1 );
ok( $g2->add_vertex('a') );
is( $g2->vertices, 2 );
is( $g2->unique_vertices, 1 );
ok( $g2->add_vertex('b') );
is( $g2->vertices, 3 );
is( $g2->unique_vertices, 2 );
ok( $g2->add_vertex('a') );
is( $g2->vertices, 4 );
is( $g2->unique_vertices, 2 );
ok( $g2->delete_vertex('b') );
is( $g2->vertices, 3 );
is( $g2->unique_vertices, 1 );
ok( $g2->delete_vertex('a') );
is( $g2->vertices, 2 );
is( $g2->unique_vertices, 1 );
ok( $g2->delete_vertex('a') );
is( $g2->vertices, 1 );
is( $g2->unique_vertices, 1 );
is( $g2->delete_vertex('a'), "" );
is( $g2->vertices, 0 );
is( $g2->unique_vertices, 0 );
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