function test_number_of_resources_remains_constant_after_skolemise_bnodes()
{
$graph = new SimpleGraph(file_get_contents(dirname(__FILE__) . '/documents/ckan-ds.ttl'));
$index = $graph->get_index();
$before = count($graph->get_subjects());
$graph->skolemise_bnodes('http://example.com/test/');
$after = count($graph->get_subjects());
$this->assertEquals($before, $after, "skolemise_bnodes shouldn't reduce the number of resources");
}
function test_get_subjects()
{
$g = new SimpleGraph();
$g->add_resource_triple('http://example.org/subj1', 'http://www.w3.org/1999/02/22-rdf-syntax-ns#type', 'http://example.org/type_1');
$g->add_resource_triple('http://example.org/subj2', 'http://www.w3.org/1999/02/22-rdf-syntax-ns#type', 'http://example.org/type_2');
$g->add_resource_triple('http://example.org/subj3', 'http://www.w3.org/1999/02/22-rdf-syntax-ns#type', 'http://example.org/type_1');
$g->add_literal_triple('http://example.org/subj4', 'http://www.w3.org/1999/02/22-rdf-syntax-ns#type', 'http://example.org/type_1');
$subjects = $g->get_subjects();
$this->assertEquals(4, count($subjects), 'The returned subjects should be exactly 4');
$this->assertContains('http://example.org/subj1', $subjects, 'subj1 matches and should be returned');
$this->assertContains('http://example.org/subj2', $subjects, 'subj2 matches and should be returned');
$this->assertContains('http://example.org/subj3', $subjects, 'subj3 matches and should be returned');
$this->assertContains('http://example.org/subj4', $subjects, 'subj4 matches and should be returned');
}
