function test_remove_triples_about_affects_only_specified_subject()
{
$g = new SimpleGraph();
$g->add_resource_triple('http://example.org/subj', 'http://example.org/pred', 'http://example.org/obj');
$g->add_literal_triple('http://example.org/subj2', 'http://example.org/pred', 'literal');
$g->remove_triples_about('http://example.org/subj');
$this->assertEquals(1, count($g->get_triples()));
}
