public function testReplaceLiteralTripleReturnsFalseIfNoReplacementMade() { $graph = new ExtendedGraph(); $graph->add_literal_triple('http://some/subject/s1', 'http://some/predicate', 'some object'); $this->assertFalse($graph->replace_literal_triple('http://some/othersubject/s1', 'http://some/predicate', 'some object', 'replacement object'), 'Should return FALSE'); }