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addNode($node1); $node2 = new Structures_Graph_Node(); $graph->addNode($node2); $node1->connectTo($node2); $node3 = new Structures_Graph_Node(); $graph->addNode($node3); $node2->connectTo($node3); $node3->connectTo($node1); $this->assertFalse( Structures_Graph_Manipulator_AcyclicTest::isAcyclic($graph), 'Graph is cyclic' ); } public function testIsAcyclicTrue() { $graph = new Structures_Graph(); $node1 = new Structures_Graph_Node(); $graph->addNode($node1); $node2 = new Structures_Graph_Node(); $graph->addNode($node2); $node1->connectTo($node2); $node3 = new Structures_Graph_Node(); $graph->addNode($node3); $node2->connectTo($node3); $this->assertTrue( Structures_Graph_Manipulator_AcyclicTest::isAcyclic($graph), 'Graph is acyclic' ); } } ?>