assertTrue($alg->isNull()); $this->assertTrue($alg->isEdgeless()); $this->assertFalse($alg->isTrivial()); } public function testSingleVertexIsTrivial() { $graph = new Graph(); $graph->createVertex(1); $alg = new GraphProperty($graph); $this->assertFalse($alg->isNull()); $this->assertTrue($alg->isEdgeless()); $this->assertTrue($alg->isTrivial()); } }