public function testEdgeStartVertex() { $this->assertTrue($this->edge->hasVertexStart($this->v1)); $this->assertTrue($this->edge->hasVertexTarget($this->v2)); $v3 = $this->graph->createVertex(3); $this->assertFalse($this->edge->hasVertexStart($v3)); $this->assertFalse($this->edge->hasVertexTarget($v3)); }