Fhaculty\Graph\Tests\WalkTest::testLoopCycle PHP Method

    public function testLoopCycle()
    {
        // 1 --\
        // ^   |
        // \---/
        $graph = new Graph();
        $v1 = $graph->createVertex(1);
        $e1 = $v1->createEdgeTo($v1);
        $cycle = Walk::factoryCycleFromEdges(array($e1), $v1);
        $this->assertGraphEquals($graph, $cycle->createGraph());
        $cycle = Walk::factoryCycleFromPredecessorMap(array(1 => $v1), $v1);
        $this->assertGraphEquals($graph, $cycle->createGraph());
        $cycle = Walk::factoryCycleFromVertices(array($v1, $v1));
        $this->assertGraphEquals($graph, $cycle->createGraph());
        $this->assertCount(2, $cycle->getVertices());
        $this->assertCount(1, $cycle->getEdges());
        $this->assertSame($v1, $cycle->getVertices()->getVertexFirst());
        $this->assertSame($v1, $cycle->getVertices()->getVertexLast());
        $this->assertTrue($cycle->isValid());
        return $v1;
    }