public function testDiscoveryEdges()
{
$graph = new Graph([1, 2, 3], [[1, 2], [1, 3], [2, 3]], true);
$this->assertCount(2, $graph->getVertex(1)->getDiscoveryEdges());
$this->assertCount(1, $graph->getVertex(2)->getDiscoveryEdges());
$this->assertCount(0, $graph->getVertex(3)->getDiscoveryEdges());
$undirected = new Graph([1, 2, 3], [[1, 2], [1, 3], [2, 3]]);
$this->assertCount(2, $undirected->getVertex(1)->getDiscoveryEdges());
$this->assertCount(2, $undirected->getVertex(2)->getDiscoveryEdges());
$this->assertCount(2, $undirected->getVertex(3)->getDiscoveryEdges());
}
public function testSourceSinkVerticesAreCorrect()
{
$graph = new Graph([0, 1, 2, 3, 4], [[0, 1], [1, 2], [2, 3], [3, 4], [1, 3]], true);
$sinkArray = $graph->getSinkVertices();
$sourceArray = $graph->getSourceVertices();
$this->assertCount(1, $sourceArray);
$this->assertCount(1, $sinkArray);
$this->assertTrue(in_array($graph->getVertex(0), $sourceArray));
$this->assertFalse(in_array($graph->getVertex(1), $sourceArray));
$this->assertFalse(in_array($graph->getVertex(1), $sinkArray));
$this->assertFalse(in_array($graph->getVertex(3), $sinkArray));
$this->assertTrue(in_array($graph->getVertex(4), $sinkArray));
}
public function testDFS()
{
$edges = [[1, 2], [1, 3], [2, 5], [3, 3], [3, 4], [4, 2]];
$undirected = new Graph([1, 2, 3, 4, 5], $edges);
$directed = new Graph([1, 2, 3, 4, 5], $edges, true);
$this->assertEquals([$directed->getVertex(1), $directed->getVertex(3), $directed->getVertex(4), $directed->getVertex(2), $directed->getVertex(5)], GraphAlgorithms::dfs($directed, 1));
$this->assertEquals([$undirected->getVertex(1), $undirected->getVertex(3), $undirected->getVertex(4), $undirected->getVertex(2), $undirected->getVertex(5)], GraphAlgorithms::dfs($undirected, 1));
$this->assertEquals([$undirected->getVertex(5), $undirected->getVertex(2), $undirected->getVertex(4), $undirected->getVertex(3), $undirected->getVertex(1)], GraphAlgorithms::dfs($undirected, 5));
$this->assertEquals([$directed->getVertex(5)], GraphAlgorithms::dfs($directed, 5));
$graph = new Graph([1, 2], [[1, 2]], true);
$visited = [];
GraphAlgorithms::dfs($graph, 2, function ($v) use(&$visited) {
$visited[] = $v->label;
return true;
});
$this->assertEquals([2], $visited);
}
public function addOutEdgeToId($vertexId, $weight = 1)
{
$this->addOutEdgeTo($this->graph->getVertex($vertexId), $weight);
}
