upgrade

vendor/graphp/algorithms/tests/MinimumSpanningTree/KruskalTest.php

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+<?php
+
+use Fhaculty\Graph\Graph;
+use Fhaculty\Graph\Vertex;
+use Graphp\Algorithms\MinimumSpanningTree\Kruskal;
+
+class KruskalTest extends BaseMstTest
+{
+    protected function createAlg(Vertex $vertex)
+    {
+        return new Kruskal($vertex->getGraph());
+    }
+
+    /**
+     * @expectedException UnexpectedValueException
+     */
+    public function testNullGraphIsNotConsideredToBeConnected()
+    {
+        $graph = new Graph();
+
+        $alg = new Kruskal($graph);
+        $alg->getEdges();
+    }
+}