Add test with 100% coverage for new Algorithm\Directed

Author: clue

tests/DirectedTest.php

@@ -0,0 +1,50 @@
+<?php
+
+use Fhaculty\Graph\Algorithm\Directed as AlgorithmDirected;
+use Fhaculty\Graph\Graph;
+
+class DirectedTest extends TestCase
+{
+    public function testGraphEmpty()
+    {
+        $graph = new Graph();
+
+        $alg = new AlgorithmDirected($graph);
+
+        $this->assertFalse($alg->isDirected());
+    }
+
+    public function testGraphUndirected()
+    {
+        // 1 -- 2
+        $graph = new Graph();
+        $graph->createVertex(1)->createEdge($graph->createVertex(2));
+
+        $alg = new AlgorithmDirected($graph);
+
+        $this->assertFalse($alg->isDirected());
+    }
+
+    public function testGraphDirected()
+    {
+        // 1 -> 2
+        $graph = new Graph();
+        $graph->createVertex(1)->createEdgeTo($graph->createVertex(2));
+
+        $alg = new AlgorithmDirected($graph);
+
+        $this->assertTrue($alg->isDirected());
+    }
+
+    public function testGraphMixed()
+    {
+        // 1 -- 2 -> 3
+        $graph = new Graph();
+        $graph->createVertex(1)->createEdge($graph->createVertex(2));
+        $graph->getVertex(2)->createEdgeTo($graph->createVertex(3));
+
+        $alg = new AlgorithmDirected($graph);
+
+        $this->assertTrue($alg->isDirected());
+    }
+}