Add tests with 100% coverage for Algorithm\Eulerian

Author: clue

tests/Fhaculty/Graph/Algorithm/EulerianTest.php

@@ -0,0 +1,45 @@
+<?php
+
+use Fhaculty\Graph\Algorithm\Eulerian as AlgorithmEulerian;
+use Fhaculty\Graph\Graph;
+
+class EulerianTest extends TestCase
+{
+    public function testGraphEmpty()
+    {
+        $graph = new Graph();
+
+        $alg = new AlgorithmEulerian($graph);
+
+        $this->assertFalse($alg->hasCycle());
+    }
+
+    public function testGraphPairHasNoCycle()
+    {
+        // 1 -- 2
+        $graph = new Graph();
+        $v1 = $graph->createVertex(1);
+        $v2 = $graph->createVertex(2);
+        $v1->createEdge($v2);
+
+        $alg = new AlgorithmEulerian($graph);
+
+        $this->assertFalse($alg->hasCycle());
+    }
+
+    public function testGraphTriangleCycleIsNotBipartit()
+    {
+        // 1 -- 2 -- 3 -- 1
+        $graph = new Graph();
+        $v1 = $graph->createVertex(1);
+        $v2 = $graph->createVertex(2);
+        $v3 = $graph->createVertex(3);
+        $v1->createEdge($v2);
+        $v2->createEdge($v3);
+        $v3->createEdge($v1);
+
+        $alg = new AlgorithmEulerian($graph);
+
+        $this->assertTrue($alg->hasCycle());
+    }
+}