Add tests with 100% coverage for Algorithm\Flow

Author: clue

tests/FlowTest.php

@@ -0,0 +1,62 @@
+<?php
+
+use Fhaculty\Graph\Algorithm\Flow as AlgorithmFlow;
+use Fhaculty\Graph\Graph;
+
+class FlowaTest extends TestCase
+{
+    public function testGraphEmpty()
+    {
+        $graph = new Graph();
+
+        $alg = new AlgorithmFlow($graph);
+
+        $this->assertFalse($alg->hasFlow());
+
+        return $graph;
+    }
+
+    public function testEdgeWithZeroFlowIsConsideredFlow()
+    {
+        // 1 -- 2
+        $graph = new Graph();
+        $graph->createVertex(1)->createEdge($graph->createVertex(2))->setFlow(0);
+
+
+        $alg = new AlgorithmFlow($graph);
+
+        $this->assertTrue($alg->hasFlow());
+    }
+
+    /**
+     *
+     * @param Graph $graph
+     * @depends testGraphEmpty
+     */
+    public function testGraphSimple(Graph $graph)
+    {
+        // 1 -> 2
+        $graph->createVertex(1)->createEdgeTo($graph->createVertex(2));
+
+        $alg = new AlgorithmFlow($graph);
+
+        $this->assertFalse($alg->hasFlow());
+
+        return $graph;
+    }
+
+    /**
+     *
+     * @param Graph $graph
+     * @depends testGraphSimple
+     */
+    public function testGraphWithUnweightedEdges(Graph $graph)
+    {
+        // additional flow edge: 2 -> 3
+        $graph->getVertex(2)->createEdgeTo($graph->createVertex(3))->setFlow(10);
+
+        $alg = new AlgorithmFlow($graph);
+
+        $this->assertTrue($alg->hasFlow());
+    }
+}