Add tests with 100% coverage for Algorithm\Degree

Author: clue

tests/DegreeTest.php

@@ -56,8 +56,11 @@ public function testGraphIrregular()
     {
         // 1 -> 2 -> 3
         $graph = new Graph();
-        $graph->createVertex(1)->createEdgeTo($graph->createVertex(2));
-        $graph->getVertex(2)->createEdgeTo($graph->createVertex(3));
+        $v1 = $graph->createVertex(1);
+        $v2 = $graph->createVertex(2);
+        $v3 = $graph->createVertex(3);
+        $v1->createEdgeTo($v2);
+        $v2->createEdgeTo($v3);
 
         $alg = new AlgorithmDegree($graph);
 
@@ -71,5 +74,27 @@ public function testGraphIrregular()
         $this->assertEquals(2, $alg->getDegreeMax());
         $this->assertFalse($alg->isRegular());
         $this->assertFalse($alg->isBalanced());
+
+
+        $this->assertEquals(0, $alg->getDegreeInVertex($v1));
+        $this->assertEquals(1, $alg->getDegreeOutVertex($v1));
+        $this->assertEquals(1, $alg->getDegreeVertex($v1));
+        $this->assertFalse($alg->isVertexIsolated($v1));
+        $this->assertFalse($alg->isVertexSink($v1));
+        $this->assertTrue($alg->isVertexSource($v1));
+
+        $this->assertEquals(1, $alg->getDegreeInVertex($v2));
+        $this->assertEquals(1, $alg->getDegreeOutVertex($v2));
+        $this->assertEquals(2, $alg->getDegreeVertex($v2));
+        $this->assertFalse($alg->isVertexIsolated($v2));
+        $this->assertFalse($alg->isVertexSink($v2));
+        $this->assertFalse($alg->isVertexSource($v2));
+
+        $this->assertEquals(1, $alg->getDegreeInVertex($v3));
+        $this->assertEquals(0, $alg->getDegreeOutVertex($v3));
+        $this->assertEquals(1, $alg->getDegreeVertex($v3));
+        $this->assertFalse($alg->isVertexIsolated($v3));
+        $this->assertTrue($alg->isVertexSink($v3));
+        $this->assertFalse($alg->isVertexSource($v3));
     }
 }