Add tests with 100% coverage for Algorithm\Bipartit

Author: clue

tests/BipartitTest.php

@@ -0,0 +1,94 @@
+<?php
+
+use Fhaculty\Graph\Algorithm\Bipartit as AlgorithmBipartit;
+use Fhaculty\Graph\Graph;
+
+class BipartitTest extends TestCase
+{
+    public function testGraphEmpty()
+    {
+        $graph = new Graph();
+
+        $alg = new AlgorithmBipartit($graph);
+
+        $this->assertTrue($alg->isBipartit());
+        $this->assertEquals(array(), $alg->getColors());
+        $this->assertEquals(array(0 => array(), 1 => array()), $alg->getColorVertices());
+    }
+
+    public function testGraphPairIsBipartit()
+    {
+        // 1 -> 2
+        $graph = new Graph();
+        $v1 = $graph->createVertex(1);
+        $v2 = $graph->createVertex(2);
+        $v1->createEdgeTo($v2);
+
+        $alg = new AlgorithmBipartit($graph);
+
+        $this->assertTrue($alg->isBipartit());
+        $this->assertEquals(array(1 => 0, 2 => 1), $alg->getColors());
+        $this->assertEquals(array(0 => array(1 => $v1), 1 => array(2 => $v2)), $alg->getColorVertices());
+
+        return $alg;
+    }
+
+    /**
+     *
+     * @param AlgorithmBipartit $alg
+     * @depends testGraphPairIsBipartit
+     */
+    public function testGraphPairBipartitGroups(AlgorithmBipartit $alg)
+    {
+        // graph does not have any groups assigned, so its groups are not bipartit
+        $this->assertFalse($alg->isBipartitGroups());
+
+        // create a cloned graph with groups assigned according to bipartition
+        $graph = $alg->createGraphGroups();
+
+        $this->assertInstanceOf('Fhaculty\Graph\Graph', $graph);
+
+        $alg2 = new AlgorithmBipartit($graph);
+        $this->assertTrue($alg2->isBipartitGroups());
+    }
+
+    public function testGraphTriangleCycleIsNotBipartit()
+    {
+        // 1 -> 2 --> 3 --> 1
+        $graph = new Graph();
+        $v1 = $graph->createVertex(1);
+        $v2 = $graph->createVertex(2);
+        $v3 = $graph->createVertex(3);
+        $v1->createEdgeTo($v2);
+        $v2->createEdgeTo($v3);
+        $v3->createEdgeTo($v1);
+
+        $alg = new AlgorithmBipartit($graph);
+
+        $this->assertFalse($alg->isBipartit());
+
+        return $alg;
+    }
+
+    /**
+     *
+     * @param AlgorithmBipartit $alg
+     * @expectedException UnexpectedValueException
+     * @depends testGraphTriangleCycleIsNotBipartit
+     */
+    public function testGraphTriangleCycleColorsInvalid(AlgorithmBipartit $alg)
+    {
+        $alg->getColors();
+    }
+
+    /**
+     *
+     * @param AlgorithmBipartit $alg
+     * @expectedException UnexpectedValueException
+     * @depends testGraphTriangleCycleIsNotBipartit
+     */
+    public function testGraphTriangleCycleColorVerticesInvalid(AlgorithmBipartit $alg)
+    {
+        $alg->getColorVertices();
+    }
+}