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AbstractDirectedGraphTestCase.php
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Tue, Nov 5, 17:54

AbstractDirectedGraphTestCase.php
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<?php
/*
* Copyright 2011 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
class AbstractDirectedGraphTestCase extends ArcanistPhutilTestCase {
public function testTrivialGraph() {
$graph = array(
'A' => array(),
);
$cycle = $this->findGraphCycle($graph);
$this->assertEqual(null, $cycle, 'Trivial Graph');
}
public function testNoncyclicGraph() {
$graph = array(
'A' => array('B', 'C'),
'B' => array('D'),
'C' => array(),
'D' => array(),
);
$cycle = $this->findGraphCycle($graph);
$this->assertEqual(null, $cycle, 'Noncyclic Graph');
}
public function testTrivialCyclicGraph() {
$graph = array(
'A' => array('A'),
);
$cycle = $this->findGraphCycle($graph);
$this->assertEqual(array('A', 'A'), $cycle, 'Trivial Cycle');
}
public function testCyclicGraph() {
$graph = array(
'A' => array('B', 'C'),
'B' => array('D'),
'C' => array('E', 'F'),
'D' => array(),
'E' => array(),
'F' => array('G', 'C'),
'G' => array(),
);
$cycle = $this->findGraphCycle($graph);
$this->assertEqual(array('A', 'C', 'F', 'C'), $cycle, 'Cyclic Graph');
}
public function testNonTreeGraph() {
// This graph is non-cyclic, but C is both a child and a grandchild of A.
// This is permitted.
$graph = array(
'A' => array('B', 'C'),
'B' => array('C'),
'C' => array(),
);
$cycle = $this->findGraphCycle($graph);
$this->assertEqual(null, $cycle, 'NonTreeGraph');
}
public function testEdgeLoadFailure() {
$graph = array(
'A' => array('B'),
);
$raised = null;
try {
$this->findGraphCycle($graph);
} catch (Exception $ex) {
$raised = $ex;
}
$this->assertEqual(
true,
(bool)$raised,
'Exception raised by unloadable edges.');
}
private function findGraphCycle(array $graph, $seed = 'A', $search = 'A') {
$detector = new TestAbstractDirectedGraph();
$detector->setTestData($graph);
$detector->addNodes(array_select_keys($graph, array($seed)));
$detector->loadGraph();
return $detector->detectCycles($search);
}
}

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