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AbstractDirectedGraphTestCase.php
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Thu, May 23, 13:30

AbstractDirectedGraphTestCase.php
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<?php
/**
* @group testcase
*/
final class AbstractDirectedGraphTestCase extends PhutilTestCase {
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.');
}
public function testTopographicSortTree() {
$graph = array(
'A' => array('B', 'C'),
'B' => array('D', 'E'),
'C' => array(),
'D' => array(),
'E' => array()
);
$sorted = $this->getTopographicSort($graph);
$this->assertEqual(
array('A', 'C', 'B', 'E', 'D'),
$sorted,
'Topographically sorted tree.');
$graph = array(
'A' => array('B', 'C'),
'B' => array('C'),
'C' => array('D', 'E'),
'D' => array('E'),
'E' => array()
);
$sorted = $this->getTopographicSort($graph);
$this->assertEqual(
array('A', 'B', 'C', 'D', 'E'),
$sorted,
'Topographically sorted tree with nesting.');
}
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);
}
private function getTopographicSort(array $graph, $seed = 'A') {
$detector = new TestAbstractDirectedGraph();
$detector->setTestData($graph);
$detector->addNodes(array_select_keys($graph, array($seed)));
$detector->loadGraph();
return $detector->getTopographicallySortedNodes();
}
}

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