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<?php
declare(strict_types=1);
namespace LaminasTest\Stdlib;
use Laminas\Stdlib\PriorityQueue;
use PHPUnit\Framework\Attributes\Group;
use PHPUnit\Framework\TestCase;
use stdClass;
use function array_values;
use function count;
use function iterator_to_array;
use function serialize;
use function unserialize;
use function var_export;
#[Group('Laminas_Stdlib')]
final class PriorityQueueTest extends TestCase
{
/** @var PriorityQueue<string, int> */
private PriorityQueue $queue;
protected function setUp(): void
{
/** @psalm-var PriorityQueue<string, int> $this->queue */
$this->queue = new PriorityQueue();
$this->queue->insert('foo', 3);
$this->queue->insert('bar', 4);
$this->queue->insert('baz', 2);
$this->queue->insert('bat', 1);
}
public function testSerializationAndDeserializationShouldMaintainState(): void
{
$s = serialize($this->queue);
$unserialized = unserialize($s);
self::assertInstanceOf(PriorityQueue::class, $unserialized);
$count = count($this->queue);
self::assertSame(
$count,
count($unserialized),
'Expected count ' . (string) $count . '; received ' . (string) count($unserialized)
);
$expected = iterator_to_array($this->queue);
$test = iterator_to_array($unserialized);
self::assertSame(
$expected,
$test,
'Expected: ' . var_export($expected, true) . "\nReceived:" . var_export($test, true)
);
}
public function testRetrievingQueueAsArrayReturnsDataOnlyByDefault(): void
{
$expected = [
'foo',
'bar',
'baz',
'bat',
];
$test = $this->queue->toArray();
self::assertSame($expected, $test, var_export($test, true));
}
public function testCanCastToArrayOfPrioritiesOnly(): void
{
$expected = [
3,
4,
2,
1,
];
$test = $this->queue->toArray(PriorityQueue::EXTR_PRIORITY);
self::assertSame($expected, $test, var_export($test, true));
}
public function testCanCastToArrayOfDataPriorityPairs(): void
{
$expected = [
['data' => 'foo', 'priority' => 3],
['data' => 'bar', 'priority' => 4],
['data' => 'baz', 'priority' => 2],
['data' => 'bat', 'priority' => 1],
];
$test = $this->queue->toArray(PriorityQueue::EXTR_BOTH);
self::assertSame($expected, $test, var_export($test, true));
}
public function testCanIterateMultipleTimesAndReceiveSameResults(): void
{
$expected = ['bar', 'foo', 'baz', 'bat'];
for ($i = 1; $i < 3; $i++) {
$test = [];
foreach ($this->queue as $item) {
$test[] = $item;
}
self::assertEquals($expected, $test, 'Failed at iteration ' . (string) $i);
}
}
public function testCanRemoveItemFromQueue(): void
{
$this->queue->remove('baz');
$expected = ['bar', 'foo', 'bat'];
$test = array_values(iterator_to_array($this->queue));
self::assertEquals($expected, $test);
}
public function testCanTestForExistenceOfItemInQueue(): void
{
self::assertTrue($this->queue->contains('foo'));
self::assertFalse($this->queue->contains('foobar'));
}
public function testCanTestForExistenceOfPriorityInQueue(): void
{
self::assertTrue($this->queue->hasPriority(3));
self::assertFalse($this->queue->hasPriority(1000));
}
public function testCloningAlsoClonesQueue(): void
{
$foo = new stdClass();
$foo->name = 'bar';
$queue = new PriorityQueue();
$queue->insert($foo, 1);
$queue->insert($foo, 2);
$queueClone = clone $queue;
while (! $queue->isEmpty()) {
self::assertSame($foo, $queue->top());
$queue->remove($queue->top());
}
self::assertTrue($queue->isEmpty());
self::assertFalse($queueClone->isEmpty());
self::assertEquals(2, $queueClone->count());
while (! $queueClone->isEmpty()) {
self::assertSame($foo, $queueClone->top());
$queueClone->remove($queueClone->top());
}
self::assertTrue($queueClone->isEmpty());
}
public function testQueueRevertsToInitialStateWhenEmpty(): void
{
$queue = new PriorityQueue();
$testQueue = clone $queue; // store the default state
$testQueue->insert('foo', 1);
$testQueue->insert('bar', 2);
$testQueue->remove('foo');
$testQueue->remove('bar');
self::assertEquals($queue, $testQueue);
}
/**
* @see https://github.com/laminas/laminas-stdlib/issues/12
*/
public function testUpdatesCountAfterExtractingTopElement(): void
{
$queue = new PriorityQueue();
$queue->insert('first');
$queue->insert('second');
$queue->extract();
$this->assertCount(1, $queue);
}
/**
* @see https://github.com/laminas/laminas-stdlib/issues/12
*/
public function testTopValueNotFoundAfterExtractingTopElement(): void
{
$queue = new PriorityQueue();
$queue->insert('first');
$queue->insert('second');
$queue->extract();
$this->assertFalse($queue->contains('first'));
}
/**
* @see https://github.com/laminas/laminas-stdlib/issues/12
*/
public function testValueStillFoundAfterExtractingTopElementWhenItIsADuplicate(): void
{
$queue = new PriorityQueue();
$queue->insert('first');
$queue->insert('second');
$queue->insert('first');
$queue->extract();
$this->assertCount(2, $queue);
$this->assertTrue($queue->contains('first'));
}
}
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