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<?php declare(strict_types=1);
/*
* This file is part of PHPUnit.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace PHPUnit\Runner;
use function array_diff;
use function array_merge;
use function array_reverse;
use function array_splice;
use function count;
use function in_array;
use function max;
use function shuffle;
use function usort;
use PHPUnit\Framework\DataProviderTestSuite;
use PHPUnit\Framework\Reorderable;
use PHPUnit\Framework\Test;
use PHPUnit\Framework\TestCase;
use PHPUnit\Framework\TestSuite;
use PHPUnit\Runner\ResultCache\NullResultCache;
use PHPUnit\Runner\ResultCache\ResultCache;
/**
* @no-named-arguments Parameter names are not covered by the backward compatibility promise for PHPUnit
*
* @internal This class is not covered by the backward compatibility promise for PHPUnit
*/
final class TestSuiteSorter
{
/**
* @var int
*/
public const ORDER_DEFAULT = 0;
/**
* @var int
*/
public const ORDER_RANDOMIZED = 1;
/**
* @var int
*/
public const ORDER_REVERSED = 2;
/**
* @var int
*/
public const ORDER_DEFECTS_FIRST = 3;
/**
* @var int
*/
public const ORDER_DURATION = 4;
/**
* @var int
*/
public const ORDER_SIZE = 5;
private const SIZE_SORT_WEIGHT = [
'small' => 1,
'medium' => 2,
'large' => 3,
'unknown' => 4,
];
/**
* @psalm-var array<string, int> Associative array of (string => DEFECT_SORT_WEIGHT) elements
*/
private array $defectSortOrder = [];
private readonly ResultCache $cache;
/**
* @psalm-var array<string> A list of normalized names of tests before reordering
*/
private array $originalExecutionOrder = [];
/**
* @psalm-var array<string> A list of normalized names of tests affected by reordering
*/
private array $executionOrder = [];
public function __construct(?ResultCache $cache = null)
{
$this->cache = $cache ?? new NullResultCache;
}
/**
* @throws Exception
*/
public function reorderTestsInSuite(Test $suite, int $order, bool $resolveDependencies, int $orderDefects, bool $isRootTestSuite = true): void
{
$allowedOrders = [
self::ORDER_DEFAULT,
self::ORDER_REVERSED,
self::ORDER_RANDOMIZED,
self::ORDER_DURATION,
self::ORDER_SIZE,
];
if (!in_array($order, $allowedOrders, true)) {
throw new InvalidOrderException;
}
$allowedOrderDefects = [
self::ORDER_DEFAULT,
self::ORDER_DEFECTS_FIRST,
];
if (!in_array($orderDefects, $allowedOrderDefects, true)) {
throw new InvalidOrderException;
}
if ($isRootTestSuite) {
$this->originalExecutionOrder = $this->calculateTestExecutionOrder($suite);
}
if ($suite instanceof TestSuite) {
foreach ($suite as $_suite) {
$this->reorderTestsInSuite($_suite, $order, $resolveDependencies, $orderDefects, false);
}
if ($orderDefects === self::ORDER_DEFECTS_FIRST) {
$this->addSuiteToDefectSortOrder($suite);
}
$this->sort($suite, $order, $resolveDependencies, $orderDefects);
}
if ($isRootTestSuite) {
$this->executionOrder = $this->calculateTestExecutionOrder($suite);
}
}
public function getOriginalExecutionOrder(): array
{
return $this->originalExecutionOrder;
}
public function getExecutionOrder(): array
{
return $this->executionOrder;
}
private function sort(TestSuite $suite, int $order, bool $resolveDependencies, int $orderDefects): void
{
if (empty($suite->tests())) {
return;
}
if ($order === self::ORDER_REVERSED) {
$suite->setTests($this->reverse($suite->tests()));
} elseif ($order === self::ORDER_RANDOMIZED) {
$suite->setTests($this->randomize($suite->tests()));
} elseif ($order === self::ORDER_DURATION) {
$suite->setTests($this->sortByDuration($suite->tests()));
} elseif ($order === self::ORDER_SIZE) {
$suite->setTests($this->sortBySize($suite->tests()));
}
if ($orderDefects === self::ORDER_DEFECTS_FIRST) {
$suite->setTests($this->sortDefectsFirst($suite->tests()));
}
if ($resolveDependencies && !($suite instanceof DataProviderTestSuite)) {
$tests = $suite->tests();
$suite->setTests($this->resolveDependencies($tests));
}
}
private function addSuiteToDefectSortOrder(TestSuite $suite): void
{
$max = 0;
foreach ($suite->tests() as $test) {
if (!$test instanceof Reorderable) {
continue;
}
if (!isset($this->defectSortOrder[$test->sortId()])) {
$this->defectSortOrder[$test->sortId()] = $this->cache->status($test->sortId())->asInt();
$max = max($max, $this->defectSortOrder[$test->sortId()]);
}
}
$this->defectSortOrder[$suite->sortId()] = $max;
}
private function reverse(array $tests): array
{
return array_reverse($tests);
}
private function randomize(array $tests): array
{
shuffle($tests);
return $tests;
}
private function sortDefectsFirst(array $tests): array
{
usort(
$tests,
fn ($left, $right) => $this->cmpDefectPriorityAndTime($left, $right),
);
return $tests;
}
private function sortByDuration(array $tests): array
{
usort(
$tests,
fn ($left, $right) => $this->cmpDuration($left, $right),
);
return $tests;
}
private function sortBySize(array $tests): array
{
usort(
$tests,
fn ($left, $right) => $this->cmpSize($left, $right),
);
return $tests;
}
/**
* Comparator callback function to sort tests for "reach failure as fast as possible".
*
* 1. sort tests by defect weight defined in self::DEFECT_SORT_WEIGHT
* 2. when tests are equally defective, sort the fastest to the front
* 3. do not reorder successful tests
*/
private function cmpDefectPriorityAndTime(Test $a, Test $b): int
{
if (!($a instanceof Reorderable && $b instanceof Reorderable)) {
return 0;
}
$priorityA = $this->defectSortOrder[$a->sortId()] ?? 0;
$priorityB = $this->defectSortOrder[$b->sortId()] ?? 0;
if ($priorityB <=> $priorityA) {
// Sort defect weight descending
return $priorityB <=> $priorityA;
}
if ($priorityA || $priorityB) {
return $this->cmpDuration($a, $b);
}
// do not change execution order
return 0;
}
/**
* Compares test duration for sorting tests by duration ascending.
*/
private function cmpDuration(Test $a, Test $b): int
{
if (!($a instanceof Reorderable && $b instanceof Reorderable)) {
return 0;
}
return $this->cache->time($a->sortId()) <=> $this->cache->time($b->sortId());
}
/**
* Compares test size for sorting tests small->medium->large->unknown.
*/
private function cmpSize(Test $a, Test $b): int
{
$sizeA = ($a instanceof TestCase || $a instanceof DataProviderTestSuite)
? $a->size()->asString()
: 'unknown';
$sizeB = ($b instanceof TestCase || $b instanceof DataProviderTestSuite)
? $b->size()->asString()
: 'unknown';
return self::SIZE_SORT_WEIGHT[$sizeA] <=> self::SIZE_SORT_WEIGHT[$sizeB];
}
/**
* Reorder Tests within a TestCase in such a way as to resolve as many dependencies as possible.
* The algorithm will leave the tests in original running order when it can.
* For more details see the documentation for test dependencies.
*
* Short description of algorithm:
* 1. Pick the next Test from remaining tests to be checked for dependencies.
* 2. If the test has no dependencies: mark done, start again from the top
* 3. If the test has dependencies but none left to do: mark done, start again from the top
* 4. When we reach the end add any leftover tests to the end. These will be marked 'skipped' during execution.
*
* @psalm-param array<DataProviderTestSuite|TestCase> $tests
*
* @psalm-return array<DataProviderTestSuite|TestCase>
*/
private function resolveDependencies(array $tests): array
{
$newTestOrder = [];
$i = 0;
$provided = [];
do {
if ([] === array_diff($tests[$i]->requires(), $provided)) {
$provided = array_merge($provided, $tests[$i]->provides());
$newTestOrder = array_merge($newTestOrder, array_splice($tests, $i, 1));
$i = 0;
} else {
$i++;
}
} while (!empty($tests) && ($i < count($tests)));
return array_merge($newTestOrder, $tests);
}
private function calculateTestExecutionOrder(Test $suite): array
{
$tests = [];
if ($suite instanceof TestSuite) {
foreach ($suite->tests() as $test) {
if (!$test instanceof TestSuite && $test instanceof Reorderable) {
$tests[] = $test->sortId();
} else {
$tests = array_merge($tests, $this->calculateTestExecutionOrder($test));
}
}
}
return $tests;
}
}