WIP

src/Plugins/Parallel.php

@@ -0,0 +1,74 @@
+<?php
+
+namespace Pest\Plugins;
+
+use ParaTest\ParaTestCommand;
+use Pest\Contracts\Plugins\HandlesArguments;
+use Pest\Plugins\Concerns\HandleArguments;
+use Pest\Support\Arr;
+use Pest\Support\Container;
+use Pest\TestSuite;
+use Symfony\Component\Console\Input\ArgvInput;
+use Symfony\Component\Console\Output\OutputInterface;
+
+final class Parallel implements HandlesArguments
+{
+    use HandleArguments;
+
+    private array $handlers = [
+        \Pest\Plugins\Parallel\Handlers\Parallel::class,
+        \Pest\Plugins\Parallel\Handlers\Laravel::class,
+    ];
+
+    public function handleArguments(array $arguments): array
+    {
+        if ($this->argumentsContainParallelFlags($arguments)) {
+            $exitCode = $this->runTestSuiteInParallel($arguments);
+            exit($exitCode);
+        }
+
+        $this->markTestSuiteAsParallelSubProcessIfRequired();
+
+        return $arguments;
+    }
+
+    private function argumentsContainParallelFlags(array $arguments): bool
+    {
+        return $this->hasArgument('--parallel', $arguments)
+            || $this->hasArgument('-p', $arguments);
+    }
+
+    private function runTestSuiteInParallel(array $arguments): int
+    {
+        if (! class_exists(ParaTestCommand::class)) {
+            $this->askUserToInstallParatest();
+
+            return 1;
+        }
+
+        $filteredArguments = array_reduce(
+            $this->handlers,
+            fn($arguments, $handler) => (new $handler())->handle($arguments),
+            $arguments
+        );
+
+        $testSuite = TestSuite::getInstance();
+
+        return ParaTestCommand::applicationFactory($testSuite->rootPath)->run(new ArgvInput($filteredArguments));
+    }
+
+    private function markTestSuiteAsParallelSubProcessIfRequired(): void
+    {
+        if ((int) Arr::get($_SERVER, 'PARATEST') === 1) {
+            $_SERVER['PEST_PARALLEL'] = 1;
+        }
+    }
+
+    private function askUserToInstallParatest(): void
+    {
+        Container::getInstance()->get(OutputInterface::class)->writeln([
+            '<fg=red>Parallel support requires ParaTest, which is not installed.</>',
+            'Please run <fg=yellow>composer require --dev brianium/paratest</> to install ParaTest.',
+        ]);
+    }
+}