Bugfix. The TestCase is now aware of if it is running in parallel or not 😎

bin/pest

@@ -35,12 +35,21 @@ use Symfony\Component\Console\Output\OutputInterface;
     $argv = new ArgvInput();
 
     $testSuite = TestSuite::getInstance($rootPath, $argv->getParameterOption('--test-directory', 'tests'));
+
     $shouldExecuteInParallel = $argv->hasParameterOption('--parallel');
     // Let's remove the parallel option now we've retrieved its value
     if (($parallelKey = array_search('--parallel', $_SERVER['argv'])) !== false) {
         unset($_SERVER['argv'][$parallelKey]);
     }
 
+    if ($argv->hasParameterOption('--isInParallel')) {
+        $testSuite->isInParallel = true;
+    }
+    // Let's remove the parallel flag now we've retrieved its value
+    if (($parallelKey = array_search('--isInParallel', $_SERVER['argv'])) !== false) {
+        unset($_SERVER['argv'][$parallelKey]);
+    }
+
     $isDecorated = $argv->getParameterOption('--colors', 'always') !== 'never';
     $output = new ConsoleOutput(ConsoleOutput::VERBOSITY_NORMAL, $isDecorated);
 

src/Console/Paratest/PestRunnerWorker.php

@@ -40,10 +40,11 @@ final class PestRunnerWorker
         $args = array_merge(
             $args,
             $this->executableTest->commandArguments(
-                $this->getPestBinary(),
+                $this->getPestBinary($options),
                 $options->filtered(),
                 $options->passthru()
-            )
+            ),
+            ['--isInParallel'],
         );
 
         $this->process = new Process($args, $options->cwd(), $options->fillEnvWithTokens($token));
@@ -109,15 +110,14 @@ final class PestRunnerWorker
         }
     }
 
-    private function getPestBinary(): string
+    private function getPestBinary(Options $options): string
     {
-        // Used when Pest is required using composer.
-        $vendorPath = dirname(__DIR__, 7) . '/bin/pest';
+        $paths = [
+            implode(DIRECTORY_SEPARATOR, [$options->cwd(), 'bin', 'pest']),
+            implode(DIRECTORY_SEPARATOR, [$options->cwd(), 'vendor', 'bin', 'pest']),
+        ];
 
-        // Used when Pest maintainers are running Pest tests.
-        $localPath = dirname(__DIR__, 3) . '/bin/pest';
-
-        return file_exists($vendorPath) ? $vendorPath : $localPath;
+        return file_exists($paths[0]) ? $paths[0] : $paths[1];
     }
 
     public function getWorkerCrashedException(?Throwable $previousException = null): WorkerCrashedException

src/TestSuite.php

@@ -73,6 +73,13 @@ final class TestSuite
      */
     public $testPath;
 
+    /**
+     * Determines if this test is running in parallel.
+     *
+     * @var bool
+     */
+    public $isInParallel = false;
+
     /**
      * Holds an instance of the test suite.
      *

tests/Hooks/BeforeAllTest.php

@@ -1,13 +1,14 @@
 <?php
 
 use Pest\Support\Str;
+use Pest\TestSuite;
 
 global $globalHook;
 
 // HACK: we have to determine our $globalHook->calls baseline. This is because
 // two other tests are executed before this one due to filename ordering.
 $args   = $_SERVER['argv'] ?? [];
-$single = isset($args[1]) && Str::endsWith(__FILE__, $args[1]);
+$single = isset($args[1]) && Str::endsWith(__FILE__, $args[1]) || TestSuite::getInstance()->isInParallel;
 $offset = $single ? 0 : 2;
 
 uses()->beforeAll(function () use ($globalHook, $offset) {