fix test on windows

Author: A909M

tests/Pest.php

@@ -95,9 +95,13 @@ function runWithStdin($stdinContent, $arguments)
     $tempFile = tempnam(sys_get_temp_dir(), 'pint_test_stdin_');
     file_put_contents($tempFile, $stdinContent);
 
-    $pintExecutable = file_exists('./pint') ? './pint' : 'vendor/bin/pint';
+    $isWindows = DIRECTORY_SEPARATOR === '\\';
 
-    $command = [$pintExecutable];
+    if ($isWindows) {
+        $command = [PHP_BINARY, 'pint'];
+    } else {
+        $command = ['./pint'];
+    }
 
     if (isset($arguments['path'])) {
         $paths = is_array($arguments['path']) ? $arguments['path'] : [$arguments['path']];