fpm: Add "stdin" functionality to test helper

Author: maaarghk

sapi/fpm/tests/tester.inc

@@ -534,7 +534,8 @@ class Tester
         string $query = '',
         array $headers = [],
         string $uri = null,
-        string $scriptFilename = null
+        string $scriptFilename = null,
+        ?string $stdin = null
     ) {
         if (is_null($uri)) {
             $uri = $this->makeSourceFile();
@@ -543,7 +544,7 @@ class Tester
         $params = array_merge(
             [
                 'GATEWAY_INTERFACE' => 'FastCGI/1.0',
-                'REQUEST_METHOD'    => 'GET',
+                'REQUEST_METHOD'    => is_null($stdin) ? 'GET' : 'POST',
                 'SCRIPT_FILENAME'   => $scriptFilename ?: $uri,
                 'SCRIPT_NAME'       => $uri,
                 'QUERY_STRING'      => $query,
@@ -558,7 +559,7 @@ class Tester
                 'SERVER_PROTOCOL'   => 'HTTP/1.1',
                 'DOCUMENT_ROOT'     => __DIR__,
                 'CONTENT_TYPE'      => '',
-                'CONTENT_LENGTH'    => 0
+                'CONTENT_LENGTH'    => strlen($stdin ?? "") // Default to 0
             ],
             $headers
         );
@@ -589,17 +590,18 @@ class Tester
         string $successMessage = null,
         string $errorMessage = null,
         bool $connKeepAlive = false,
-        string $scriptFilename = null
+        string $scriptFilename = null,
+        string $stdin = null
     ) {
         if ($this->hasError()) {
             return new Response(null, true);
         }
 
-        $params = $this->getRequestParams($query, $headers, $uri, $scriptFilename);
+        $params = $this->getRequestParams($query, $headers, $uri, $scriptFilename, $stdin);
 
         try {
             $this->response = new Response(
-                $this->getClient($address, $connKeepAlive)->request_data($params, false)
+                $this->getClient($address, $connKeepAlive)->request_data($params, $stdin)
             );
             $this->message($successMessage);
         } catch (\Exception $exception) {