Add FPM test for php_admin_value doc_root usage

Closes GH-7673.

Author: bukka

sapi/fpm/tests/php-admin-doc-root.phpt

@@ -0,0 +1,46 @@
+--TEST--
+FPM: php_admin_value doc_root usage
+--SKIPIF--
+<?php include "skipif.inc"; ?>
+--FILE--
+<?php
+
+require_once "tester.inc";
+
+$docRoot = __DIR__ . '/';
+
+$cfg = <<<EOT
+[global]
+error_log = {{FILE:LOG}}
+[unconfined]
+listen = {{ADDR}}
+pm = dynamic
+pm.max_children = 5
+pm.start_servers = 1
+pm.min_spare_servers = 1
+pm.max_spare_servers = 3
+php_admin_value[doc_root] = $docRoot
+EOT;
+
+$code = <<<EOT
+<?php
+echo "OK";
+EOT;
+
+$tester = new FPM\Tester($cfg, $code);
+$sourceFile = $tester->makeSourceFile();
+$tester->start();
+$tester->expectLogStartNotices();
+$tester->request(uri: basename($sourceFile), scriptFilename: $sourceFile)->expectBody('OK');
+$tester->terminate();
+$tester->close();
+
+?>
+Done
+--EXPECT--
+Done
+--CLEAN--
+<?php
+require_once "tester.inc";
+FPM\Tester::clean();
+?>

sapi/fpm/tests/tester.inc

@@ -527,16 +527,14 @@ class Tester
      * @param string $query
      * @param array $headers
      * @param string|null $uri
-     * @param string|null $address
-     * @param string|null $successMessage
-     * @param string|null $errorMessage
-     * @param bool $connKeepAlive
+     * @param string|null $scriptFilename
      * @return array
      */
     private function getRequestParams(
         string $query = '',
         array $headers = [],
-        string $uri = null
+        string $uri = null,
+        string $scriptFilename = null
     ) {
         if (is_null($uri)) {
             $uri = $this->makeSourceFile();
@@ -546,7 +544,7 @@ class Tester
             [
                 'GATEWAY_INTERFACE' => 'FastCGI/1.0',
                 'REQUEST_METHOD'    => 'GET',
-                'SCRIPT_FILENAME'   => $uri,
+                'SCRIPT_FILENAME'   => $scriptFilename ?: $uri,
                 'SCRIPT_NAME'       => $uri,
                 'QUERY_STRING'      => $query,
                 'REQUEST_URI'       => $uri . ($query ? '?'.$query : ""),
@@ -580,6 +578,7 @@ class Tester
      * @param string|null $successMessage
      * @param string|null $errorMessage
      * @param bool $connKeepAlive
+     * @param string|null $scriptFilename = null
      * @return Response
      */
     public function request(
@@ -589,13 +588,14 @@ class Tester
         string $address = null,
         string $successMessage = null,
         string $errorMessage = null,
-        bool $connKeepAlive = false
+        bool $connKeepAlive = false,
+        string $scriptFilename = null
     ) {
         if ($this->hasError()) {
             return new Response(null, true);
         }
 
-        $params = $this->getRequestParams($query, $headers, $uri);
+        $params = $this->getRequestParams($query, $headers, $uri, $scriptFilename);
 
         try {
             $this->response = new Response(