[Process] Pass the commandline as array to proc_open()

Author: ausi

Tests/HttpClientTestCase.php

@@ -327,7 +327,12 @@ private static function startVulcain(HttpClientInterface $client)
             'KEY_FILE' => __DIR__.'/Fixtures/tls/server.key',
             'CERT_FILE' => __DIR__.'/Fixtures/tls/server.crt',
         ]);
-        $process->start();
+
+        try {
+            $process->start();
+        } catch (ProcessFailedException $e) {
+            self::markTestSkipped('vulcain failed: '.$e->getMessage());
+        }
 
         register_shutdown_function($process->stop(...));
         sleep('\\' === \DIRECTORY_SEPARATOR ? 10 : 1);