Tests: Extract trait for building requests

tests/integration/BuildsHttpRequests.php

@@ -0,0 +1,48 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
+namespace Flarum\Tests\integration;
+
+use Dflydev\FigCookies\SetCookie;
+use Laminas\Diactoros\CallbackStream;
+use Psr\Http\Message\ResponseInterface as Response;
+use Psr\Http\Message\ServerRequestInterface as Request;
+
+/**
+ * A collection of helpers for building PSR-7 requests for integration tests.
+ */
+trait BuildsHttpRequests
+{
+    protected function requestWithJsonBody(Request $req, array $json): Request
+    {
+        return $req
+            ->withHeader('Content-Type', 'application/json')
+            ->withBody(
+                new CallbackStream(function () use ($json) {
+                    return json_encode($json);
+                })
+            );
+    }
+
+    protected function requestWithCookiesFrom(Request $req, Response $previous): Request
+    {
+        $cookies = array_reduce(
+            $previous->getHeader('Set-Cookie'),
+            function ($memo, $setCookieString) {
+                $setCookie = SetCookie::fromSetCookieString($setCookieString);
+                $memo[$setCookie->getName()] = $setCookie->getValue();
+
+                return $memo;
+            },
+            []
+        );
+
+        return $req->withCookieParams($cookies);
+    }
+}