fix with cookies

src/Illuminate/Http/Client/PendingRequest.php

@@ -3,6 +3,7 @@
 namespace Illuminate\Http\Client;
 
 use GuzzleHttp\Client;
+use GuzzleHttp\Cookie\CookieJar;
 use GuzzleHttp\Exception\ConnectException;
 use GuzzleHttp\HandlerStack;
 use Illuminate\Support\Traits\Macroable;
@@ -285,13 +286,14 @@ public function withToken($token, $type = 'Bearer')
      * Specify the cookies that should be included with the request.
      *
      * @param  array  $cookies
+     * @param  string  $domain
      * @return $this
      */
-    public function withCookies(array $cookies)
+    public function withCookies(array $cookies, string $domain)
     {
-        return tap($this, function ($request) use ($cookies) {
+        return tap($this, function ($request) use ($cookies, $domain) {
             return $this->options = array_merge_recursive($this->options, [
-                'cookies' => $cookies,
+                'cookies' => CookieJar::fromArray($cookies, $domain),
             ]);
         });
     }

tests/Http/HttpClientTest.php

@@ -193,4 +193,22 @@ public function testFakeSequence()
         $this->assertSame(201, $this->factory->get('https://example.com')->status());
         $this->assertSame(301, $this->factory->get('https://example.com')->status());
     }
+
+    public function testWithCookies()
+    {
+        $this->factory->fakeSequence()->pushStatus(200);
+
+        $response = $this->factory->withCookies(
+            ['foo' => 'bar'], 'https://laravel.com'
+        )->get('https://laravel.com');
+
+        $this->assertCount(1, $response->cookies()->toArray());
+
+        /** @var CookieJarInterface $responseCookies */
+        $responseCookie = $response->cookies()->toArray()[0];
+
+        $this->assertSame('foo', $responseCookie['Name']);
+        $this->assertSame('bar', $responseCookie['Value']);
+        $this->assertSame('https://laravel.com', $responseCookie['Domain']);
+    }
 }