[8.x] Call on_stats handler in Http stub callbacks

src/Illuminate/Http/Client/Factory.php

@@ -3,7 +3,9 @@
 namespace Illuminate\Http\Client;
 
 use Closure;
+use GuzzleHttp\Promise\PromiseInterface;
 use GuzzleHttp\Psr7\Response as Psr7Response;
+use GuzzleHttp\TransferStats;
 use Illuminate\Contracts\Events\Dispatcher;
 use Illuminate\Support\Str;
 use Illuminate\Support\Traits\Macroable;
@@ -162,11 +164,20 @@ public function fake($callback = null)
         }
 
         $this->stubCallbacks = $this->stubCallbacks->merge(collect([
-            $callback instanceof Closure
-                    ? $callback
-                    : function () use ($callback) {
-                        return $callback;
-                    },
+            function ($request, $options) use ($callback) {
+                $response = $callback instanceof Closure
+                    ? $callback($request, $options)
+                    : $callback;
+
+                if ($response instanceof PromiseInterface) {
+                    $options['on_stats'](new TransferStats(
+                        $request->toPsrRequest(),
+                        $response->wait(),
+                    ));
+                }
+
+                return $response;
+            },
         ]));
 
         return $this;

tests/Http/HttpClientTest.php

@@ -942,7 +942,7 @@ public function testTheRequestSendingAndResponseReceivedEventsAreFiredWhenAReque
 
     public function testTheTransferStatsAreCalledSafelyWhenFakingTheRequest()
     {
-        $this->factory->fake(['https://example.com' => $this->factory->response()]);
+        $this->factory->fake(['https://example.com' => ['world' => 'Hello world']]);
         $stats = $this->factory->get('https://example.com')->handlerStats();
         $effectiveUri = $this->factory->get('https://example.com')->effectiveUri();
 
@@ -952,6 +952,14 @@ public function testTheTransferStatsAreCalledSafelyWhenFakingTheRequest()
         $this->assertNull($effectiveUri);
     }
 
+    public function testTransferStatsArePresentWhenFakingTheRequestUsingAPromiseResponse()
+    {
+        $this->factory->fake(['https://example.com' => $this->factory->response()]);
+        $effectiveUri = $this->factory->get('https://example.com')->effectiveUri();
+
+        $this->assertSame('https://example.com', (string) $effectiveUri);
+    }
+
     public function testClonedClientsWorkSuccessfullyWithTheRequestObject()
     {
         $events = m::mock(Dispatcher::class);