[11.x] Backport TestResponse::assertRedirectBack (#55780)

* Backport `TestResponse::assertRedirectBack`

* Backport tests too

Author: GrahamCampbell

src/Illuminate/Testing/TestResponse.php

@@ -214,6 +214,23 @@ public function assertRedirectContains($uri)
         return $this;
     }
 
+    /**
+     * Assert whether the response is redirecting back to the previous location.
+     *
+     * @return $this
+     */
+    public function assertRedirectBack()
+    {
+        PHPUnit::withResponse($this)->assertTrue(
+            $this->isRedirect(),
+            $this->statusMessageWithDetails('201, 301, 302, 303, 307, 308', $this->getStatusCode()),
+        );
+
+        $this->assertLocation(app('url')->previous());
+
+        return $this;
+    }
+
     /**
      * Assert whether the response is redirecting to a given route.
      *

tests/Testing/TestResponseTest.php

@@ -2631,6 +2631,27 @@ public function testAssertRedirect()
         $response->assertRedirect();
     }
 
+    public function testAssertRedirectBack()
+    {
+        app()->instance('session.store', $store = new Store('test-session', new ArraySessionHandler(1)));
+
+        $store->setPreviousUrl('https://url.com');
+
+        app('url')->setSessionResolver(fn () => app('session.store'));
+
+        $response = TestResponse::fromBaseResponse(
+            (new Response('', 302))->withHeaders(['Location' => 'https://url.com'])
+        );
+
+        $response->assertRedirectBack();
+
+        $this->expectException(ExpectationFailedException::class);
+
+        $store->setPreviousUrl('https://url.net');
+
+        $response->assertRedirectBack();
+    }
+
     public function testGetDecryptedCookie()
     {
         $response = TestResponse::fromBaseResponse(