[10.x] Fix assertRedirectToRoute when route uri is empty (#48023)

* Fix assertRedirectToRoute with empty url in destination route

* Fix typo

Author: khernik93

src/Illuminate/Testing/TestResponse.php

@@ -193,11 +193,7 @@ public function assertRedirectToRoute($name, $parameters = [])
             $this->statusMessageWithDetails('201, 301, 302, 303, 307, 308', $this->getStatusCode()),
         );
 
-        $request = Request::create($this->headers->get('Location'));
-
-        PHPUnit::assertEquals(
-            app('url')->to($uri), $request->fullUrl()
-        );
+        $this->assertLocation($uri);
 
         return $this;
     }

tests/Testing/AssertRedirectToRouteTest.php

@@ -34,6 +34,10 @@ protected function setUp(): void
             ->get('named-route-with-param/{param}')
             ->name('named-route-with-param');
 
+        $this->router
+            ->get('')
+            ->name('route-with-empty-uri');
+
         $this->urlGenerator = $this->app->make(UrlGenerator::class);
     }
 
@@ -70,6 +74,16 @@ public function testAssertRedirectToRouteWithRouteNameAndParams()
             ]);
     }
 
+    public function testAssertRedirectToRouteWithRouteNameAndParamsWhenRouteUriIsEmpty()
+    {
+        $this->router->get('test-route', function () {
+            return new RedirectResponse($this->urlGenerator->route('route-with-empty-uri', ['foo' => 'bar']));
+        });
+
+        $this->get('test-route')
+            ->assertRedirectToRoute('route-with-empty-uri', ['foo' => 'bar']);
+    }
+
     protected function tearDown(): void
     {
         parent::tearDown();