diff --git a/src/Illuminate/Foundation/Testing/TestResponse.php b/src/Illuminate/Foundation/Testing/TestResponse.php
index dbec9ee890ed..2c0d7a08dbd3 100644
--- a/src/Illuminate/Foundation/Testing/TestResponse.php
+++ b/src/Illuminate/Foundation/Testing/TestResponse.php
@@ -9,6 +9,7 @@
 use Illuminate\Contracts\View\View;
 use Illuminate\Support\Traits\Macroable;
 use PHPUnit\Framework\Assert as PHPUnit;
+use Symfony\Component\HttpFoundation\StreamedResponse;
 use Illuminate\Foundation\Testing\Constraints\SeeInOrder;
 
 /**
@@ -27,6 +28,13 @@ class TestResponse
      */
     public $baseResponse;
 
+    /**
+     * The streamed content of the response.
+     *
+     * @var string
+     */
+    protected $streamedContent;
+
     /**
      * Create a new test response instance.
      *
@@ -949,6 +957,28 @@ public function dump()
         dd($content);
     }
 
+    /**
+     * Get the streamed content from the response.
+     *
+     * @return string
+     */
+    public function getStreamedContent()
+    {
+        if (! is_null($this->streamedContent)) {
+            return $this->streamedContent;
+        }
+
+        if (! $this->baseResponse instanceof StreamedResponse) {
+            PHPUnit::fail('The response is not a streamed response.');
+        }
+
+        ob_start();
+
+        $this->sendContent();
+
+        return $this->streamedContent = ob_get_clean();
+    }
+
     /**
      * Dynamically access base response parameters.
      *