[11.x] assertStreamed and assertNotStreamed (#54566)

* assertStreamed and assertNotStreamed

* Fix linting issue

* formatting

---------

Co-authored-by: Taylor Otwell <[email protected]>

Author: gdebrauwer

src/Illuminate/Testing/TestResponse.php

@@ -532,6 +532,36 @@ public function assertContent($value)
         return $this;
     }
 
+    /**
+     * Assert that the response was streamed.
+     *
+     * @return $this
+     */
+    public function assertStreamed()
+    {
+        PHPUnit::withResponse($this)->assertTrue(
+            $this->baseResponse instanceof StreamedResponse || $this->baseResponse instanceof StreamedJsonResponse,
+            'Expected the response to be streamed, but it wasn\'t.'
+        );
+
+        return $this;
+    }
+
+    /**
+     * Assert that the response was not streamed.
+     *
+     * @return $this
+     */
+    public function assertNotStreamed()
+    {
+        PHPUnit::withResponse($this)->assertTrue(
+            ! $this->baseResponse instanceof StreamedResponse && ! $this->baseResponse instanceof StreamedJsonResponse,
+            'Response was unexpectedly streamed.'
+        );
+
+        return $this;
+    }
+
     /**
      * Assert that the given string matches the streamed response content.
      *

tests/Testing/TestResponseTest.php

@@ -261,6 +261,39 @@ public function testAssertContent()
         }
     }
 
+    public function testAssertStreamedAndAssertNotStreamed()
+    {
+        $notStreamedResponse = $this->makeMockResponse([
+            'render' => 'expected response data',
+        ]);
+
+        $streamedResponse = TestResponse::fromBaseResponse(
+            new StreamedResponse(function () {
+                $stream = fopen('php://memory', 'r+');
+                fwrite($stream, 'expected response data');
+                rewind($stream);
+                fpassthru($stream);
+            })
+        );
+
+        $notStreamedResponse->assertNotStreamed();
+        $streamedResponse->assertStreamed();
+
+        try {
+            $notStreamedResponse->assertStreamed();
+            $this->fail('xxxx');
+        } catch (AssertionFailedError $e) {
+            $this->assertSame("Expected the response to be streamed, but it wasn't.\nFailed asserting that false is true.", $e->getMessage());
+        }
+
+        try {
+            $streamedResponse->assertNotStreamed();
+            $this->fail('xxxx');
+        } catch (AssertionFailedError $e) {
+            $this->assertSame("Response was unexpectedly streamed.\nFailed asserting that false is true.", $e->getMessage());
+        }
+    }
+
     public function testAssertStreamedContent()
     {
         $response = TestResponse::fromBaseResponse(