[11.x] json assertions on streamed content (#54565)

* json assertions on streamed content

* Update TestResponse.php

---------

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

Author: gdebrauwer

src/Illuminate/Testing/TestResponse.php

@@ -1049,7 +1049,12 @@ public function assertJsonIsObject($key = null)
      */
     public function decodeResponseJson()
     {
-        $testJson = new AssertableJsonString($this->getContent());
+        if ($this->baseResponse instanceof StreamedResponse || 
+            $this->baseResponse instanceof StreamedJsonResponse) {
+            $testJson = new AssertableJsonString($this->streamedContent());
+        } else {
+            $testJson = new AssertableJsonString($this->getContent());
+        }
 
         $decodedResponse = $testJson->json();
 

tests/Testing/TestResponseTest.php

@@ -325,6 +325,40 @@ public function testAssertStreamedJsonContent()
         }
     }
 
+    public function testJsonAssertionsOnStreamedJsonContent()
+    {
+        $response = TestResponse::fromBaseResponse(
+            new StreamedJsonResponse([
+                'data' => $this->yieldTestModels(),
+            ])
+        );
+
+        $response->assertJsonPath('data', [
+            ['id' => 1],
+            ['id' => 2],
+            ['id' => 3],
+        ]);
+
+        try {
+            $response->assertJsonPath('data', [
+                ['id' => 1],
+                ['id' => 2],
+            ]);
+            $this->fail('xxxx');
+        } catch (AssertionFailedError $e) {
+            $this->assertSame('Failed asserting that two arrays are identical.', $e->getMessage());
+        }
+
+        $response->assertJsonCount(3, 'data');
+
+        try {
+            $response->assertJsonCount(2, 'data');
+            $this->fail('xxxx');
+        } catch (AssertionFailedError $e) {
+            $this->assertSame("Failed to assert that the response count matched the expected 2\nFailed asserting that actual size 3 matches expected size 2.", $e->getMessage());
+        }
+    }
+
     public function yieldTestModels()
     {
         yield new TestModel(['id' => 1]);