Add assertJsonFragment()

src/Illuminate/Foundation/Testing/TestResponse.php

@@ -199,6 +199,30 @@ public function assertJson(array $data)
         return $this;
     }
 
+    /**
+     * Assert that the response contains the given JSON fragment.
+     *
+     * @param  array  $data
+     * @return $this
+     */
+    public function assertJsonFragment(array $data)
+    {
+        $actual = json_encode(Arr::sortRecursive(
+            (array) $this->decodeResponseJson()
+        ));
+
+        foreach (Arr::sortRecursive($data) as $key => $value) {
+            $expected = substr(json_encode([$key => $value]), 1, -1);
+
+            PHPUnit::assertTrue(
+                Str::contains($actual, $expected),
+                'Unable to find JSON fragment'.PHP_EOL."[{$expected}]".PHP_EOL.'within'.PHP_EOL."[{$actual}]."
+            );
+        }
+
+        return $this;
+    }
+
     /**
      * Assert that the response has the exact given JSON.
      *