QA: interface_rest: Check /mempool/info/with_fee_histogram matches RPC

Author: luke-jr

test/functional/interface_rest.py

@@ -345,6 +345,9 @@ def run_test(self):
         for obj in [json_obj, mempool_info]:
             obj.pop("unbroadcastcount")
         assert_equal(json_obj, mempool_info)
+        json_obj = self.test_rest_request("/mempool/info/with_fee_histogram")
+        mempool_info = self.nodes[0].getmempoolinfo(with_fee_histogram=True)
+        assert_equal(json_obj, mempool_info)
 
         # Check that there are our submitted transactions in the TX memory pool
         json_obj = self.test_rest_request("/mempool/contents")