feat(#3): implement initial public API tests

test/response.util.ts

@@ -0,0 +1,22 @@
+
+export function successResponseList() {
+  return {
+    "ext_code": "",
+    "ext_info": "",
+    "result": expect.any(Array),
+    "ret_code": 0,
+    "ret_msg": "OK",
+    "time_now": expect.any(String),
+  };
+};
+
+export function successResponseObject() {
+  return {
+    "ext_code": "",
+    "ext_info": "",
+    "result": expect.any(Object),
+    "ret_code": 0,
+    "ret_msg": "OK",
+    "time_now": expect.any(String),
+  };
+};