Add test for data field in serialization errors

Author: killua1zoldyck

lib/errors.d.ts

@@ -40,8 +40,8 @@ export declare class SerializationError extends ElasticsearchClientError {
 export declare class DeserializationError extends ElasticsearchClientError {
   name: string;
   message: string;
-  data: object;
-  constructor(message: string, data: object);
+  data: string;
+  constructor(message: string, data: string);
 }
 
 export declare class ConfigurationError extends ElasticsearchClientError {

test/unit/errors.test.js

@@ -44,6 +44,7 @@ test('SerializationError', t => {
   t.true(err instanceof Error)
   t.true(err instanceof errors.ElasticsearchClientError)
   t.false(err.hasOwnProperty('meta'))
+  t.true(err.hasOwnProperty('data'))
   t.end()
 })
 
@@ -52,6 +53,7 @@ test('DeserializationError', t => {
   t.true(err instanceof Error)
   t.true(err instanceof errors.ElasticsearchClientError)
   t.false(err.hasOwnProperty('meta'))
+  t.true(err.hasOwnProperty('data'))
   t.end()
 })