[JavaScript] add enum tests cases for JS generator (java) (#3546)

* add enum tests cases for JS generator (java)

* fix typo quote

samples/client/petstore/javascript/docs/FakeApi.md

@@ -4,10 +4,55 @@ All URIs are relative to *http://petstore.swagger.io/v2*
 
 Method | HTTP request | Description
 ------------- | ------------- | -------------
+[**testClientModel**](FakeApi.md#testClientModel) | **PATCH** /fake | To test \"client\" model
 [**testEndpointParameters**](FakeApi.md#testEndpointParameters) | **POST** /fake | Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
 [**testEnumQueryParameters**](FakeApi.md#testEnumQueryParameters) | **GET** /fake | To test enum query parameters
 
 
+<a name="testClientModel"></a>
+# **testClientModel**
+> Client testClientModel(body)
+
+To test \&quot;client\&quot; model
+
+### Example
+```javascript
+var SwaggerPetstore = require('swagger_petstore');
+
+var apiInstance = new SwaggerPetstore.FakeApi();
+
+var body = new SwaggerPetstore.Client(); // Client | client model
+
+
+var callback = function(error, data, response) {
+  if (error) {
+    console.error(error);
+  } else {
+    console.log('API called successfully. Returned data: ' + data);
+  }
+};
+apiInstance.testClientModel(body, callback);
+```
+
+### Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **body** | [**Client**](Client.md)| client model | 
+
+### Return type
+
+[**Client**](Client.md)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: application/json
+ - **Accept**: application/json
+
 <a name="testEndpointParameters"></a>
 # **testEndpointParameters**
 > testEndpointParameters(_number, _double, _string, _byte, opts)