fix(keep-alive): dont pass undefined property

resolves PERS-OPS

lib/wrapper.js

@@ -34,11 +34,14 @@ class RequestWrapper {
       transformResponse: [body => body],
       maxContentLength: this.requestOptions.maxContentLength,
       validateStatus: () => true,
-      cancelToken: source.token,
-      httpAgent: this.requestOptions.httpAgent,
-      httpsAgent: this.requestOptions.httpsAgent
+      cancelToken: source.token
     };
 
+    if (this.requestOptions.httpAgent && this.requestOptions.httpsAgent) {
+      axiosOptions.httpAgent = this.requestOptions.httpAgent;
+      axiosOptions.httpsAgent = this.requestOptions.httpsAgent;
+    }
+
     return axios
       .request(axiosOptions)
       .then(

lib/wrapper.spec.js

@@ -4,6 +4,8 @@ const axios = require('axios');
 const Wrapper = require('./wrapper');
 const SuiteRequestError = require('./requestError');
 const RequestOption = require('./requestOption');
+const http = require('http');
+const https = require('https');
 
 describe('Wrapper', function() {
   let apiResponse;
@@ -73,6 +75,25 @@ describe('Wrapper', function() {
       expect(response).to.be.eql(expectedApiResponse);
       const requestArgument = requestGetStub.args[0][0];
       expect(requestArgument).to.containSubset(expectedRequestOptions);
+      expect(requestArgument).not.to.have.own.property('httpAgent');
+      expect(requestArgument).not.to.have.own.property('httpsAgent');
+    });
+
+    it('should pass http agents to axios', function *() {
+      const agents = {
+        httpAgent: new http.Agent({ keepAlive: true }),
+        httpsAgent: new https.Agent({ keepAlive: true })
+      };
+      wrapper = new Wrapper(
+        Object.assign(agents, escherRequestOptions),
+        'http:'
+      );
+
+      yield wrapper.send();
+
+      const requestArgument = requestGetStub.args[0][0];
+      expect(requestArgument.httpAgent).to.eql(agents.httpAgent);
+      expect(requestArgument.httpsAgent).to.eql(agents.httpsAgent);
     });
 
     it('should throw error when response code is 400 or above', function *() {