Added tests for health checking

src/node/health_check/health.js

@@ -51,11 +51,12 @@ HealthImplementation.prototype.setStatus = function(service, status) {
 
 HealthImplementation.prototype.check = function(call, callback){
   var service = call.request.service;
+  debugger;
   callback(null, {status: _.get(this.statusMap, service, 'UNSPECIFIED')});
 };
 
 module.exports = {
   Client: HealthClient,
-  Service: HealthClient.service,
+  service: HealthClient.service,
   Implementation: HealthImplementation
 };