add health endpoint

lib/actuatorMiddleware.js

@@ -3,20 +3,24 @@
 var express = require('express');
 var infoRoute = require('./infoRoute');
 var metricsRoute = require('./metricsRoute');
+var healthRoute = require('./healthRoute');
 
 module.exports = function actuatorMiddleware(endpoint) {
     var router = express.Router();
 
     var infoPath = '/info';
     var metricsPath = '/metrics';
+    var healthPath = "/health";
 
     if (endpoint) {
         infoPath = endpoint + infoPath;
         metricsPath = endpoint + metricsPath;
+        healthPath = endpoint + healthPath;
     }
 
     router.get(infoPath, infoRoute);
     router.get(metricsPath, metricsRoute);
+    router.get(healthPath, healthRoute);
 
     return router;
 };

lib/healthRoute.js

@@ -0,0 +1,7 @@
+'use strict';
+
+module.exports = function metrics(req, res) {
+    res.status(200).json({
+        status: "UP"
+    });
+};

test/functional/health.test.js

@@ -0,0 +1,31 @@
+'use strict';
+
+const request = require('supertest');
+const express = require('express');
+const expect = require('chai').expect;
+const actuator = require('../../lib/actuatorMiddleware.js');
+
+let app;
+
+describe('GET /health', function() {
+    beforeEach(function() {
+        app = express();
+        app.use(actuator());
+    });
+
+    afterEach(function() {
+        app.close;
+    });
+
+    it('should return status UP', function(done) {
+        request(app)
+            .get('/health')
+            .end(function(err, res) {
+                expect(res.statusCode).to.equal(200);
+                expect(res.headers['content-type']).to.equal('application/json; charset=utf-8');
+                expect(res.body.status).to.equal("UP");
+                done();
+            });
+    });
+
+});

test/unit/lib/actuatorMiddlewareSpec.test.js

@@ -34,14 +34,14 @@ describe('actuator middleware', function () {
     it('should mount the info route on the default endpoint', function () {
         actuator();
 
-        expect(router.get).to.have.been.calledTwice;
+        expect(router.get).to.have.been.calledThrice;
         expect(router.get).to.have.been.calledWithExactly('/info', infoRoute);
     });
 
     it('should mount the info route on the given endpoint', function () {
         actuator('/foobar');
 
-        expect(router.get).to.have.been.calledTwice;
+        expect(router.get).to.have.been.calledThrice;
         expect(router.get).to.have.been.calledWithExactly('/foobar/info', infoRoute);
     });
 });