init

src/index.ts

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+import cfenv from 'cfenv';
+import express from 'express';
+import mongoose from 'mongoose';
+import swagger from 'swagger-ui-express';
+import yaml from 'yamljs';
+
+
+// tell if server is running in debug or production environment
+console.log(process.env.NODE_ENV === 'production' ? '===== PRODUCTION =====' : '===== DEVELOPMENT =====');
+
+
+// get mongodb address from server, otherwise set to localhost
+let connectionString: string = "";
+if(process.env.NODE_ENV === 'production') {
+  let services = cfenv.getAppEnv().getServices();
+  for (let service in services) {
+    if(services[service].tags.indexOf("mongodb") >= 0) {
+      connectionString = services[service]["credentials"].uri;
+    }
+  }
+}
+else {
+  connectionString = 'mongodb://localhost/dfopdb';
+}
+mongoose.connect(connectionString, {useNewUrlParser: true, useUnifiedTopology: true});
+
+// connect to mongodb
+let db = mongoose.connection;
+db.on('error', console.error.bind(console, 'connection error:'));
+db.once('open', () => {
+  console.log(`Connected to ${connectionString}`);
+});
+
+
+// create Express app
+const app = express();
+app.disable('x-powered-by');
+
+// get port from environment, defaults to 3000
+const port = process.env.PORT || 3000;
+
+// require routes
+app.use('/', require('./routes/root'));
+
+// Swagger UI
+app.use('/api', swagger.serve, swagger.setup(
+  yaml.load('./oas.yml'),
+  {
+    defaultModelsExpandDepth: -1,
+    customCss: '.swagger-ui .topbar { display: none }'
+  }
+  )
+);
+
+// hook up server to port
+app.listen(port, () => {
+  console.log(`Listening on http;//localhost:${port}`);
+});

src/routes/root.spec.ts

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+import supertest from 'supertest';
+import should from 'should/as-function';
+
+
+let server = supertest.agent('http://localhost:3000');
+
+describe('Testing /', () => {
+  it('returns the message object', done => {
+    server
+      .get('/')
+      .expect('Content-type', /json/)
+      .expect(200)
+      .end(function(err, res) {
+        should(res.statusCode).equal(200);
+        should(res.body).be.eql({message: 'API server up and running!'});
+        done();
+      });
+  });
+});

src/routes/root.ts

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+import express from 'express';
+
+const router = express.Router();
+
+router.get('/', (req, res) => {
+  res.json({message: 'API server up and running!'});
+});
+
+module.exports = router;