Simple example for testing an HTML endpoint in node with supertest and chai. Most examples only test API endpoints it seems.

app.js

const express = require("express");
const mustache = require("mustache-express");
const bodyParser = require("body-parser");
const app = express();
// Rest of the stuff here

// DONT FORGET THIS
module.exports = app;

root_test.js

const request = require("supertest");
const assert = require("chai").assert;
const app = require("../app");

describe("GET /", function(){
  it("is 200", function(done){

    request(app)
      .get("/")
      .expect("Content-type",/html/)
      .expect(200)
      .end(function(err, res){
        assert.include(res.text, "Games")
        done()
      })
  })
})