Uncaught AssertionError: expected 404 to equal 405 - node.js

Question

I'm trying to test a server I have running. What I need to do is perform mocha testing on the response that the server gives. I am very new to this, so please forgive any errors that have been made.
Test is supposed to be passing, however it is not. I am very new to this, so I have not tried any alternative solutions. Thank you.
In Index.js I have:
console.log('index.js executing!');
var express = require('express');
var app = express();
app.get('/', function(req,res) {
res.send('Hello, World!');
});
app.get('/', function(req,res){
res.send('status.METHOD_NOT_ALLOWED');
});
var port = 3000;
app.listen(port,function() {
console.log('Listening on port ' + port);
});
And I am testing it with mocha :
console.log('test/test.js executing');
const chai = require('chai');
const expect = chai.expect;
const request = require('superagent');
const status = require('http-status');
const apiRoot = 'http://localhost:3000/';
describe('hello API', function(){
it('GET request returns text "Hello, World!".',function(done){
request.get(apiRoot)
.end(function(err,res){
expect(err).to.not.be.an('error');
expect(res.statusCode).to.equal(status.OK);
expect(res.text).to.equal('Hello, World!');
done();
});
});
it('POST request is not allowed',function(done){
request.post(apiRoot)
.end(function(err,res){
expect(err).to.be.an('error');
expect(res.statusCode).to.equal(status.METHOD_NOT_ALLOWED);
done();
});
});
});
The test is expected to pass.
The actual result that I am getting is:
Uncaught AssertionError: expected 404 to equal 405
+ expected - actual
-404
+405
at /home/plc/cs2410/test/test.js:26:27
at Request.callback (node_modules/superagent/lib/node/index.js:826:3)
at IncomingMessage.parser (node_modules/superagent/lib/node/index.js:1036:18)
at endReadableNT (_stream_readable.js:1129:12)
at processTicksAndRejections (internal/process/next_tick.js:76:17)
Lines 26 and 27 are:
expect(res.statusCode).to.equal(status.METHOD_NOT_ALLOWED);
done();

Answer 1

You're getting a 404 because your Express server is not listening for a POST to that endpoint. If you look, you've defined two GETs for that endpoint. You're also responding to the second request with a string that says status.METHOD_NOT_ALLOWED, not an actual 405 status code. You need to change your second app.get to something like this:
app.post('/', function(req,res){
res.send(405, 'Method Not Allowed');
});