Add test

test/acceptance/cache.js

@@ -1,21 +0,0 @@
-'use strict';
-
-var server = require('../../app/server')();
-const assert = require('../support/assert');
-
-describe('Cache', function () {
-    it('should return a Vary header', function (done) {
-        assert.response(server, {
-            url: '/api/v1/sql?api_key=1234&g=select%20*%20from%20untitle_table_4',
-            headers: {
-                host: 'vizzuality.cartodb.com'
-            },
-            method: 'GET'
-        },
-        {},
-        function(err, res) {
-            assert.equal(res.headers.vary, 'Authorization');
-            done();
-        });
-    });
-});