testing X-Tiler-Errors existence

test/unit/cartodb/base_controller.js

@@ -3,7 +3,7 @@ require('../../support/test_helper.js');
 var assert = require('assert');
 var errorMiddleware = require('../../../lib/cartodb/middleware/error-middleware');
 
-describe('error-middleware', function() {
+describe.only('error-middleware', function() {
 
     it('different formats for postgis plugin error returns 400 as status code', function() {
 
@@ -20,4 +20,38 @@ describe('error-middleware', function() {
             "Error status code for multiline/PSQL does not match"
         );
     });
+
+    it('should return a header with errors', function (done) {
+        const error = new Error('error test');
+
+        const req = {};
+        const res = {
+            headers: {},
+            set (key, value) {
+                this.headers[key] = value;
+            },
+            statusCode: 0,
+            status (status) {
+                this.statusCode = status;
+            },
+            json () {},
+            send () {}
+        };
+
+        const errorHeader = {
+            statusCode: 400,
+            message: error.message,
+            name: error.name,
+            moreErrors: []
+        };
+
+        const errorFn = errorMiddleware();
+        errorFn(error, req, res);
+
+        assert.deepEqual(res.headers, {
+            'X-Tiler-Errors': JSON.stringify(errorHeader)
+        });
+
+        done();
+    });
 });