[test] add test for mathjax#309

Author: pkra

test/userconfig-jax.js

@@ -0,0 +1,20 @@
+var tape = require('tape');
+var mjAPI = require('../lib/main.js');
+var jsdom = require('jsdom').jsdom;
+
+tape('User configuration with jax array', function (t) {
+        t.plan(1);
+
+        mjAPI.config({
+                MathJax: {
+                        jax: ["input/MathML", "output/SVG"]
+                }
+        });
+        mjAPI.typeset({
+                math: '<math><mn>1</mn></math>',
+                format: 'MathML',
+                svg: true
+        }, function (data) {
+                t.ok(!data.errors, 'No errors');
+        });
+});