diff --git a/core/misc/tests/drupal.test.js b/core/misc/tests/drupal.test.js
new file mode 100644
index 0000000..a4f274d
--- /dev/null
+++ b/core/misc/tests/drupal.test.js
@@ -0,0 +1,15 @@
+const assert = require('assert');
+const jsdom = require('jsdom');
+domready = function () {};
+Drupal = {};
+const _ = require('../drupal.es6');
+
+describe('Drupal', function () {
+  describe('#checkPlain()', function () {
+    it('should escape html strings safe for printing', function () {
+      const html = '<span class="music">Rock & roll</span>';
+      const escaped = '&lt;span class=&quot;music&quot;&gt;Rock &amp; roll&lt;/span&gt;';
+      assert.strictEqual(Drupal.checkPlain(html), escaped, 'Drupal.checkPlain escape HTML strings');
+    });
+  });
+});