diff --git a/core/src/main.js b/core/src/main.js
index 21de7b9d..7469b072 100644
--- a/core/src/main.js
+++ b/core/src/main.js
@@ -8,7 +8,7 @@
  * LICENSE file in the root directory of this source tree.
 */
 
-const tests = false;
+const tests = typeof PRODUCTION === 'undefined';
 
 import path from 'path';
 import sass from 'node-sass';