diff --git a/karma.conf.js b/karma.conf.js
index a1dc44122..07cf09ea5 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -36,7 +36,8 @@ module.exports = function (config) {
         // available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
         preprocessors: {
             "src/core/alias.js": "coverage",
-            "src/core/base.js": "coverage"
+            "src/core/base.js": "coverage",
+            "src/core/func/date.js": "coverage"
         },