diff --git a/test/karma.conf.js b/test/karma.conf.js
index c6a3d971f8be1e..91b1d74f74316b 100644
--- a/test/karma.conf.js
+++ b/test/karma.conf.js
@@ -54,6 +54,7 @@ module.exports = function setKarmaConfig(config) {
         new webpack.DefinePlugin({
           'process.env': {
             NODE_ENV: JSON.stringify('test'),
+            CI: JSON.stringify(process.env.CI),
           },
         }),
       ],