diff --git a/test/saucelabs/karma.conf.js b/test/saucelabs/karma.conf.js
index f7a3e275d..80e79712f 100644
--- a/test/saucelabs/karma.conf.js
+++ b/test/saucelabs/karma.conf.js
@@ -66,13 +66,20 @@ module.exports = config => {
         watched: true,
         served: true
       },
+      {
+        pattern: "test/specs/*.spec.mjs",
+        included: true,
+        watched: true,
+        served: true,
+        type: "module"
+      },
       {
         pattern: "test/**/*.+(svg|png|jpg|jpeg|ttf|txt)",
         included: false,
         served: true
       },
       {
-        pattern: "test/reference/**/*.pdf",
+        pattern: "test/reference/**/*.*",
         included: false,
         watched: false,
         served: true