fix test script

Author: michaelficarra

package.json

@@ -7,7 +7,7 @@
   "scripts": {
     "build": "tsc",
     "spec": "ecmarkup --mark-effects --load-biblio @tc39/ecma262-biblio --load-biblio ./proposal-iterator-helpers-biblio.json --write-biblio biblio.json --lint-spec --strict spec.emu --assets-dir dist dist/index.html",
-    "test": "node --test test"
+    "test": "node --test test/**/*.mjs"
   },
   "repository": {
     "type": "git",