diff --git a/package.json b/package.json
index c7191fd01..59de8b843 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
     "clean": "rm -fr dist",
     "cleanall": "rm -fr dist node_modules",
     "build": "tsc && node --no-warnings=ExperimentalWarning -r ts-node/register ./scripts/copy-files",
-    "test": "jest",
+    "test": "yarn gen:grammar && jest",
     "coverage": "cross-env COVERAGE=true jest",
     "release": "yarn clean && yarn build && yarn coverage && yarn release-it --npm.yarn1",
     "type": "tsc --noEmit",