diff --git a/.gitignore b/.gitignore
index 54c7550..b6b062a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,7 @@ node_modules
 .yarn/*
 yarn-error.log
 *.tgz
+coverage
 
 # for debug or playing
 sandbox
\ No newline at end of file
diff --git a/package.json b/package.json
index e28a853..43283f2 100644
--- a/package.json
+++ b/package.json
@@ -39,6 +39,7 @@
   },
   "scripts": {
     "test": "jest",
+    "test:cov": "jest --coverage",
     "build": "tsup",
     "watch": "tsup --watch",
     "postbuild": "publint",