diff --git doc/RUNNING_TESTS doc/RUNNING_TESTS
index fa4737e11..99241a293 100644
--- doc/RUNNING_TESTS
+++ doc/RUNNING_TESTS
@@ -107,3 +107,12 @@ Install Stylelint:
 
 You can run Stylelint with:
 `node_modules/.bin/stylelint "public/stylesheets/**/*.css"`
+
+Running JavaScript unit test
+=============================
+
+As with stylelint, introduce node(ver16 or later) and yarn(1.22).
+
+You can run JavaScript unit test
+
+`yarn test`