diff --git a/src/js/calculator/helsinki_benefit_amount_estimate/tests/.nvmrc b/src/js/calculator/helsinki_benefit_amount_estimate/tests/.nvmrc
new file mode 100644
index 000000000..209e3ef4b
--- /dev/null
+++ b/src/js/calculator/helsinki_benefit_amount_estimate/tests/.nvmrc
@@ -0,0 +1 @@
+20
diff --git a/src/js/calculator/helsinki_benefit_amount_estimate/tests/README.md b/src/js/calculator/helsinki_benefit_amount_estimate/tests/README.md
index 195461ee1..92eeaf6a9 100644
--- a/src/js/calculator/helsinki_benefit_amount_estimate/tests/README.md
+++ b/src/js/calculator/helsinki_benefit_amount_estimate/tests/README.md
@@ -4,13 +4,13 @@
 
 Needed:
 
-* node installed, tested to be working with at least v18
+* node installed
 * optionally, a display and a OS with GUI for headed tests
 
 To install playwright and it's dependencies:
 
 ```
-npm install
+nvm use && npm install
 npm run test:install
 ```
 
@@ -38,4 +38,14 @@ Run tests line-by-line:
 npm run test:debug
 ```
 
----
\ No newline at end of file
+---
+
+## To run manual tests on local
+
+* Start a local server on **drupal-hdbt/**, for instance `npx http-server -p 3001`
+* Open http://localhost:3001/src/js/calculator/helsinki_benefit_amount_estimate/helsinki-benefit-test.html on your browser.
+
+## To run automatic browser tests
+This requires test dependencies to be installed
+
+`cd src/js/calculator/helsinki_benefit_amount_estimate/tests && npm run test`