From 524cd5d512bbabef264ec5536396b6f0d2b24b8f Mon Sep 17 00:00:00 2001
From: Martin Raifer <martin@raifer.tech>
Date: Thu, 2 Jun 2022 16:58:46 +0200
Subject: [PATCH] add instructions for running tests

closes #8843
---
 CONTRIBUTING.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index fe95e28ec..44649e818 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -369,6 +369,7 @@ Test your code and make sure it passes.
 2. run `npm install`
 3. run `npm test` to see whether your tests pass or fail.
 
+Note that in order to run the tests, Chrome needs to be installed on the system. Chromium can be used as an alternative, but requires setting the environment variable `CHROME_BIN` to the corresponding executable (e.g. `export CHROME_BIN="`which chromium`"`).
 
 ### Building / Installing