Added a snippet for observing the browser when running e2e tests (#13993

) * Added a snippet for observing the browser when running e2e tests
WordPress · Feb 21, 2019 · c602240 · c602240
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commit c602240
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diff --git a/docs/contributors/testing-overview.md b/docs/contributors/testing-overview.md
@@ -356,6 +356,12 @@ or interactively
 npm run test-e2e:watch
 ```
 
+Sometimes it's useful to observe the browser while running tests. To do so you can use these environment variables:
+
+```bash
+PUPPETEER_HEADLESS=false PUPPETEER_SLOWMO=80 npm run test-e2e:watch
+```
+
 If you're using a different setup, you can provide the base URL, username and password like this:
 
 ```bash