Tested on version 12

I'm not able to run my js tests because packages are missing :

• python websocket-client package
• chromium-browser package

Step to reproduce:

Run a test with js web_tour

Displayed in logs:

WARNING db odoo.addons.my_addon.tests.test_js.TestJS: websocket-client module is not installed
INFO db odoo.addons.my_addon.tests.test_js: skipped 'websocket-client module is not installed'

After I have installed websocket-client in container:
INFO db odoo.addons.my_addon.tests.test_js: skipped 'Chrome executable not found'

It says 'Chrome executable not found' because you haven't installed yet.

I'm sorry to say that the Odoo Docker image is not really made for development.
We want to keep the image as small as possible, so we do not plan to put Chrome on the image.
I think that the best option is to use your own image, derived from the base Odoo image.
Then add, chrome, websocket-client ...

We want to keep the image as small as possible, so we do not plan to put Chrome on the image.

In this case I think I will have some pull requests.