'How to run Karma tests from docker container?

I've recently moved my node.js app into a docker image and I'd like to run my tests inside the image. My mocha/node tests work fine but the Karma tests involve starting Chrome to run the tests and Chrome isn't installed in the container.

How do I go about addressing this?

Install Chrome in the Container? Seems less than ideal as I don't want to ship Chrome to my production servers inside the container.
Somehow allow it to connect to Chrome on the host?
Create a new image that inherits from my app image and adds Chrome and other things?

Googling 'docker & karma' reveals docker images out there but I can't find instructions on how to think about the problem and the best approach.

Solution 1:^[1]

I've found this docker image to be an excellent starting point for running karma tests quickly inside a docker container on Concourse CI:

https://hub.docker.com/r/markadams/chromium-xvfb-js/

It contains node 6.x (latest) + npm and a headless chromium instance using X virtual framebuffer. Working great for me!

Solution 2:^[2]

There is also protractor-runner project, and Karma is similar to running Protractor, and so you might be able to learn how to do it from that example. But, I prefer the suggestion to use chromium-xvfb-js image.

Solution 3:^[3]

You can try this (tested in Alpine Linux):

Option 1

Ensure that the 9876 port is accessible from the host.

Install chromium:

 apk add chromium # NOT google-chrome-stable

Create a wrapper script that starts chromium-browser in headless mode:

 vi /usr/bin/google-chrome-stable

Add the following lines:

 #!/bin/sh

 chromium-browser \
 --no-sandbox \
 --headless \
 --disable-gpu \
 --remote-debugging-port=9222 \
 "$@"

Make it executable:

 chmod +x /usr/bin/google-chrome-stable

Run the tests in headless mode:
```
 ng test --browsers ChromeHeadless
```

Option 2

You can also run the browser in a virtual X Server called Xvfb:

Remove the --headless option in the /usr/bin/google-chrome-stable script.

Start the server and export the DISPLAY vairable:

 Xvfb :1 -ac -screen 0 1024x768x24 &
 export DISPLAY=:1

Run the tests:
```
 ng test
```

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	Johannes Rudolph
Solution 2	djangofan
Solution 3

'How to run Karma tests from docker container?

Solution 1:[1]

Solution 2:[2]

Solution 3:[3]

Sources

Related Questions

Solution 1:^[1]

Solution 2:^[2]

Solution 3:^[3]