Jest test passed but get Error: connect ECONNREFUSED 127.0.0.1:80 at the end

So i figured out and the solution is quite easy. I cant explain why though.

this req.get('api/v1/users/') it should be /api/v1/users you need a leading /.

For Frontend...

If you are making use of axios and come across this error, go to the testSetup.js file and add this line

axios.defaults.baseURL = "https://yourbaseurl.com/"

This worked for me. So, typically, this is a baseURL issue.