Get tests passing

[jrmhaig]

Summary

WIP

Updating to get the tests working and updated for new versions of Ruby and Rails.

Other Information

• Update mimemagic in Gemfile.lock. The currently linked version was yanked.
• Update the Ubuntu image for Travis. Chrome depends on at least Xenial.

To do (help needed)

The tests are failing with the rails_5.2_no_sprockets_webpacker_* gemfiles:

module.js:550
    throw err;
    ^
Error: Cannot find module 'webpack-cli/bin/config-yargs'
    at Function.Module._resolveFilename (module.js:548:15)
    at Function.Module._load (module.js:475:25)
    at Module.require (module.js:597:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (/home/travis/build/reactjs/react-rails/test/dummy_webpacker3/node_modules/webpack-dev-server/bin/webpack-dev-server.js:84:1)
    at Module._compile (module.js:653:30)
    at Object.Module._extensions..js (module.js:664:10)
    at Module.load (module.js:566:32)
    at tryModuleLoad (module.js:506:12)
    at Function.Module._load (module.js:498:3)
Killed.

It look as though the way to start webpack has changed from webpack-dev-server to webpack server but I don't understand the codebase enough to know what needs updating for this.

For reference: webpack/webpack-dev-server#2759

[justin808]

@jrmhaig can you please resolve conflicts?

We really need to switch to GH Actions.

[jrmhaig]

Sorry, I pressed the wrong button and marked this as ready for review. Conflicts are not yet resolved.

[justin808]

@jrmhaig can you help us move to Github actions? #1193.

[justin808]

@ahangarha Please take this over and make a new PR. I'll close this issue when your PR is up.

[ahangarha]

May I know the objective of this PR? We already have migrated from travis to GitHub actions (#1198) and as far as I see, all tests pass. What issue is being addressed here? Are we still trying to use travis?

[jrmhaig]

May I know the objective of this PR? We already have migrated from travis to GitHub actions (#1198) and as far as I see, all tests pass. What issue is being addressed here? Are we still trying to use travis?

I opened this ticket over a year ago, before you migrated to Github actions. I cannot remember exactly what I was doing but I may have been trying to update it for a newer version of Rails but got stopped because I couldn't get the tests to run. I think it was somehow tied up with the mimemagic issue from about that time.

If the tests have moved to Github actions and are now working then obviously this can be closed.

[ahangarha]

@justin808 May you share your thoughts?