[webpack] Precompile assets on test env

[didierofrivia]

What this PR does / why we need it:

Fixes possible stale assets when running the test battery

[hallelujah]

Don't we need to edit that too?

porta/config/webpacker.yml

Lines 42 to 44 in 6e8c916

	test:
	<<: *default
	compile: true

[didierofrivia]

@hallelujah that's set alright aleady :)

[guicassolato]

This also means that the builds will take a bit longer. I hope it helps. :/

[hallelujah]

Hmm approved but if we are pre-compiling then better setting compile: false
At least it will behave like in production environment which is good as we will know if something went wrong

[hallelujah]

Dismissing approval

[hallelujah]

So when developing you will need to pre-compile the assets everytime? Or does webpacker-dev-server do it for you? Would be good to add some instructions here or probably use some environment to control this.

[didierofrivia]

on development the assets will be compiled when they are required. You could also use webpacker-dev-server for autoloading and other debugging goodness

[hallelujah]

But this states that they will not be compiled when you test locally

[didierofrivia]

not the tests, sadly, you'll need to precompile them manually.

[hallelujah]

That is a no go without instructions. But can't we have this with environment switch?

compile: <%=  ENV.fetch('WEBPACKER_COMPILE', true) %>

Then in the CI build set this environment to false

[hallelujah]

Answering: rails/webpacker#956

So no :/