1255095 - Make mochitest chrome produce an error when run with --e10s

Status: NEW

(Testing :: Mochitest, defect)

Description

[Andrew McCreight [:mccr8]]

Over and over again I see people running mochitest chrome tests with --e10s, and when they see that it works, they assume things are working with e10s, when in fact as far as I am aware the flag is just ignored. (The latest is bug 1254806 comment 32.) The test harness should really produce an error so people aren't misled.

Comment 1

[Karl Tomlinson (:karlt)]

https://wiki.mozilla.org/Electrolysis/e10s_test_tips#Browser-chrome says

"You can run a mochitest-chrome test in a multi-process environment with:

 mach mochitest --e10s <testname>"

I guess s/mochitest-chrome/browser-chrome/ is intended there?

Comment 2

[Karl Tomlinson (:karlt)]

(In reply to Karl Tomlinson (ni?:karlt) from comment #1)
> I guess s/mochitest-chrome/browser-chrome/ is intended there?

I made that change to the wiki.

Comment 3

[Blake Kaplan (:mrbkap) (inactive, use needinfo)]

Yep, thanks for fixing that!

Comment 4

[Andrew Halberstadt [:ahal]]

Bug 1243083 will replace --e10s with --disable-e10s. Will that be a good enough alternative to an error message?

Comment 5

[Blake Kaplan (:mrbkap) (inactive, use needinfo)]

I think that makes the situation even more confusing.