987119 - browser_bug816527.js always passes when run in isolation, even if breaking the code that it's testing

Status: NEW

(Firefox :: Private Browsing, defect)

Description

[:Gijs (he/him)]

STR:

1. Comment out the early return at:

http://hg.mozilla.org/mozilla-central/annotate/fa098f9fe89c/browser/base/content/browser.js#l6891

2. Run ./mach mochitest-browser browser/base/content/test/general/browser_bug816527.js

ER:
the test fails

AR:
the test passes

If you run even one other test before it, the test *will* fail, as expected, but that means it seems to depend on... something... of which there is no guarantee. I haven't investigated any further.