595392 - Add tests to ensure consistent behavior when both packed and unpacked extensions of the same ID are installed

Status: RESOLVED INVALID

Description

[Michael Wu [:mwu]]

From comment 101 in bug 533038:

The code as-is does the following:

If both xpi and unpackaged directory exist in the staging directory then both
will get installed into the install location. The ordering of directoryEntries
determines which ends up installed. Presumably directoryEntries gives us a
fixed ordering (maybe based on filesystem type?) but I think we should add a
test to this to ensure it matches across platforms.

The same is basically true of the install location itself. _readAddons doesn't
do any checking to see if both types were found so whichever is seen last wins.
Another test should be added.