[Docker/Linux] test_disk_partitions failing inside Docker

[baldoalessandro]

If I run the tests suite inside a Docker container the TestSystemAPIs.test_disk_partitions fails.

======================================================================
FAIL: psutil.tests.test_system.TestSystemAPIs.test_disk_partitions
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/lib/python3.6/psutil/tests/test_system.py", line 508, in test_disk_partitions
    assert os.path.isdir(disk.mountpoint), disk
AssertionError: sdiskpart(device='/dev/sda5', mountpoint='/etc/resolv.conf', fstype='ext4', opts='rw,relatime,errors=remount-ro,data=ordered')

Of course psutil is woking fine and if I run in Python:

import psutil as pu	
pu.disk_partitions(all=False)
[
sdiskpart(device='/dev/sda5', mountpoint='/data', fstype='ext4', opts='rw,relatime,errors=remount-ro,data=ordered'),
sdiskpart(device='/dev/sda5', mountpoint='/etc/resolv.conf', fstype='ext4', opts='rw,relatime,errors=remount-ro,data=ordered'),
sdiskpart(device='/dev/sda5', mountpoint='/etc/hostname', fstype='ext4', opts='rw,relatime,errors=remount-ro,data=ordered'),
sdiskpart(device='/dev/sda5', mountpoint='/etc/hosts', fstype='ext4', opts='rw,relatime,errors=remount-ro,data=ordered')
]

it correctly finds all the partitions.

The test is checking if the mount-point is a directory but that is not the case inside a Docker container where /etc/resolv.conf is mounted from the host.

psutil/psutil/tests/test_system.py

Line 508 in c10df5a

assert os.path.isdir(disk.mountpoint), disk

Is this something worth fixing?
Thank you for the project by the way 👍