Testcase 'nm' fails with the following error:

[...]
<debug> [1520858777.1546] disown NMNetns singleton (0xaaab00c6a980)
<debug> [1520858777.1555] disown NMLinuxPlatform singleton (0xaaab00c8b0e0)
<debug> [1520858777.1566] disown NMConfig singleton (0xaaab00c74010)

------

test_open_b_ip4 (__main__.ColdplugWifi)
Open network, 802.11b, IPv4 ... ok
test_open_b_ip6_dhcp (__main__.ColdplugWifi)
Open network, 802.11b, IPv6 with DHCP, preferring temp address ... ok
test_open_b_ip6_raonly_no_pe (__main__.ColdplugWifi)
Open network, 802.11b, IPv6 with only RA, PE disabled ... ok
test_open_b_ip6_raonly_pubaddr (__main__.ColdplugWifi)
Open network, 802.11b, IPv6 with only RA, preferring public address ... ok
test_open_b_ip6_raonly_tmpaddr (__main__.ColdplugWifi)
Open network, 802.11b, IPv6 with only RA, preferring temp address ... ok
test_open_g_ip4 (__main__.ColdplugWifi)
Open network, 802.11g, IPv4 ... ok
test_rfkill (__main__.ColdplugWifi)
shut down connection on killswitch, restore it on unblock ... ok
test_wpa1_ip4 (__main__.ColdplugWifi)
WPA1, 802.11g, IPv4 ... ok
test_wpa2_ip4 (__main__.ColdplugWifi)
WPA2, 802.11g, IPv4 ... ok
test_wpa2_ip6 (__main__.ColdplugWifi)
WPA2, 802.11g, IPv6 with only RA ... ok
test_auto_detect_ap (__main__.Hotplug)
new AP is being detected automatically within 30s ... expected failure
test_auto_detect_eth (__main__.Hotplug)
new eth router is being detected automatically within 30s ... RTNETLINK answers: File exists
/tmp/autopkgtest.0FzbS3/build.GsE/src/debian/tests/nm:23: PyGIWarning: NetworkManager was imported without specifying a version first. Use gi.require_version('NetworkManager', '1.0') before import to ensure that the right version gets loaded.
  from gi.repository import NetworkManager, NMClient, GLib
/tmp/autopkgtest.0FzbS3/build.GsE/src/debian/tests/nm:23: PyGIWarning: NMClient was imported without specifying a version first. Use gi.require_version('NMClient', '1.0') before import to ensure that the right version gets loaded.
  from gi.repository import NetworkManager, NMClient, GLib
expected failure

======================================================================
FAIL: test_no_ap (__main__.ColdplugWifi)
no available access point
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/autopkgtest.0FzbS3/build.GsE/src/debian/tests/network_test_base.py", line 359, in wrapped
    args[0].wrap_process(fn, *args, **kwargs)
  File "/tmp/autopkgtest.0FzbS3/build.GsE/src/debian/tests/network_test_base.py", line 263, in wrap_process
    self.fail(f.read())
AssertionError: Traceback (most recent call last):
  File "/tmp/autopkgtest.0FzbS3/build.GsE/src/debian/tests/network_test_base.py", line 252, in wrap_process
    fn(*args, **kwargs)
  File "/tmp/autopkgtest.0FzbS3/build.GsE/src/debian/tests/nm", line 406, in test_no_ap
    self.assertTrue(self.nmdev_w.props.managed)
  File "/usr/lib/python3.6/unittest/case.py", line 682, in assertTrue
    raise self.failureException(msg)
AssertionError: False is not true


----------------------------------------------------------------------
Ran 19 tests in 360.943s

FAILED (failures=1, expected failures=2)
autopkgtest [12:50:41]: test nm: -----------------------]
autopkgtest [12:50:41]: test nm:  - - - - - - - - - - results - - - - - - - - - -
nm                   FAIL non-zero exit status 1