======================================================================
FAIL: mkfs observes extra_opts and overwrite settings when cmd is not
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Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/mock/mock.py", line 1305, in patched
    return func(*args, **keywargs)
  File "/root/cloud-init/tests/unittests/test_handler/test_handler_disk_setup.py", line 203, in test_overwrite_and_extra_opts_without_cmd
    shell=False)
  File "/usr/lib/python2.7/site-packages/mock/mock.py", line 947, in assert_called_once_with
    raise AssertionError(msg)
AssertionError: Expected 'subp' to be called once. Called 0 times.
-------------------- >> begin captured logging << --------------------
cloudinit.config.cc_disk_setup: DEBUG: Checking /dev/xdb1 against default devices
cloudinit.config.cc_disk_setup: DEBUG: Identifying device to create without_cmd filesytem on
cloudinit.config.cc_disk_setup: DEBUG: Automatic device for /dev/xdb1 identified as /dev/xdb1
cloudinit.config.cc_disk_setup: DEBUG: File system type 'ext4' with label 'without_cmd' will be created on /dev/xdb1
cloudinit.config.cc_disk_setup: WARNING: Cannot create fstype 'ext4'.  No mkfs.ext4 command
--------------------- >> end captured logging << ---------------------