def test_dmesg_wrap_partial():
""" Test that dmesg still works after dmesg wraps partially
We can overwrite the DMESG_COMMAND class variable to emluate dmesg being
filled up and overflowing. What this test does is starts with a string that
looks like this: "a\nb\nc\n" (this is used to emluate the contents of
dmesg), we then replace that with "b\nc\nd\n", and ensure that the update
of dmesg contains only 'd', becasue 'd' is the only new value in the
updated dmesg.
"""
# We don't want weird side effects of changing DMESG_COMMAND globally, so
# instead we set it as a class instance and manually clear the
# _last_messages attribute
test = dmesg.LinuxDmesg()
test.DMESG_COMMAND = ['echo', 'a\nb\nc\n']
test.update_dmesg()
# Update the DMESG_COMMAND to add d\n and remove a\n, this simluates the
# wrap
test.DMESG_COMMAND = ['echo', 'b\nc\nd\n']
test.update_dmesg()
nt.assert_items_equal(test._new_messages, ['d'],
msg=("_new_messages should be equal to ['d'], but is"
" {} instead.".format(test._new_messages)))
def test_dmesg_wrap_partial():
"""dmesg.Dmesg.update_dmesg(): still works after partial wrap of dmesg
We can overwrite the DMESG_COMMAND class variable to emluate dmesg being
filled up and overflowing. What this test does is starts with a string that
looks like this: "a\nb\nc\n" (this is used to emluate the contents of
dmesg), we then replace that with "b\nc\nd\n", and ensure that the update
of dmesg contains only 'd', becasue 'd' is the only new value in the
updated dmesg.
"""
# We don't want weird side effects of changing DMESG_COMMAND globally, so
# instead we set it as a class instance and manually clear the
# _last_messages attribute
test = dmesg.LinuxDmesg()
test.DMESG_COMMAND = ["echo", "a\nb\nc\n"]
test.update_dmesg()
# Update the DMESG_COMMAND to add d\n and remove a\n, this simluates the
# wrap
test.DMESG_COMMAND = ["echo", "b\nc\nd\n"]
test.update_dmesg()
nt.assert_items_equal(
test._new_messages,
["d"],
msg=("_new_messages should be equal to ['d'], but is" " {} instead.".format(test._new_messages)),
)
def sudo_test_update_dmesg_without_updates():
""" update_dmesg() does not update results when there is no change in dmesg
This will skip on non-Posix systems, since there is no way to actually test
it.
Because this test needs to write into the dmesg ringbuffer to assure that
the ringbuffer has changed and that our class successfully catches that
change it requires root access, gained by sudo. In the event that it cannot
get sudo it will skip.
"""
test = _get_dmesg()
test.update_dmesg()
nt.assert_equal(test._new_messages, [],
msg=("{0} returned updates, even when dmesg has not been "
"updated.".format(test.__class__)))
def sudo_test_update_dmesg_without_updates():
""" update_dmesg() does not update results when there is no change in dmesg
This will skip on non-Posix systems, since there is no way to actually test
it.
Because this test needs to write into the dmesg ringbuffer to assure that
the ringbuffer has changed and that our class successfully catches that
change it requires root access, gained by sudo. In the event that it cannot
get sudo it will skip.
"""
test = _get_dmesg()
test.update_dmesg()
nt.assert_equal(test._new_messages, [],
msg=("{0} returned updates, even when dmesg has not been "
"updated.".format(test.__class__)))
def test_dmesg_wrap_complete():
""" Test that dmesg still works after dmesg wraps completely
just like the partial version, but with nothingin common.
"""
# We don't want weird side effects of changing DMESG_COMMAND globally, so
# instead we set it as a class instance and manually clear the
# _last_messages attribute
test = dmesg.LinuxDmesg()
test.DMESG_COMMAND = ['echo', 'a\nb\nc\n']
test.update_dmesg()
# Udamte the DMESG_COMMAND to add d\n and remove a\n, this simluates the
# wrap
test.DMESG_COMMAND = ['echo', '1\n2\n3\n']
test.update_dmesg()
nt.assert_items_equal(test._new_messages, ['1', '2', '3'],
msg=("_new_messages should be equal to "
"['1', '2', '3'], but is {} instead".format(
test._new_messages)))
def test_dmesg_wrap_complete():
""" Test that dmesg still works after dmesg wraps completely
just like the partial version, but with nothingin common.
"""
# We don't want weird side effects of changing DMESG_COMMAND globally, so
# instead we set it as a class instance and manually clear the
# _last_messages attribute
test = dmesg.LinuxDmesg()
test.DMESG_COMMAND = ['echo', 'a\nb\nc\n']
test.update_dmesg()
# Udamte the DMESG_COMMAND to add d\n and remove a\n, this simluates the
# wrap
test.DMESG_COMMAND = ['echo', '1\n2\n3\n']
test.update_dmesg()
nt.assert_items_equal(test._new_messages, ['1', '2', '3'],
msg=("_new_messages should be equal to "
"['1', '2', '3'], but is {} instead".format(
test._new_messages)))