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
dmesg = LinuxDmesg()
dmesg.DMESG_COMMAND = ['echo', 'a\nb\nc\n']
dmesg.update_dmesg()
# Update the DMESG_COMMAND to add d\n and remove a\n, this simluates the
# wrap
dmesg.DMESG_COMMAND = ['echo', 'b\nc\nd\n']
dmesg.update_dmesg()
nt.assert_items_equal(dmesg._new_messages, ['d'],
msg="_new_messages should be equal to ['d'], but is "
"{} instead.".format(dmesg._new_messages))
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
dmesg = LinuxDmesg()
dmesg.DMESG_COMMAND = ['echo', 'a\nb\nc\n']
dmesg.update_dmesg()
# Update the DMESG_COMMAND to add d\n and remove a\n, this simluates the
# wrap
dmesg.DMESG_COMMAND = ['echo', 'b\nc\nd\n']
dmesg.update_dmesg()
nt.assert_items_equal(dmesg._new_messages, ['d'],
msg="_new_messages should be equal to ['d'], but is "
"{} instead.".format(dmesg._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
dmesg = LinuxDmesg()
dmesg.DMESG_COMMAND = ['echo', 'a\nb\nc\n']
dmesg.update_dmesg()
# Udamte the DMESG_COMMAND to add d\n and remove a\n, this simluates the
# wrap
dmesg.DMESG_COMMAND = ['echo', '1\n2\n3\n']
dmesg.update_dmesg()
nt.assert_items_equal(dmesg._new_messages, ['1', '2', '3'],
msg="_new_messages should be equal to "
"['1', '2', '3'], but is {} instead".format(
dmesg._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
dmesg = LinuxDmesg()
dmesg.DMESG_COMMAND = ['echo', 'a\nb\nc\n']
dmesg.update_dmesg()
# Udamte the DMESG_COMMAND to add d\n and remove a\n, this simluates the
# wrap
dmesg.DMESG_COMMAND = ['echo', '1\n2\n3\n']
dmesg.update_dmesg()
nt.assert_items_equal(dmesg._new_messages, ['1', '2', '3'],
msg="_new_messages should be equal to "
"['1', '2', '3'], but is {} instead".format(
dmesg._new_messages))
