[Bug 1817660] Re: test_terminal.TestTerminal tests fail when run a second time

[Steve Langasek]

A possible SRU regression has been reported against netplan.io
0.96-0ubuntu0.18.10.2 in LP: #1825206.  This version has been rolled
back to -proposed while the investigation is ongoing.

** Changed in: netplan.io (Ubuntu Cosmic)
       Status: Fix Released => Fix Committed

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https://bugs.launchpad.net/bugs/1817660

Title:
  test_terminal.TestTerminal tests fail when run a second time

Status in netplan:
  Fix Released
Status in netplan.io package in Ubuntu:
  Fix Released
Status in netplan.io source package in Bionic:
  Fix Committed
Status in netplan.io source package in Cosmic:
  Fix Committed

Bug description:
  [Impact]
  Limited to automatic testing run for netplan.

  [Test cases]
  1) Run 'make check' on netplan source twice.
  2) Verify the tests pass both times.

  [Regression potential]
  None.

  ---

  Several tests related setting terminal flags in
  test_terminal.TestTerminal fail when run a second time on the same
  terminal. They succeed the first time, then fail until you open a new
  terminal or SSH session.

  The cause appears to be that multiple tests such as test_save and
  test_save_and_restore_with_dict do not restore the terminal back to
  it's original clean state (O_NONBLOCK is left enabled) because the
  calls to .save() mean that .reset() restores back to that saved state.

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