comparison tests/test-extension.t @ 41522:b0865b5919c6

py3: account for demand import difference between Python versions

Our lazy importer for Python 3 will validate that modules are
loadable before returning a stub module object. This is different
from Python 2, which will always return a stub module object.

While we could change behavior of the Python 3 demand importer,
that seems like a problem for another day.

This commit teaches test-extension.t about that difference in
behavior.

Differential Revision: https://phab.mercurial-scm.org/D5798

41521:30248d6bc057

  $ cat > $TESTTMP/checkrelativity.py <<NO_CHECK_EOF
  > from mercurial import registrar
  > cmdtable = {}
  > command = registrar.command(cmdtable)
  > 
  > # demand import avoids failure of importing notexist here
  > import extlibroot.lsub1.lsub2.notexist
  > 
  > @command(b'checkrelativity', [], norepo=True)
  > def checkrelativity(ui, *args, **opts):
  >     try:

  >         return 1 # unintentional success
  >     except ImportError:
  >         pass # intentional failure
  > NO_CHECK_EOF

  $ (PYTHONPATH=${PYTHONPATH}${PATHSEP}${TESTTMP}; hg --config extensions.checkrelativity=$TESTTMP/checkrelativity.py checkrelativity)

#endif

(Here, module importing tests are finished. Therefore, use other than
NO_CHECK_* limit mark for heredoc python files, in order to apply

41522:b0865b5919c6

  $ cat > $TESTTMP/checkrelativity.py <<NO_CHECK_EOF
  > from mercurial import registrar
  > cmdtable = {}
  > command = registrar.command(cmdtable)
  > 
  > # demand import avoids failure of importing notexist here, but only on
  > # Python 2.
  > import extlibroot.lsub1.lsub2.notexist
  > 
  > @command(b'checkrelativity', [], norepo=True)
  > def checkrelativity(ui, *args, **opts):
  >     try:

  >         return 1 # unintentional success
  >     except ImportError:
  >         pass # intentional failure
  > NO_CHECK_EOF

Python 3's lazy importer verifies modules exist before returning the lazy
module stub. Our custom lazy importer for Python 2 always returns a stub.

  $ (PYTHONPATH=${PYTHONPATH}${PATHSEP}${TESTTMP}; hg --config extensions.checkrelativity=$TESTTMP/checkrelativity.py checkrelativity) || true
  *** failed to import extension checkrelativity from $TESTTMP/checkrelativity.py: No module named 'extlibroot.lsub1.lsub2.notexist' (py3 !)
  hg: unknown command 'checkrelativity' (py3 !)
  (use 'hg help' for a list of commands) (py3 !)

#endif

(Here, module importing tests are finished. Therefore, use other than
NO_CHECK_* limit mark for heredoc python files, in order to apply