fix two issues related to jupyter notebook execution

* tests/python/ipnbdoctest.py: Invert diffs inputs.
* tests/run.in: Run notebooks with
PYTHONIOENCODING=utf-8:surrogateescape to avoid exceptions when trying
to display utf-8 characters on ascii terminals.

tests/python/ipnbdoctest.py

@@ -278,7 +278,7 @@ def test_notebook(ipynb):
             print("output length mismatch (expected {}, got {})".format(
                   len(cell.outputs), len(outs)))
             failed = True
-        if not compare_outputs(outs, cell.outputs):
+        if not compare_outputs(cell.outputs, outs):
             failed = True
         print("cell %d: " % i, end="")
         if failed:

tests/run.in

 #!/bin/sh
 # -*- coding: utf-8 -*-
-# Copyright (C) 2010, 2011, 2014, 2015, 2016 Laboratoire de Recherche et
-# Developpement de l'EPITA (LRDE).
+# Copyright (C) 2010, 2011, 2014-2016, 2018 Laboratoire de Recherche
+# et Developpement de l'EPITA (LRDE).
 # Copyright (C) 2003, 2004 Laboratoire d'Informatique de Paris 6
 # (LIP6), département Systèmes Répartis Coopératifs (SRC), Université
 # Pierre et Marie Curie.
@@ -92,6 +92,7 @@ export srcdir
 case $1 in
   *.ipynb)
     PYTHONPATH=$pypath DYLD_LIBRARY_PATH=$modpath \
+    PYTHONIOENCODING=utf-8:surrogateescape \
     exec $PREFIXCMD @PYTHON@ @abs_srcdir@/python/ipnbdoctest.py "$@";;
   *.py)
     PYTHONPATH=$pypath DYLD_LIBRARY_PATH=$modpath \