tests: replace all "assert" by unittest assertions

If the assert fails because of a comparison, it is useful that the
test suite log contains a comparison of these values.
unittest.assertEqual() and friends do that for us.

* HACKING: Add a section about Python tests.
* tests/sanity/style.test: Forbid the use of "assert" in
Python tests.
* tests/python/298.py, tests/python/341.py, tests/python/471.py,
tests/python/accparse2.py, tests/python/aiger.py,
tests/python/aliases.py, tests/python/alternating.py,
tests/python/bdddict.py, tests/python/bdditer.py,
tests/python/bugdet.py, tests/python/complement_semidet.py,
tests/python/declenv.py, tests/python/decompose_scc.py,
tests/python/det.py, tests/python/dualize.py, tests/python/ecfalse.py,
tests/python/except.py, tests/python/game.py, tests/python/gen.py,
tests/python/genem.py, tests/python/implies.py,
tests/python/intrun.py, tests/python/kripke.py,
tests/python/langmap.py, tests/python/ltl2tgba.py,
tests/python/ltlf.py, tests/python/ltlparse.py,
tests/python/ltlsimple.py, tests/python/mealy.py,
tests/python/merge.py, tests/python/mergedge.py,
tests/python/misc-ec.py, tests/python/optionmap.py,
tests/python/origstate.py, tests/python/otfcrash.py,
tests/python/parity.py, tests/python/parsetgba.py,
tests/python/pdegen.py, tests/python/prodexpt.py,
tests/python/randgen.py, tests/python/relabel.py,
tests/python/remfin.py, tests/python/removeap.py,
tests/python/rs_like.py, tests/python/satmin.py,
tests/python/sbacc.py, tests/python/sccfilter.py,
tests/python/sccinfo.py, tests/python/sccsplit.py,
tests/python/semidet.py, tests/python/setacc.py,
tests/python/setxor.py, tests/python/simplacc.py,
tests/python/simstate.py, tests/python/sonf.py, tests/python/split.py,
tests/python/streett_totgba.py, tests/python/streett_totgba2.py,
tests/python/stutter.py, tests/python/sum.py,
tests/python/synthesis.py, tests/python/toparity.py,
tests/python/toweak.py, tests/python/tra2tba.py,
tests/python/trival.py, tests/python/twagraph.py,
tests/python/zlktree.py: Replace all occurrences of "assert" by calls
to unittest.TestCase methods.

tests/python/optionmap.py

@@ -1,6 +1,6 @@
 # -*- mode: python; coding: utf-8 -*-
-# Copyright (C) 2010, 2012, 2018 Laboratoire de Recherche et Développement
-# de l'EPITA.
+# Copyright (C) 2010, 2012, 2018, 2022 Laboratoire de Recherche et
+# Développement de l'EPITA.
 # Copyright (C) 2005  Laboratoire d'Informatique de Paris 6 (LIP6),
 # département Systèmes Répartis Coopératifs (SRC), Université Pierre
 # et Marie Curie.
@@ -21,65 +21,67 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import spot
+from unittest import TestCase
+tc = TestCase()
 
 o = spot.option_map()
 res = o.parse_options("optA, opta=2M, optb =4 ; optB =       7\
                        ,   optC=  10")
-assert not res
+tc.assertFalse(res)
 
-assert o.get('optA') == 1
-assert o.get('opta') == 2*1024*1024
-assert o.get('optb') == 4
-assert o.get('optB') == 7
-assert o.get('optC') == 10
-assert o.get('none') == 0
-assert o.get('none', 16) == 16
+tc.assertEqual(o.get('optA'), 1)
+tc.assertEqual(o.get('opta'), 2*1024*1024)
+tc.assertEqual(o.get('optb'), 4)
+tc.assertEqual(o.get('optB'), 7)
+tc.assertEqual(o.get('optC'), 10)
+tc.assertEqual(o.get('none'), 0)
+tc.assertEqual(o.get('none', 16), 16)
 
 o.set('optb', 40)
-assert o.get('optb') == 40
+tc.assertEqual(o.get('optb'), 40)
 
 res = o.parse_options("!optA !optb optC, !optB")
-assert not res
-assert o.get('optA') == 0
-assert o.get('opta') == 2*1024*1024
-assert o.get('optb') == 0
-assert o.get('optB') == 0
-assert o.get('optC') == 1
+tc.assertFalse(res)
+tc.assertEqual(o.get('optA'), 0)
+tc.assertEqual(o.get('opta'), 2*1024*1024)
+tc.assertEqual(o.get('optb'), 0)
+tc.assertEqual(o.get('optB'), 0)
+tc.assertEqual(o.get('optC'), 1)
 
 res = o.parse_options("!")
-assert res == "!"
+tc.assertEqual(res, "!")
 
 res = o.parse_options("foo, !opt = 1")
-assert res == "!opt = 1"
+tc.assertEqual(res, "!opt = 1")
 
 res = o.parse_options("foo=3, opt == 1")
-assert res == "opt == 1"
+tc.assertEqual(res, "opt == 1")
 
 res = o.parse_options("foo=3opt == 1")
-assert res == "3opt == 1"
+tc.assertEqual(res, "3opt == 1")
 
 aut1 = spot.translate('GF(a <-> XXa)', 'det')
-assert aut1.num_states() == 4
+tc.assertEqual(aut1.num_states(), 4)
 aut2 = spot.translate('GF(a <-> XXa)', 'det', xargs='gf-guarantee=0')
-assert aut2.num_states() == 9
+tc.assertEqual(aut2.num_states(), 9)
 
 try:
     spot.translate('GF(a <-> XXa)', 'det', xargs='foobar=1')
 except RuntimeError as e:
-    assert "option 'foobar' was not used" in str(e)
+    tc.assertIn("option 'foobar' was not used", str(e))
 else:
     raise RuntimeError("missing exception")
 
 try:
     spot.translate('GF(a <-> XXa)').postprocess('det', xargs='gf-guarantee=0')
 except RuntimeError as e:
-    assert "option 'gf-guarantee' was not used" in str(e)
+    tc.assertIn("option 'gf-guarantee' was not used", str(e))
 else:
     raise RuntimeError("missing exception")
 
 try:
     spot.translate('GF(a <-> XXa)').postprocess('det', xargs='gf-guarantee=x')
 except RuntimeError as e:
-    assert "failed to parse option at: 'gf-guarantee=x'" in str(e)
+    tc.assertIn("failed to parse option at: 'gf-guarantee=x'", str(e))
 else:
     raise RuntimeError("missing exception")