more coverage

* python/spot/impl.i: Add missing bindings from remprop.hh
* tests/python/except.py: New file to test several error cases.
* tests/Makefile.am: Add it.
* spot/twaalgos/rabin2parity.cc (iar): Fix error message.

python/spot/impl.i

@@ -138,6 +138,7 @@
 #include <spot/twaalgos/neverclaim.hh>
 #include <spot/twaalgos/randomize.hh>
 #include <spot/twaalgos/remfin.hh>
+#include <spot/twaalgos/remprop.hh>
 #include <spot/twaalgos/totgba.hh>
 #include <spot/twaalgos/sbacc.hh>
 #include <spot/twaalgos/sccinfo.hh>
@@ -579,6 +580,7 @@ def state_is_accepting(self, src) -> "bool":
 %include <spot/twaalgos/neverclaim.hh>
 %include <spot/twaalgos/randomize.hh>
 %include <spot/twaalgos/remfin.hh>
+%include <spot/twaalgos/remprop.hh>
 %include <spot/twaalgos/totgba.hh>
 %include <spot/twaalgos/sbacc.hh>
 %traits_swigtype(spot::scc_info_node);

spot/twaalgos/rabin2parity.cc

@@ -282,12 +282,8 @@ namespace spot
   twa_graph_ptr
   iar(const const_twa_graph_ptr& aut)
   {
-    auto res = iar_maybe(aut);
+    if (auto res = iar_maybe(aut))
-    if (!res)
+      return res;
-      throw std::runtime_error("rabin2parity works only for Rabin-like "
+    throw std::runtime_error("iar() expects Rabin-like input");
-          "automata");
-
-    return res;
   }
 }
-

tests/Makefile.am

@@ -361,6 +361,7 @@ TESTS_python = \
   python/declenv.py \
   python/decompose_scc.py \
   python/dualize.py \
+  python/except.py \
   python/gen.py \
   python/implies.py \
   python/interdep.py \

tests/python/except.py

@@ -0,0 +1,61 @@
+# -*- mode: python; coding: utf-8 -*-
+# Copyright (C) 2018 Laboratoire de Recherche et Développement de
+# l'Epita (LRDE).
+#
+# This file is part of Spot, a model checking library.
+#
+# Spot is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# Spot is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+# License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+# Test some function that must return exceptions on error.  Doing
+# so is mostly a way to improve the coverage report.
+
+
+import spot
+
+try:
+    spot.iar(spot.translate('GFa & GFb & GFc'))
+except RuntimeError as e:
+    assert 'iar() expects Rabin-like input' in str(e)
+
+alt = spot.dualize(spot.translate('FGa | FGb'))
+
+try:
+    spot.tgba_determinize(alt)
+except RuntimeError as e:
+    assert 'tgba_determinize() does not support alternation' in str(e)
+
+
+aut = spot.translate('a U b U c')
+aps = aut.ap()
+rem = spot.remove_ap()
+rem.add_ap('"a"=0,b')
+aut = rem.strip(aut)
+assert aut.ap() == aps[2:]
+try:
+    rem.add_ap('"a=0,b')
+except ValueError as e:
+    assert """missing closing '"'""" in str(e)
+
+try:
+    rem.add_ap('a=0=b')
+except ValueError as e:
+    assert """unexpected '=' at position 3""" in str(e)
+
+
+si = spot.scc_info(alt)
+try:
+    si.determine_unknown_acceptance()
+except RuntimeError as e:
+    assert "scc_info::determine_unknown_acceptance() does not supp" in str(e)