diff --git a/python/spot/impl.i b/python/spot/impl.i
index 2df9f8f530274d93e9061bacbae39e69e8dfd082..9667aed9d4408d135dbe5a6410cbc1a958247903 100644
--- a/python/spot/impl.i
+++ b/python/spot/impl.i
@@ -87,6 +87,7 @@
 #include <spot/tl/formula.hh>
 
 #include <spot/tl/environment.hh>
+#include <spot/tl/declenv.hh>
 #include <spot/tl/defaultenv.hh>
 
 #include <spot/tl/parse.hh>
@@ -425,6 +426,7 @@ namespace std {
 }
 
 %include <spot/tl/environment.hh>
+%include <spot/tl/declenv.hh>
 %include <spot/tl/defaultenv.hh>
 
 %include <spot/tl/parse.hh>
diff --git a/tests/Makefile.am b/tests/Makefile.am
index c1b37ddebeff69ccd6fbf3186fbe7d9ba6e18046..aedabe53d06ce9ab76983614dc9358732acc5773 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -322,15 +322,15 @@ TESTS_ipython = \
 # do not consider part of the documentation: those have to start
 # with a _.
 TESTS_python = \
-  python/_aux.ipynb \
   python/_altscc.ipynb \
+  python/_aux.ipynb \
   python/accparse2.py \
   python/alarm.py \
   python/alternating.py \
-  python/bddnqueen.py \
   python/bdditer.py \
+  python/bddnqueen.py \
   python/bugdet.py \
-  python/sccinfo.py \
+  python/declenv.py \
   python/decompose_scc.py \
   python/implies.py \
   python/interdep.py \
@@ -347,8 +347,9 @@ TESTS_python = \
   python/relabel.py \
   python/remfin.py \
   python/satmin.py \
-  python/setacc.py \
   python/sccfilter.py \
+  python/sccinfo.py \
+  python/setacc.py \
   python/setxor.py \
   python/sum.py \
   python/trival.py \
diff --git a/tests/python/declenv.py b/tests/python/declenv.py
new file mode 100644
index 0000000000000000000000000000000000000000..647f4d5e1a55140cc881a8fa4793bee9a0346872
--- /dev/null
+++ b/tests/python/declenv.py
@@ -0,0 +1,71 @@
+# -*- mode: python; coding: utf-8 -*-
+# Copyright (C) 2017 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/>.
+
+
+# This file tests various error conditions on the twa API
+
+import spot
+
+env = spot.declarative_environment()
+env.declare("a")
+env.declare("b")
+
+f1a = spot.parse_infix_psl("a U b")
+f1b = spot.parse_infix_psl("a U b", env)
+assert not f1a.errors
+assert not f1b.errors
+# In the past, atomic propositions requires via different environments were
+# never equal, but this feature was never used and we changed that in Spot 2.0
+# for the sake of simplicity.
+assert f1a.f == f1b.f
+
+f2 = spot.parse_infix_psl("(a U b) U c", env)
+assert f2.errors
+ostr = spot.ostringstream()
+f2.format_errors(ostr)
+err = ostr.str()
+assert "unknown atomic proposition `c'" in err
+
+f3 = spot.parse_prefix_ltl("R a d", env)
+assert f3.errors
+ostr = spot.ostringstream()
+f3.format_errors(ostr)
+err = ostr.str()
+assert "unknown atomic proposition `d'" in err
+
+f4 = spot.parse_prefix_ltl("R a b", env)
+assert not f4.errors
+
+for (x, op) in [('a* <-> b*', "`<->'"),
+                ('a* -> b', "`->'"),
+                ('a ^ b*', "`^'"),
+                ('!(b*)', "`!'"),
+                ('a*[=2]', "[=...]"),
+                ('a*[->2]', "[->...]")]:
+    f5 = spot.parse_infix_sere(x)
+    assert f5.errors
+    ostr = spot.ostringstream()
+    f5.format_errors(ostr)
+    err = ostr.str()
+    assert "not a Boolean expression" in err
+    assert op in err
+    assert "SERE" in err
+
+f6 = spot.parse_infix_sere('(a <-> b -> c ^ b)[=2] & c[->2]')
+assert not f6.errors