tests: Improve tests related to SAT-minimization

* tests/core/satmin.test: Delete check for SPOT_SATSOLVER env
variable and add state numbers verification.
* tests/core/satmin2.test: Delete check for SPOT_SATSOLVER
env variable.
* tests/python/satmin.py: Delete check for SPOT_SATSOLVER
env variable.

tests/core/satmin2.test

@@ -21,9 +21,6 @@
 . ./defs
 set -e
 
-# Skip if $SATSOLVE is not installed.
-(${SATSOLVER-glucose} --help >/dev/null 2>&1) || exit 77
-
 autfilt=autfilt
 ltlfilt=ltlfilt
 
@@ -152,8 +149,8 @@ properties: trans-labels explicit-labels trans-acc colored complete
 properties: deterministic
 --BODY--
 State: 0
-[0] 0 {0}
-[!0] 0 {1}
+[!0] 0 {0}
+[0] 0 {1}
 --END--
 EOF
 

tests/python/satmin.py

@@ -17,13 +17,8 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-import shutil
-import sys
 import spot
 
-# Ignore the test if glucose is not installed.
-if shutil.which("glucose") == None:
-    sys.exit(77)
 
 aut = spot.translate('GFa & GFb', 'BA')
 assert aut.num_sets() == 1