sat_minimize: do not complete in the preproc step

Fixes #204.

* spot/twaalgos/dtwasat.cc (sat_minimize): Here.
* tests/core/satmin2.test: Add a test case.
* NEWS: Mention the bug.

NEWS

@@ -155,6 +155,10 @@ Bugs fixed:
     input (%s) it would not automatically relabel any unsupported
     atomic propositions as ltldo already do.
 
+  * When running "autfilt --sat-minimize" on a automaton representing
+    an obligation property, the result would always be a complete
+    automaton even without the -C option.
+
 New in spot 2.2.2 (2016-12-16)
 
   Build:

spot/twaalgos/dtwasat.cc

 // -*- coding: utf-8 -*-
-// Copyright (C) 2013, 2014, 2015, 2016 Laboratoire de Recherche et
-// Développement de l'Epita.
+// Copyright (C) 2013, 2014, 2015, 2016, 2017 Laboratoire de Recherche
+// et Développement de l'Epita.
 //
 // This file is part of Spot, a model checking library.
 //
@@ -1446,9 +1446,7 @@ namespace spot
         postprocessor post;
         auto sba = (state_based && a->prop_state_acc()) ?
           postprocessor::SBAcc : postprocessor::Any;
-        post.set_pref(postprocessor::Deterministic
-                      | postprocessor::Complete
-                      | sba);
+        post.set_pref(postprocessor::Deterministic | sba);
         post.set_type(postprocessor::Generic);
         postprocessor::optimization_level level;
         switch (preproc)
@@ -1477,10 +1475,10 @@ namespace spot
             && (target_is_buchi || !user_supplied_acc))
           return a;
       }
-    else
-      {
-        complete_here(a);
-      }
+    // We always complete ourself, and do not ask the above call to
+    // postprocessor to do it, because that extra state would be
+    // returned in the case of a WDBA.
+    complete_here(a);
 
     if (states == -1 && max_states == -1)
       {

tests/core/satmin2.test

 #!/bin/sh
 # -*- coding: utf-8 -*-
-# Copyright (C) 2013, 2015 Laboratoire de Recherche et Développement
+# Copyright (C) 2013, 2015, 2017 Laboratoire de Recherche et Développement
 # de l'Epita (LRDE).
 #
 # This file is part of Spot, a model checking library.
@@ -21,9 +21,6 @@
 . ./defs
 set -e
 
-autfilt=autfilt
-ltlfilt=ltlfilt
-
 # This is a counterexample for one of the optimization idea we had for
 # the SAT-based minimization.
 cat >input.hoa  <<EOF
@@ -132,84 +129,84 @@ EOF
 # easily really check the expected automaton, because different SAT
 # solver (even different versions of glucose) can return different
 # automata.
-$autfilt --sat-minimize='acc="Fin(0)|Inf(1)"' test.hoa --stats=%s >output
+autfilt --sat-minimize='acc="Fin(0)|Inf(1)"' test.hoa --stats=%s >output
 test `cat output` = 1
-$autfilt --sat-minimize='sat-langmap,acc="Fin(0)|Inf(1)"' test.hoa --stats=%s \
+autfilt --sat-minimize='sat-langmap,acc="Fin(0)|Inf(1)"' test.hoa --stats=%s \
   >output
 test `cat output` = 1
-$autfilt --sat-minimize='acc="Fin(0)|Inf(1)",sat-incr=1,sat-incr-steps=0' \
+autfilt --sat-minimize='acc="Fin(0)|Inf(1)",sat-incr=1,sat-incr-steps=0' \
   test.hoa --stats=%s >output
 test `cat output` = 1
-$autfilt --sat-minimize='acc="Fin(0)|Inf(1)",sat-incr=1,sat-incr-steps=1' \
+autfilt --sat-minimize='acc="Fin(0)|Inf(1)",sat-incr=1,sat-incr-steps=1' \
   test.hoa --stats=%s >output
 test `cat output` = 1
-$autfilt --sat-minimize='acc="Fin(0)|Inf(1)",sat-incr=1,sat-incr-steps=2' \
+autfilt --sat-minimize='acc="Fin(0)|Inf(1)",sat-incr=1,sat-incr-steps=2' \
   test.hoa --stats=%s >output
 test `cat output` = 1
-$autfilt --sat-minimize='acc="Fin(0)|Inf(1)",sat-incr=1,sat-incr-steps=50' \
+autfilt --sat-minimize='acc="Fin(0)|Inf(1)",sat-incr=1,sat-incr-steps=50' \
   test.hoa --stats=%s >output
 test `cat output` = 1
-$autfilt --sat-minimize='acc="Fin(0)|Inf(1)"sat-incr=2,sat-incr-steps=-1' \
+autfilt --sat-minimize='acc="Fin(0)|Inf(1)"sat-incr=2,sat-incr-steps=-1' \
   test.hoa --stats=%s >output
 test `cat output` = 1
-$autfilt --sat-minimize='acc="Fin(0)|Inf(1)"sat-incr=2,sat-incr-steps=0' \
+autfilt --sat-minimize='acc="Fin(0)|Inf(1)"sat-incr=2,sat-incr-steps=0' \
   test.hoa --stats=%s >output
 test `cat output` = 1
-$autfilt --sat-minimize='acc="Fin(0)|Inf(1)"sat-incr=2,sat-incr-steps=1' \
+autfilt --sat-minimize='acc="Fin(0)|Inf(1)"sat-incr=2,sat-incr-steps=1' \
   test.hoa --stats=%s >output
 test `cat output` = 1
-$autfilt --sat-minimize='acc="Fin(0)|Inf(1)"sat-incr=2,sat-incr-steps=2' \
+autfilt --sat-minimize='acc="Fin(0)|Inf(1)"sat-incr=2,sat-incr-steps=2' \
   test.hoa --stats=%s >output
 test `cat output` = 1
-$autfilt --sat-minimize='acc="Fin(0)|Inf(1)"sat-incr=2,sat-incr-steps=50' \
+autfilt --sat-minimize='acc="Fin(0)|Inf(1)"sat-incr=2,sat-incr-steps=50' \
   test.hoa --stats=%s >output
 test `cat output` = 1
-$autfilt --sat-minimize='sat-naive,acc="Fin(0)|Inf(1)"' test.hoa \
+autfilt --sat-minimize='sat-naive,acc="Fin(0)|Inf(1)"' test.hoa \
   --stats=%s >output
 test `cat output` = 1
 
 
 # How about a state-based DSA ?
-$autfilt -S --sat-minimize='acc="Fin(0)|Inf(1)"' test.hoa \
+autfilt -S --sat-minimize='acc="Fin(0)|Inf(1)"' test.hoa \
   --stats=%s > output
 test `cat output` = 3
-$autfilt -S --sat-minimize='sat-langmap,acc="Fin(0)|Inf(1)"' test.hoa \
+autfilt -S --sat-minimize='sat-langmap,acc="Fin(0)|Inf(1)"' test.hoa \
   --stats=%s > output
 test `cat output` = 3
-$autfilt --sat-minimize='acc="Fin(0)|Inf(1)",sat-incr=1,sat-incr-steps=0' \
+autfilt --sat-minimize='acc="Fin(0)|Inf(1)",sat-incr=1,sat-incr-steps=0' \
   test.hoa --stats=%s >output
 test `cat output` = 1
-$autfilt --sat-minimize='acc="Fin(0)|Inf(1)",sat-incr=1,sat-incr-steps=1' \
+autfilt --sat-minimize='acc="Fin(0)|Inf(1)",sat-incr=1,sat-incr-steps=1' \
   test.hoa --stats=%s >output
 test `cat output` = 1
-$autfilt --sat-minimize='acc="Fin(0)|Inf(1)",sat-incr=1,sat-incr-steps=2' \
+autfilt --sat-minimize='acc="Fin(0)|Inf(1)",sat-incr=1,sat-incr-steps=2' \
   test.hoa --stats=%s >output
 test `cat output` = 1
-$autfilt --sat-minimize='acc="Fin(0)|Inf(1)",sat-incr=1,sat-incr-steps=50' \
+autfilt --sat-minimize='acc="Fin(0)|Inf(1)",sat-incr=1,sat-incr-steps=50' \
   test.hoa --stats=%s >output
 test `cat output` = 1
-$autfilt --sat-minimize='acc="Fin(0)|Inf(1)"sat-incr=2,sat-incr-steps=-1' \
+autfilt --sat-minimize='acc="Fin(0)|Inf(1)"sat-incr=2,sat-incr-steps=-1' \
   test.hoa --stats=%s >output
 test `cat output` = 1
-$autfilt --sat-minimize='acc="Fin(0)|Inf(1)"sat-incr=2,sat-incr-steps=0' \
+autfilt --sat-minimize='acc="Fin(0)|Inf(1)"sat-incr=2,sat-incr-steps=0' \
   test.hoa --stats=%s >output
 test `cat output` = 1
-$autfilt --sat-minimize='acc="Fin(0)|Inf(1)"sat-incr=2,sat-incr-steps=1' \
+autfilt --sat-minimize='acc="Fin(0)|Inf(1)"sat-incr=2,sat-incr-steps=1' \
   test.hoa --stats=%s >output
 test `cat output` = 1
-$autfilt --sat-minimize='acc="Fin(0)|Inf(1)"sat-incr=2,sat-incr-steps=2' \
+autfilt --sat-minimize='acc="Fin(0)|Inf(1)"sat-incr=2,sat-incr-steps=2' \
   test.hoa --stats=%s >output
 test `cat output` = 1
-$autfilt --sat-minimize='acc="Fin(0)|Inf(1)"sat-incr=2,sat-incr-steps=50' \
+autfilt --sat-minimize='acc="Fin(0)|Inf(1)"sat-incr=2,sat-incr-steps=50' \
   test.hoa --stats=%s >output
 test `cat output` = 1
-$autfilt --sat-minimize='acc="Fin(0)|Inf(1)",sat-naive' test.hoa \
+autfilt --sat-minimize='acc="Fin(0)|Inf(1)",sat-naive' test.hoa \
   --stats=%s >output
 test `cat output` = 1
 
 
 # How about a state-based DPA?
-$autfilt -S --sat-minimize='acc="parity max even 3",colored' -H test.hoa \
+autfilt -S --sat-minimize='acc="parity max even 3",colored' -H test.hoa \
 	 > output
 cat output
 grep 'properties:.*colored' output
@@ -217,7 +214,7 @@ grep 'States: 3' output
 grep 'acc-name: parity max even 3' output
 grep 'Acceptance: 3 Inf(2) | (Fin(1) & Inf(0))' output
 test 3 = `grep -c 'State: [012] {[012]}' output`
-$autfilt -S --sat-minimize='acc="parity max even 3",colored,sat-langmap' -H \
+autfilt -S --sat-minimize='acc="parity max even 3",colored,sat-langmap' -H \
   test.hoa > output
 cat output
 grep 'properties:.*colored' output
@@ -225,7 +222,7 @@ grep 'States: 3' output
 grep 'acc-name: parity max even 3' output
 grep 'Acceptance: 3 Inf(2) | (Fin(1) & Inf(0))' output
 test 3 = `grep -c 'State: [012] {[012]}' output`
-$autfilt -S \
+autfilt -S \
   --sat-minimize='acc="parity max even 3",colored,sat-incr=1,sat-incr-steps=0' \
   -H test.hoa > output
 cat output
@@ -234,7 +231,7 @@ grep 'States: 3' output
 grep 'acc-name: parity max even 3' output
 grep 'Acceptance: 3 Inf(2) | (Fin(1) & Inf(0))' output
 test 3 = `grep -c 'State: [012] {[012]}' output`
-$autfilt -S \
+autfilt -S \
   --sat-minimize='acc="parity max even 3",colored,sat-incr=1,sat-incr-steps=1' \
   -H test.hoa > output
 cat output
@@ -243,7 +240,7 @@ grep 'States: 3' output
 grep 'acc-name: parity max even 3' output
 grep 'Acceptance: 3 Inf(2) | (Fin(1) & Inf(0))' output
 test 3 = `grep -c 'State: [012] {[012]}' output`
-$autfilt -S \
+autfilt -S \
   --sat-minimize='acc="parity max even 3",colored,sat-incr=1,sat-incr-steps=2' \
   -H test.hoa > output
 cat output
@@ -252,7 +249,7 @@ grep 'States: 3' output
 grep 'acc-name: parity max even 3' output
 grep 'Acceptance: 3 Inf(2) | (Fin(1) & Inf(0))' output
 test 3 = `grep -c 'State: [012] {[012]}' output`
-$autfilt -S \
+autfilt -S \
   --sat-minimize='acc="parity max even 3",colored,sat-incr=1,sat-incr-steps=50'\
    -H test.hoa > output
 cat output
@@ -261,7 +258,7 @@ grep 'States: 3' output
 grep 'acc-name: parity max even 3' output
 grep 'Acceptance: 3 Inf(2) | (Fin(1) & Inf(0))' output
 test 3 = `grep -c 'State: [012] {[012]}' output`
-$autfilt -S \
+autfilt -S \
   --sat-minimize='acc="parity max even 3",colored,sat-incr=2,sat-incr-steps=-1'\
    -H test.hoa > output
 cat output
@@ -270,7 +267,7 @@ grep 'States: 3' output
 grep 'acc-name: parity max even 3' output
 grep 'Acceptance: 3 Inf(2) | (Fin(1) & Inf(0))' output
 test 3 = `grep -c 'State: [012] {[012]}' output`
-$autfilt -S \
+autfilt -S \
   --sat-minimize='acc="parity max even 3",colored,sat-incr=2,sat-incr-steps=0' \
   -H test.hoa > output
 cat output
@@ -279,7 +276,7 @@ grep 'States: 3' output
 grep 'acc-name: parity max even 3' output
 grep 'Acceptance: 3 Inf(2) | (Fin(1) & Inf(0))' output
 test 3 = `grep -c 'State: [012] {[012]}' output`
-$autfilt -S \
+autfilt -S \
   --sat-minimize='acc="parity max even 3",colored,sat-incr=2,sat-incr-steps=1' \
   -H test.hoa > output
 cat output
@@ -288,7 +285,7 @@ grep 'States: 3' output
 grep 'acc-name: parity max even 3' output
 grep 'Acceptance: 3 Inf(2) | (Fin(1) & Inf(0))' output
 test 3 = `grep -c 'State: [012] {[012]}' output`
-$autfilt -S \
+autfilt -S \
   --sat-minimize='acc="parity max even 3",colored,sat-incr=2,sat-incr-steps=2' \
   -H test.hoa > output
 cat output
@@ -297,7 +294,7 @@ grep 'States: 3' output
 grep 'acc-name: parity max even 3' output
 grep 'Acceptance: 3 Inf(2) | (Fin(1) & Inf(0))' output
 test 3 = `grep -c 'State: [012] {[012]}' output`
-$autfilt -S \
+autfilt -S \
   --sat-minimize='acc="parity max even 3",colored,sat-incr=2,sat-incr-steps=50'\
    -H test.hoa > output
 cat output
@@ -306,7 +303,7 @@ grep 'States: 3' output
 grep 'acc-name: parity max even 3' output
 grep 'Acceptance: 3 Inf(2) | (Fin(1) & Inf(0))' output
 test 3 = `grep -c 'State: [012] {[012]}' output`
-$autfilt -S --sat-minimize='acc="parity max even 3",colored,sat-naive' \
+autfilt -S --sat-minimize='acc="parity max even 3",colored,sat-naive' \
   -H test.hoa > output
 cat output
 grep 'properties:.*colored' output
@@ -347,29 +344,29 @@ State: 0
 [!0] 0 {1}
 --END--
 EOF
-$autfilt -H --sat-minimize special.hoa > output
+autfilt -H --sat-minimize special.hoa > output
 diff output expected
-$autfilt -H --sat-minimize='sat-langmap' special.hoa > output
+autfilt -H --sat-minimize='sat-langmap' special.hoa > output
 diff output expected
-$autfilt -H --sat-minimize='sat-incr=1,sat-incr-steps=0' special.hoa > output
+autfilt -H --sat-minimize='sat-incr=1,sat-incr-steps=0' special.hoa > output
 diff output expected
-$autfilt -H --sat-minimize='sat-incr=1,sat-incr-steps=1' special.hoa > output
+autfilt -H --sat-minimize='sat-incr=1,sat-incr-steps=1' special.hoa > output
 diff output expected
-$autfilt -H --sat-minimize='sat-incr=1,sat-incr-steps=2' special.hoa > output
+autfilt -H --sat-minimize='sat-incr=1,sat-incr-steps=2' special.hoa > output
 diff output expected
-$autfilt -H --sat-minimize='sat-incr=1,sat-incr-steps=50' special.hoa > output
+autfilt -H --sat-minimize='sat-incr=1,sat-incr-steps=50' special.hoa > output
 diff output expected
-$autfilt -H --sat-minimize='sat-incr=2,sat-incr-steps=-1' special.hoa > output
+autfilt -H --sat-minimize='sat-incr=2,sat-incr-steps=-1' special.hoa > output
 diff output expected
-$autfilt -H --sat-minimize='sat-incr=2,sat-incr-steps=0' special.hoa > output
+autfilt -H --sat-minimize='sat-incr=2,sat-incr-steps=0' special.hoa > output
 diff output expected
-$autfilt -H --sat-minimize='sat-incr=2,sat-incr-steps=1' special.hoa > output
+autfilt -H --sat-minimize='sat-incr=2,sat-incr-steps=1' special.hoa > output
 diff output expected
-$autfilt -H --sat-minimize='sat-incr=2,sat-incr-steps=2' special.hoa > output
+autfilt -H --sat-minimize='sat-incr=2,sat-incr-steps=2' special.hoa > output
 diff output expected
-$autfilt -H --sat-minimize='sat-incr=2,sat-incr-steps=50' special.hoa > output
+autfilt -H --sat-minimize='sat-incr=2,sat-incr-steps=50' special.hoa > output
 diff output expected
-$autfilt -H --sat-minimize='sat-naive' special.hoa > output
+autfilt -H --sat-minimize='sat-naive' special.hoa > output
 diff output expected
 
 
@@ -387,136 +384,139 @@ State: 0
  0 {2 1}        /*{b, a}*/
 --END--
 EOF
-$autfilt --sat-minimize='acc="Streett 1",max-states=2' foo.hoa \
+autfilt --sat-minimize='acc="Streett 1",max-states=2' foo.hoa \
 	 --stats=%s >out
 test "`cat out`" = 1
-$autfilt --sat-minimize='acc="Streett 1",max-states=2,sat-langmap' foo.hoa \
+autfilt --sat-minimize='acc="Streett 1",max-states=2,sat-langmap' foo.hoa \
 	 --stats=%s >out
 test "`cat out`" = 1
-$autfilt \
+autfilt \
   --sat-minimize='acc="Streett 1",max-states=2,sat-incr=1,sat-incr-steps=0' \
   foo.hoa --stats=%s >out
 test "`cat out`" = 1
-$autfilt \
+autfilt \
   --sat-minimize='acc="Streett 1",max-states=2,sat-incr=1,sat-incr-steps=1' \
   foo.hoa --stats=%s >out
 test "`cat out`" = 1
-$autfilt \
+autfilt \
   --sat-minimize='acc="Streett 1",max-states=2,sat-incr=1,sat-incr-steps=2' \
   foo.hoa --stats=%s >out
 test "`cat out`" = 1
-$autfilt \
+autfilt \
   --sat-minimize='acc="Streett 1",max-states=2,sat-incr=1,sat-incr-steps=50' \
   foo.hoa --stats=%s >out
 test "`cat out`" = 1
-$autfilt \
+autfilt \
   --sat-minimize='acc="Streett 1",max-states=2,sat-incr=2,sat-incr-steps=-1' \
   foo.hoa --stats=%s >out
 test "`cat out`" = 1
-$autfilt \
+autfilt \
   --sat-minimize='acc="Streett 1",max-states=2,sat-incr=2,sat-incr-steps=0' \
   foo.hoa --stats=%s >out
 test "`cat out`" = 1
-$autfilt \
+autfilt \
   --sat-minimize='acc="Streett 1",max-states=2,sat-incr=2,sat-incr-steps=1' \
   foo.hoa --stats=%s >out
 test "`cat out`" = 1
-$autfilt \
+autfilt \
   --sat-minimize='acc="Streett 1",max-states=2,sat-incr=2,sat-incr-steps=2' \
   foo.hoa --stats=%s >out
 test "`cat out`" = 1
-$autfilt \
+autfilt \
   --sat-minimize='acc="Streett 1",max-states=2,sat-incr=2,sat-incr-steps=50' \
   foo.hoa --stats=%s >out
 test "`cat out`" = 1
-$autfilt --sat-minimize='acc="Streett 1",max-states=2,sat-naive' foo.hoa \
+autfilt --sat-minimize='acc="Streett 1",max-states=2,sat-naive' foo.hoa \
 	 --stats=%s >out
 test "`cat out`" = 1
 
 
-$autfilt --sat-minimize='acc="Rabin 1",max-states=4' foo.hoa \
+autfilt --sat-minimize='acc="Rabin 1",max-states=4' foo.hoa \
 	 --stats=%s >out && exit 1
 test -z "`cat out`"
-$autfilt --sat-minimize='acc="Rabin 1",max-states=4,sat-langmap' foo.hoa \
+autfilt --sat-minimize='acc="Rabin 1",max-states=4,sat-langmap' foo.hoa \
 	 --stats=%s >out && exit 1
 test -z "`cat out`"
-$autfilt \
+autfilt \
   --sat-minimize='acc="Rabin 1",max-states=4,sat-incr=1,sat-incr-steps=0' \
   foo.hoa --stats=%s >out && exit 1
 test -z "`cat out`"
-$autfilt \
+autfilt \
   --sat-minimize='acc="Rabin 1",max-states=4,sat-incr=1,sat-incr-steps=1' \
   foo.hoa --stats=%s >out && exit 1
 test -z "`cat out`"
-$autfilt \
+autfilt \
   --sat-minimize='acc="Rabin 1",max-states=4,sat-incr=1,sat-incr-steps=2' \
   foo.hoa --stats=%s >out && exit 1
 test -z "`cat out`"
-$autfilt \
+autfilt \
   --sat-minimize='acc="Rabin 1",max-states=4,sat-incr=1,sat-incr-steps=50' \
   foo.hoa --stats=%s >out && exit 1
 test -z "`cat out`"
-$autfilt \
+autfilt \
   --sat-minimize='acc="Rabin 1",max-states=4sat-incr=2,sat-incr-steps=-1' \
   foo.hoa --stats=%s >out && exit 1
 test -z "`cat out`"
-$autfilt \
+autfilt \
   --sat-minimize='acc="Rabin 1",max-states=4sat-incr=2,sat-incr-steps=0' \
   foo.hoa --stats=%s >out && exit 1
 test -z "`cat out`"
-$autfilt \
+autfilt \
   --sat-minimize='acc="Rabin 1",max-states=4sat-incr=2,sat-incr-steps=1' \
   foo.hoa --stats=%s >out && exit 1
 test -z "`cat out`"
-$autfilt \
+autfilt \
   --sat-minimize='acc="Rabin 1",max-states=4sat-incr=2,sat-incr-steps=2' \
   foo.hoa --stats=%s >out && exit 1
 test -z "`cat out`"
-$autfilt \
+autfilt \
   --sat-minimize='acc="Rabin 1",max-states=4sat-incr=2,sat-incr-steps=50' \
   foo.hoa --stats=%s >out && exit 1
 test -z "`cat out`"
-$autfilt --sat-minimize='acc="Rabin 1",max-states=4,sat-naive' foo.hoa \
+autfilt --sat-minimize='acc="Rabin 1",max-states=4,sat-naive' foo.hoa \
 	 --stats=%s >out && exit 1
 test -z "`cat out`"
 
-$autfilt --sat-minimize='acc="Inf(0)&Fin(1)|Inf(2)",states=1' foo.hoa \
+autfilt --sat-minimize='acc="Inf(0)&Fin(1)|Inf(2)",states=1' foo.hoa \
 	 --stats=%s >out
 test "`cat out`" = 1
 
 
 options='acc="Inf(0)&Fin(1)|Inf(2)",states=1'
 
-$autfilt --sat-minimize=$options',sat-langmap' \
+autfilt --sat-minimize=$options',sat-langmap' \
   foo.hoa --stats=%s >out
 test "`cat out`" = 1
-$autfilt --sat-minimize=$options',sat-incr=1,sat-incr-steps=0' \
+autfilt --sat-minimize=$options',sat-incr=1,sat-incr-steps=0' \
   foo.hoa --stats=%s >out
 test "`cat out`" = 1
-$autfilt --sat-minimize=$options',sat-incr=1,sat-incr-steps=1' \
+autfilt --sat-minimize=$options',sat-incr=1,sat-incr-steps=1' \
   foo.hoa --stats=%s >out
 test "`cat out`" = 1
-$autfilt --sat-minimize=$options',sat-incr=1,sat-incr-steps=2' \
+autfilt --sat-minimize=$options',sat-incr=1,sat-incr-steps=2' \
   foo.hoa --stats=%s >out
 test "`cat out`" = 1
-$autfilt --sat-minimize=$options',sat-incr=1,sat-incr-steps=50' \
+autfilt --sat-minimize=$options',sat-incr=1,sat-incr-steps=50' \
   foo.hoa --stats=%s >out
 test "`cat out`" = 1
-$autfilt --sat-minimize=$options',sat-incr=2,sat-incr-steps=-1' \
+autfilt --sat-minimize=$options',sat-incr=2,sat-incr-steps=-1' \
   foo.hoa --stats=%s >out
 test "`cat out`" = 1
-$autfilt --sat-minimize=$options',sat-incr=2,sat-incr-steps=0' \
+autfilt --sat-minimize=$options',sat-incr=2,sat-incr-steps=0' \
   foo.hoa --stats=%s >out
 test "`cat out`" = 1
-$autfilt --sat-minimize=$options',sat-incr=2,sat-incr-steps=1' \
+autfilt --sat-minimize=$options',sat-incr=2,sat-incr-steps=1' \
   foo.hoa --stats=%s >out
 test "`cat out`" = 1
-$autfilt --sat-minimize=$options',sat-incr=2,sat-incr-steps=2' \
+autfilt --sat-minimize=$options',sat-incr=2,sat-incr-steps=2' \
   foo.hoa --stats=%s >out
 test "`cat out`" = 1
-$autfilt --sat-minimize=$options',sat-incr=2,sat-incr-steps=50' \
+autfilt --sat-minimize=$options',sat-incr=2,sat-incr-steps=50' \
   foo.hoa --stats=%s >out
 test "`cat out`" = 1
-$autfilt --sat-minimize=$options',sat-naive' \
+autfilt --sat-minimize=$options',sat-naive' \
   foo.hoa --stats=%s >out
 test "`cat out`" = 1
+
+# Make sure no extra state are added.  See issue #204
+test 2 = `ltl2tgba a | autfilt --sat-minimize --stats=%s`