test: Split-off 36-compare-arithmetic-negative.c.

* lib/tests/scaffold/36-compare-arithmetic.c (main): Move negative
divisions to...
* lib/tests/scaffold/36-compare-arithmetic-negative.c: ...new file here.
* build-aux/check-mescc.sh (mes_tests): Add it.

build-aux/check-mescc.sh

@@ -85,6 +85,7 @@ lib/tests/scaffold/33-and-or.c
 lib/tests/scaffold/34-pre-post.c
 lib/tests/scaffold/35-compare-char.c
 lib/tests/scaffold/36-compare-arithmetic.c
+lib/tests/scaffold/36-compare-arithmetic-negative.c
 lib/tests/scaffold/37-compare-assign.c
 lib/tests/scaffold/38-compare-call-2.c
 lib/tests/scaffold/38-compare-call-3.c

lib/tests/scaffold/36-compare-arithmetic-negative.c

@@ -0,0 +1,40 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2017,2018,2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ *
+ * This file is part of GNU Mes.
+ *
+ * GNU Mes 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.
+ *
+ * GNU Mes 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 GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <mes/lib-mini.h>
+
+int
+main ()
+{
+  oputs ("\n");
+  oputs ("t: 8 / -4\n");
+  if (8 / -4 != -2)
+    return 1;
+
+  oputs ("t: -8 / -4\n");
+  if (-8 / -4 != 2)
+    return 2;
+
+  oputs ("t: -8 / 4\n");
+  if (-8 / 4 != -2)
+    return 3;
+
+  return 0;
+}

lib/tests/scaffold/36-compare-arithmetic.c

@@ -44,17 +44,5 @@ main ()
   if (8 / 4 != 2)
     return 5;
 
-  oputs ("t: 8 / -4\n");
-  if (8 / -4 != -2)
-    return 6;
-
-  oputs ("t: -8 / -4\n");
-  if (-8 / -4 != 2)
-    return 7;
-
-  oputs ("t: -8 / 4\n");
-  if (-8 / 4 != -2)
-    return 8;
-
   return 0;
 }