test: Split-off scaffold/60-math-itoa.c.

* lib/tests/scaffold/60-math.c (main): Move itoa tests to...
* lib/tests/scaffold/60-math-itoa.c: ...this new file.
* build-aux/check-mescc.sh (mes_tests): Add it.

build-aux/check-mescc.sh

@@ -115,6 +115,7 @@ lib/tests/scaffold/54-argc.c
 lib/tests/scaffold/54-argv.c
 lib/tests/scaffold/55-char-array.c
 lib/tests/scaffold/60-math.c
+lib/tests/scaffold/60-math-itoa.c
 lib/tests/scaffold/61-array.c
 lib/tests/scaffold/62-array.c
 lib/tests/scaffold/63-struct.c

lib/tests/scaffold/60-math-itoa.c

@@ -0,0 +1,50 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2017,2018 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 <limits.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <mes/lib.h>
+
+int
+main ()
+{
+  int i;
+
+  oputs ("\n");
+
+  oputs ("t: i = INT_MAX\n");
+  i = INT_MAX;
+
+  if (strcmp ("2147483647", itoa (i)))
+    return 1;
+
+  oputs ("t: i = 2147483646\n");
+  i = INT_MIN;
+
+  if (strcmp ("-2147483648", itoa (i)))
+    return 2;
+
+  if (strcmp ("-80000000", ntoab (i, 16, 1)))
+    return 3;
+
+  return 0;
+}

lib/tests/scaffold/60-math.c

@@ -181,9 +181,6 @@ ok1:
   oputs ("t: i = INT_MAX\n");
   i = INT_MAX;
 
-  if (strcmp ("2147483647", itoa (i)))
-    return 33;
-
   oputs ("t: i = 2147483646\n");
   i = 2147483646;
 
@@ -193,12 +190,6 @@ ok1:
   oputs ("t: i = INT_MIN\n");
   i = INT_MIN;
 
-  if (strcmp ("-2147483648", itoa (i)))
-    return 34;
-
-  if (strcmp ("-80000000", ntoab (i, 16, 1)))
-    return 35;
-
   oputs ("t: i = -2147483647\n");
   i = -2147483647;