Use do_run_from_file() for test_strtol_dec

tests/core/test_strtol_dec.in

@@ -0,0 +1,22 @@
+
+      #include <stdio.h>
+      #include <stdlib.h>
+
+      int main() {
+        const char *STRING = "4 -38 +4711";
+        char *end_char;
+
+        // undefined base
+        long l1 = strtol(STRING, &end_char, 0);
+        long l2 = strtol(end_char, &end_char, 0);
+        long l3 = strtol(end_char, NULL, 0);
+
+        // defined base
+        long l4 = strtol(STRING, &end_char, 10);
+        long l5 = strtol(end_char, &end_char, 10);
+        long l6 = strtol(end_char, NULL, 10);
+
+        printf("%d%d%d%d%d%d\n", l1==4, l2==-38, l3==4711, l4==4, l5==-38, l6==4711);
+        return 0;
+      }
+    

tests/core/test_strtol_dec.out

@@ -0,0 +1 @@
+111111

tests/test_core.py

@@ -2397,29 +2397,10 @@ The current type of b is: 9
 
   def test_strtol_dec(self):
     # tests strtoll for decimal strings (0x...) 
-    src = r'''
+    test_path = path_from_root('tests', 'core', 'test_strtol_dec')
-      #include <stdio.h>
+    src, output = (test_path + s for s in ('.in', '.out'))
-      #include <stdlib.h>
 
-      int main() {
+    self.do_run_from_file(src, output)
-        const char *STRING = "4 -38 +4711";
-        char *end_char;
-
-        // undefined base
-        long l1 = strtol(STRING, &end_char, 0);
-        long l2 = strtol(end_char, &end_char, 0);
-        long l3 = strtol(end_char, NULL, 0);
-
-        // defined base
-        long l4 = strtol(STRING, &end_char, 10);
-        long l5 = strtol(end_char, &end_char, 10);
-        long l6 = strtol(end_char, NULL, 10);
-
-        printf("%d%d%d%d%d%d\n", l1==4, l2==-38, l3==4711, l4==4, l5==-38, l6==4711);
-        return 0;
-      }
-    '''
-    self.do_run(src, '111111')
 
   def test_strtol_bin(self):
     # tests strtoll for binary strings (0x...)