tests: More refactoring, add helper header to every test, override exit for better error reporting

tests/string/mem.c

@@ -2,6 +2,8 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include "test_helpers.h"
+
 int main(void) {
     puts("# mem #");
     char arr[100];

tests/string/strcat.c

@@ -1,6 +1,8 @@
 #include <string.h>
 #include <stdio.h>
 
+#include "test_helpers.h"
+
 int main(void) {
     char dest1[12] = "hello";
 	  printf("%s\n", strcat(dest1, " world")); // should be hello world

tests/string/strchr.c

@@ -1,6 +1,8 @@
 #include <string.h>
 #include <stdio.h>
 
+#include "test_helpers.h"
+
 int main(void) {
 	printf("%s\n", strchr("hello", 'e')); // should be ello
 	printf("%s\n", strchr("world", 'l')); // should be ld

tests/string/strcpy.c

@@ -1,6 +1,8 @@
 #include <stdio.h>
 #include <string.h>
 
+#include "test_helpers.h"
+
 int main(void) {
     char dst[20];
 

tests/string/strcspn.c

@@ -1,6 +1,8 @@
 #include <string.h>
 #include <stdio.h>
 
+#include "test_helpers.h"
+
 int main(void) {
 	char *world = "world";
 	printf("%ld\n", strcspn("hello", world)); // should be 2

tests/string/strncmp.c

@@ -1,6 +1,8 @@
 #include <string.h>
 #include <stdio.h>
 
+#include "test_helpers.h"
+
 int main(void) {
     printf("%d\n", strncmp("a", "aa", 2));
     printf("%d\n", strncmp("a", "aä", 2));

tests/string/strpbrk.c

@@ -1,6 +1,8 @@
 #include <string.h>
 #include <stdio.h>
 
+#include "test_helpers.h"
+
 int main(void) {
     char* source = "The quick drawn fix jumps over the lazy bug";
 

tests/string/strrchr.c

@@ -2,6 +2,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#include "test_helpers.h"
+
 int main(void) {
   char s0[] = "hello, world";
   char* ptr = strrchr(s0, 'l');

tests/string/strspn.c

@@ -1,6 +1,8 @@
 #include <string.h>
 #include <stdio.h>
 
+#include "test_helpers.h"
+
 int main(void) {
 	char *hello = "hello";
 	char *world = "world";

tests/string/strstr.c

@@ -1,6 +1,8 @@
 #include <string.h>
 #include <stdio.h>
 
+#include "test_helpers.h"
+
 int main(void) {
     printf("%s\n", strstr("In relibc we trust", "rust"));
     printf("%s\n", strstr("In relibc we trust", "libc"));

tests/string/strtok.c

@@ -1,6 +1,8 @@
 #include <string.h>
 #include <stdio.h>
 
+#include "test_helpers.h"
+
 int main(void) {
     char source[] = "I'd just like to interject for a moment.  What you're referring to as Linux, "
                     "is in fact, GNU/Linux, or as I've recently taken to calling it, GNU plus Linux.\n";

tests/string/strtok_r.c

@@ -1,6 +1,8 @@
 #include <string.h>
 #include <stdio.h>
 
+#include "test_helpers.h"
+
 int main(void) {
     char source[] = "I'd just like to interject for a moment.  What you're referring to as Linux, "
                     "is in fact, GNU/Linux, or as I've recently taken to calling it, GNU plus Linux.\n";