Move memory corruption tests up a directory

test/write_after_free_small_reuse.c

@@ -0,0 +1,22 @@
+#include <stdlib.h>
+#include <string.h>
+
+#include "test_util.h"
+#include "../util.h"
+
+OPTNONE int main(void) {
+    char *p = malloc(128);
+    if (!p) {
+        return 1;
+    }
+    free(p);
+    UNUSED char *q = malloc(128);
+
+    p[65] = 'a';
+
+    // trigger reuse of the allocation
+    for (size_t i = 0; i < 100000; i++) {
+        free(malloc(128));
+    }
+    return 0;
+}