Add some simple tests

tests/test_set.c

@@ -0,0 +1,34 @@
+#include <stdio.h>
+#include "../set.h"
+
+int main(void) {
+    set_t* set = set_create(sizeof(int));
+    if (!set) {
+        fprintf(stderr, "Failed to create set\n");
+        return 1;
+    }
+
+    for (int i = 0; i < 10; ++i) {
+        if (set_insert(set, &i) != 0) {
+            fprintf(stderr, "Failed to insert %d\n", i);
+            set_destroy(&set);
+            return 1;
+        }
+    }
+
+    for (size_t i = 0; i < set_size(set); ++i) {
+        int* value = (int*)set_get_const(set, i);
+        if (value) {
+            printf("set[%zu] = %d\n", i, *value);
+        } else {
+            fprintf(stderr, "Failed to get value at index %zu\n", i);
+        }
+    }
+
+    set_destroy(&set);
+    if (set != NULL) {
+        fprintf(stderr, "Set pointer was not set to NULL after destruction\n");
+        return 1;
+    }
+    return 0;
+}