fix: initialize global VM in tests to prevent segfaults

Author: ProgrammerKR

tests/bytecode_tests.c

@@ -13,6 +13,7 @@
 */
 
 #include "../include/bytecode.h"
+#include "../include/vm.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -26,6 +27,7 @@ void disasm_chunk(const Chunk *chunk);
 int vm_run_chunk_simple(const Chunk *chunk);
 
 int main(void) {
+    initVM(&vm);
     printf("ProXPL bytecode tests start\n");
     printf("OP_CONSTANT: %d, OP_NOP: %d\n", OP_CONSTANT, OP_NOP);
 

tests/test_opcode_roundtrip.c

@@ -14,6 +14,7 @@
 #include <string.h>
 #include <assert.h>
 #include "bytecode.h"
+#include "../include/vm.h"
 
 #include "../include/value.h"
 #include "../include/object.h"
@@ -22,6 +23,7 @@
 // So we need vm stub or link with vm_stub.o
 
 int main(void) {
+    initVM(&vm);
     const char *tmp = "tests/tmp_opcode_rt.proxbc";
 
     Chunk c;