diff --git a/v0/test_token.c b/v0/test_token.c
index af8c14b..81d9325 100644
--- a/v0/test_token.c
+++ b/v0/test_token.c
@@ -1,30 +1,14 @@
 #include "test.h"
 #include "token.h"
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-/* Helper to create a test file with content */
-static void write_test_file(const char* filename, const char* content) {
-	FILE* f = fopen(filename, "w");
-	if (f) {
-		fputs(content, f);
-		fclose(f);
-	}
-}
 
 static void test_tokenstream_open_fail(void) {
-	Buffer* buf = buffer_open_file("v0/does_not_exist.c2");
-	if (buf != NULL) fail("expected NULL for non-existent file");
-	
-	TokenStream* ts = tokenstream_open(buf);
+	TokenStream* ts = tokenstream_open(NULL);
 	if (ts != NULL) fail("expected NULL for NULL buffer");
 }
 
 static void test_tokenstream_simple_keyword(void) {
-	write_test_file("v0/test_token_tmp.c2", "module");
-	Buffer* buf = buffer_open_file("v0/test_token_tmp.c2");
-	if (buf == NULL) fail("could not open file");
+	Buffer* buf = buffer_open_string("module");
+	if (buf == NULL) fail("could not create buffer");
 
 	TokenStream* ts = tokenstream_open(buf);
 	if (ts == NULL) fail("could not create tokenstream");
@@ -39,9 +23,8 @@ static void test_tokenstream_simple_keyword(void) {
 }
 
 static void test_tokenstream_keywords_and_symbols(void) {
-	write_test_file("v0/test_token_tmp.c2", "module main; import stdio;");
-	Buffer* buf = buffer_open_file("v0/test_token_tmp.c2");
-	if (buf == NULL) fail("could not open file");
+	Buffer* buf = buffer_open_string("module main; import stdio;");
+	if (buf == NULL) fail("could not create buffer");
 
 	TokenStream* ts = tokenstream_open(buf);
 	if (ts == NULL) fail("could not create tokenstream");
@@ -58,9 +41,8 @@ static void test_tokenstream_keywords_and_symbols(void) {
 }
 
 static void test_tokenstream_parentheses_and_brackets(void) {
-	write_test_file("v0/test_token_tmp.c2", "()[]");
-	Buffer* buf = buffer_open_file("v0/test_token_tmp.c2");
-	if (buf == NULL) fail("could not open file");
+	Buffer* buf = buffer_open_string("()[]");
+	if (buf == NULL) fail("could not create buffer");
 
 	TokenStream* ts = tokenstream_open(buf);
 	if (ts == NULL) fail("could not create tokenstream");
@@ -75,9 +57,8 @@ static void test_tokenstream_parentheses_and_brackets(void) {
 }
 
 static void test_tokenstream_comma(void) {
-	write_test_file("v0/test_token_tmp.c2", "a,b,c");
-	Buffer* buf = buffer_open_file("v0/test_token_tmp.c2");
-	if (buf == NULL) fail("could not open file");
+	Buffer* buf = buffer_open_string("a,b,c");
+	if (buf == NULL) fail("could not create buffer");
 
 	TokenStream* ts = tokenstream_open(buf);
 	if (ts == NULL) fail("could not create tokenstream");
@@ -93,9 +74,8 @@ static void test_tokenstream_comma(void) {
 }
 
 static void test_tokenstream_whitespace_ignored(void) {
-	write_test_file("v0/test_token_tmp.c2", "  module  \n\t import  ;  ");
-	Buffer* buf = buffer_open_file("v0/test_token_tmp.c2");
-	if (buf == NULL) fail("could not open file");
+	Buffer* buf = buffer_open_string("  module  \n\t import  ;  ");
+	if (buf == NULL) fail("could not create buffer");
 
 	TokenStream* ts = tokenstream_open(buf);
 	if (ts == NULL) fail("could not create tokenstream");
@@ -109,9 +89,8 @@ static void test_tokenstream_whitespace_ignored(void) {
 }
 
 static void test_tokenstream_void_function_signature(void) {
-	write_test_file("v0/test_token_tmp.c2", "void main()");
-	Buffer* buf = buffer_open_file("v0/test_token_tmp.c2");
-	if (buf == NULL) fail("could not open file");
+	Buffer* buf = buffer_open_string("void main()");
+	if (buf == NULL) fail("could not create buffer");
 
 	TokenStream* ts = tokenstream_open(buf);
 	if (ts == NULL) fail("could not create tokenstream");