diff --git a/v0/test.c b/v0/test.c
index ef52077..e317795 100644
--- a/v0/test.c
+++ b/v0/test.c
@@ -75,6 +75,7 @@ static TestCase s_tests[] = {
     {"parser_module_name", test_parser_module_name},
     {"log_error", test_log_error},
     {"log_on_line", test_log_on_line},
+    {"log_on_line_format", test_log_on_line_format},
 };
 
 
diff --git a/v0/test_log.c b/v0/test_log.c
index 18acc42..b690330 100644
--- a/v0/test_log.c
+++ b/v0/test_log.c
@@ -28,16 +28,16 @@ static void test_log_on_line(void) {
         "   unexpected token\n";
 
     log_on_line("test.c", "int main() []", 1, 12, 13, "unexpected token");
-    
     assert_log(expected, "expected formatted error message");
+}
 
-    log_clear();
-    const char* expected2 =
+static void test_log_on_line_format(void) {
+    const char* expected =
         "--- test.c ---\n"
         "1| int main() []\n"
         "              ^^\n"
         "   unexpected token 'x'\n";
 
     log_on_line("test.c", "int main() []", 1, 12, 13, "unexpected token '%c'", 'x');
-    assert_log(expected2, "expected formatted error message with variadic args");
+    assert_log(expected, "expected formatted error message with variadic args");
 }
\ No newline at end of file