Make all tests not output anything

src/lib.rs

@@ -11,6 +11,7 @@ pub mod ops;
 pub mod stack;
 pub mod pool;
 pub mod frame;
+pub mod stubs;
 
 #[cfg(feature = "bonus:network")]
 pub mod netstack;

src/stubs.rs

@@ -0,0 +1,6 @@
+use std::sync::{Arc, Mutex};
+use std::io::Cursor;
+
+pub fn output_stub() -> Arc<Mutex<Cursor<Vec<u8>>>> {
+    Arc::new(Mutex::new(Cursor::new(Vec::new())))
+}