REMOVE ME Show example usage

packages/vm/src/instance.rs

@@ -403,6 +403,7 @@ where
 mod tests {
     use std::sync::atomic::{AtomicBool, Ordering};
     use std::sync::Arc;
+    use std::time::SystemTime;
 
     use super::*;
     use crate::backend::Storage;
@@ -716,9 +717,27 @@ mod tests {
         assert_eq!(report1.limit, LIMIT);
         assert_eq!(report1.remaining, LIMIT);
 
+        // Test this with
+        // (cd packages/vm && cargo test create_gas_report_works -- --nocapture)
+        let start = SystemTime::now();
+        instance.set_debug_handler(move |msg: &str, gas_remaining| {
+            let ts = SystemTime::now().duration_since(start).unwrap().as_micros();
+            println!("{msg} (gas: {gas_remaining}, runtime: {ts}µs)");
+        });
+
         // init contract
         let info = mock_info("creator", &coins(1000, "earth"));
         let msg = br#"{"verifier": "verifies", "beneficiary": "benefits"}"#;
+        call_instantiate::<_, _, _, Empty>(&mut instance, &mock_env(), &info, msg)
+            .unwrap()
+            .unwrap();
+        call_instantiate::<_, _, _, Empty>(&mut instance, &mock_env(), &info, msg)
+            .unwrap()
+            .unwrap();
+        call_instantiate::<_, _, _, Empty>(&mut instance, &mock_env(), &info, msg)
+            .unwrap()
+            .unwrap();
+        instance.unset_debug_handler();
         call_instantiate::<_, _, _, Empty>(&mut instance, &mock_env(), &info, msg)
             .unwrap()
             .unwrap();

packages/vm/src/testing/instance.rs

@@ -72,6 +72,7 @@ pub fn mock_instance_with_gas_limit(
         wasm,
         MockInstanceOptions {
             gas_limit,
+            print_debug: true,
             ..Default::default()
         },
     )