diff --git a/crates/agent/src/test_support.rs b/crates/agent/src/test_support.rs
index e37ed3502..2701c7a33 100644
--- a/crates/agent/src/test_support.rs
+++ b/crates/agent/src/test_support.rs
@@ -46,10 +46,6 @@ impl MockExecutionEnvironment {
 }
 
 impl MockExecutionEnvironment {
-    pub fn set_event_callback(&mut self, cb: crate::execution_env::ExecEnvEventCallback) {
-        self.event_callback = Some(cb);
-    }
-
     fn emit(&self, event: crate::execution_env::ExecutionEnvEvent) {
         if let Some(ref cb) = self.event_callback {
             cb(event);
diff --git a/crates/attractor/src/handler/script.rs b/crates/attractor/src/handler/script.rs
index 07d328bbd..c9988ee87 100644
--- a/crates/attractor/src/handler/script.rs
+++ b/crates/attractor/src/handler/script.rs
@@ -389,7 +389,7 @@ mod tests {
         let timing_path = logs_root.path().join("script_node").join("script_timing.json");
         let content = std::fs::read_to_string(&timing_path).unwrap();
         let json: serde_json::Value = serde_json::from_str(&content).unwrap();
-        assert!(json["duration_ms"].as_u64().unwrap() >= 0);
+        assert!(json["duration_ms"].is_u64());
         assert_eq!(json["exit_code"], 0);
         assert_eq!(json["timed_out"], false);
     }
@@ -442,7 +442,7 @@ mod tests {
         let timing_path = logs_root.path().join("script_node").join("script_timing.json");
         let content = std::fs::read_to_string(&timing_path).unwrap();
         let json: serde_json::Value = serde_json::from_str(&content).unwrap();
-        assert!(json["duration_ms"].as_u64().unwrap() >= 0);
+        assert!(json["duration_ms"].is_u64());
         assert_eq!(json["exit_code"], serde_json::Value::Null);
         assert_eq!(json["timed_out"], true);
     }