test(wasm-actor): cycle 90 — mixed payloads, i64 global, stopped-never-responds fuzz (410 tests)

Added 5 tests: mixed payload types, i64 global, all three guest types, stopped
actor never responds property test, exact 33-byte echo. No new bugs found.

Authored by Claude, lovingly guided by Zachery Aaron Shores-Chmielewski

crates/wasm-actor/tests/wasm_actor.rs

@@ -12966,4 +12966,128 @@ fn alloc_works_then_returns_negative() {
     rt.send_to(addr, framed_msg(inbox.addr(), b"drop")).unwrap();
     rt.tick();
     assert!(inbox.try_recv().is_none());
+}
+
+// ── Cycle 90 ─────────────────────────────────────────────────────────────────
+
+// Mixed payload types: binary + text + numbers — all echo correctly
+#[test]
+fn echo_mixed_payload_types() {
+    let engine = SharedEngine::new().unwrap();
+    let actor = WasmActorBuilder::new(engine, guest_wasm("echo")).build().unwrap();
+    let rt = Runtime::new(RuntimeConfig::default());
+    let inbox = rt.new_inbox::<ByteMessage>().unwrap();
+    let addr = rt.spawn(actor).unwrap();
+
+    let payloads: Vec<Vec<u8>> = vec![
+        b"hello world".to_vec(),
+        vec![0x00, 0xFF, 0x80],
+        (0..100).collect(),
+        vec![0u8; 1],
+        b"\x00\x01\x02\x03\x04".to_vec(),
+    ];
+
+    for p in &payloads {
+        rt.send_to(addr, framed_msg(inbox.addr(), p)).unwrap();
+    }
+    rt.tick();
+
+    let msgs: Vec<Vec<u8>> = std::iter::from_fn(|| inbox.try_recv().map(|m| m.0)).collect();
+    assert_eq!(msgs.len(), payloads.len());
+    for (got, expected) in msgs.iter().zip(payloads.iter()) {
+        assert_eq!(got, expected);
+    }
+}
+
+// Guest with global initialized to i64
+#[test]
+fn guest_i64_global() {
+    let wat = r#"(module
+        (memory (export "memory") 1)
+        (global $g (mut i64) (i64.const 9999999999))
+        (func (export "alloc") (param $len i32) (result i32) i32.const 1024)
+        (func (export "handle") (param $ptr i32) (param $len i32)
+            (global.set $g (i64.add (global.get $g) (i64.const 1)))
+            (i64.store (local.get $ptr) (global.get $g))
+        )
+    )"#;
+    let engine = SharedEngine::new().unwrap();
+    let actor = WasmActorBuilder::new(engine, wat::parse_str(wat).unwrap())
+        .build().unwrap();
+    let rt = Runtime::new(RuntimeConfig::default());
+    let addr = rt.spawn(actor).unwrap();
+    rt.send_to(addr, ByteMessage(vec![0u8; 8])).unwrap();
+    rt.tick();
+}
+
+// Spawn echo, double, and silent — each processes its type-specific behavior
+#[test]
+fn all_three_guest_types_in_one_runtime() {
+    let engine = SharedEngine::new().unwrap();
+    let echo = WasmActorBuilder::new(engine.clone(), guest_wasm("echo")).build().unwrap();
+    let double = WasmActorBuilder::new(engine.clone(), guest_wasm("double")).build().unwrap();
+    let silent = WasmActorBuilder::new(engine, guest_wasm("silent")).build().unwrap();
+
+    let rt = Runtime::new(RuntimeConfig::default());
+    let inbox = rt.new_inbox::<ByteMessage>().unwrap();
+    let e = rt.spawn(echo).unwrap();
+    let d = rt.spawn(double).unwrap();
+    let s = rt.spawn(silent).unwrap();
+
+    rt.send_to(e, framed_msg(inbox.addr(), b"e")).unwrap();
+    rt.send_to(d, framed_msg(inbox.addr(), b"d")).unwrap();
+    rt.send_to(s, ByteMessage(b"s".to_vec())).unwrap();
+    rt.tick();
+
+    let msgs: Vec<Vec<u8>> = std::iter::from_fn(|| inbox.try_recv().map(|m| m.0)).collect();
+    assert_eq!(msgs.len(), 3, "echo(1) + double(2) + silent(0) = 3");
+}
+
+// Property: stopping an actor always makes it unresponsive
+proptest! {
+    #[test]
+    fn prop_stopped_actor_never_responds(
+        n_before in 0usize..10,
+        n_after in 1usize..10,
+    ) {
+        let engine = SharedEngine::new().unwrap();
+        let actor = WasmActorBuilder::new(engine, guest_wasm("echo")).build().unwrap();
+        let rt = Runtime::new(RuntimeConfig::default());
+        let inbox = rt.new_inbox::<ByteMessage>().unwrap();
+        let addr = rt.spawn(actor).unwrap();
+
+        for _ in 0..n_before {
+            let _ = rt.send_to(addr, framed_msg(inbox.addr(), b"x"));
+        }
+        rt.tick();
+        // Drain inbox
+        while inbox.try_recv().is_some() {}
+
+        rt.stop_actor(addr);
+        rt.tick();
+
+        for _ in 0..n_after {
+            let _ = rt.send_to(addr, framed_msg(inbox.addr(), b"y"));
+        }
+        rt.tick();
+        rt.tick();
+
+        assert!(inbox.try_recv().is_none(), "stopped actor should never respond");
+    }
+}
+
+// Echo with exactly 33 bytes (32 addr + 1 payload byte)
+#[test]
+fn echo_exactly_thirty_three_bytes() {
+    let engine = SharedEngine::new().unwrap();
+    let actor = WasmActorBuilder::new(engine, guest_wasm("echo")).build().unwrap();
+    let rt = Runtime::new(RuntimeConfig::default());
+    let inbox = rt.new_inbox::<ByteMessage>().unwrap();
+    let addr = rt.spawn(actor).unwrap();
+
+    rt.send_to(addr, framed_msg(inbox.addr(), &[0x42])).unwrap();
+    rt.tick();
+
+    let resp = inbox.try_recv().expect("single byte payload echo");
+    assert_eq!(resp.0, vec![0x42]);
 }