test(collab-net): add ignored loopback test exercising welcome delivery above 64 MiB

crates/collab-net/src/loopback_tests.rs

@@ -708,3 +708,33 @@ fn oversized_server_message_reports_accurate_diagnostic() {
     assert!(!welcomed(&gp.events));
     host.stop();
 }
+
+#[test]
+#[ignore = "allocates a document larger than 64 MiB: cargo test -p figcraft-collab-net -- --ignored"]
+fn welcome_larger_than_64_mib_is_delivered() {
+    let mut doc = Document::new("A".repeat((64 << 20) + 4096));
+    doc.repair();
+    let probe = Probe::new();
+    let limits = NetLimits { max_client_message: 1024, max_server_message: 128 << 20, ..fast_limits() };
+    let cfg = HostConfig {
+        addr: SocketAddr::from(([127, 0, 0, 1], 0)),
+        any_port_if_taken: false,
+        file: FILE.into(),
+        token: TOKEN.into(),
+        doc,
+        name: "Hana".into(),
+        limits,
+        core: Limits { max_message_bytes: 128 << 20, ..Limits::default() },
+    };
+    let mut host = Host::start(cfg, probe.inbox.clone()).unwrap();
+    let invite = Invite::new(host.addr().to_string(), FILE, TOKEN);
+
+    let guest_probe = Probe::new();
+    let mut guest_cfg = quick(GuestConfig::new(invite, "Ada".into()));
+    guest_cfg.limits = limits;
+    let _g = Guest::start(guest_cfg, guest_probe.inbox.clone()).unwrap();
+    let mut gp = guest_probe;
+    gp.wait("welcome", welcomed);
+    assert!(welcomed(&gp.events));
+    host.stop();
+}