From cf66c4be100c898c64d57f9b92f31f809764dc2e Mon Sep 17 00:00:00 2001
From: mat <git@matdoes.dev>
Date: Thu, 6 Mar 2025 04:11:05 +0000
Subject: fix despawning entities on dimension change

---
 .../despawn_entities_when_changing_dimension.rs    | 97 ++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 azalea-client/tests/despawn_entities_when_changing_dimension.rs

(limited to 'azalea-client/tests')

diff --git a/azalea-client/tests/despawn_entities_when_changing_dimension.rs b/azalea-client/tests/despawn_entities_when_changing_dimension.rs
new file mode 100644
index 00000000..39cea091
--- /dev/null
+++ b/azalea-client/tests/despawn_entities_when_changing_dimension.rs
@@ -0,0 +1,97 @@
+use azalea_client::{InConfigState, InGameState, test_simulation::*};
+use azalea_core::{
+    delta::PositionDelta8,
+    position::{ChunkPos, Vec3},
+    resource_location::ResourceLocation,
+};
+use azalea_entity::{LocalEntity, metadata::Cow};
+use azalea_protocol::packets::{
+    ConnectionProtocol,
+    config::{ClientboundFinishConfiguration, ClientboundRegistryData},
+    game::ClientboundAddEntity,
+};
+use azalea_registry::DimensionType;
+use azalea_world::InstanceName;
+use bevy_ecs::{entity::Entity, query::With};
+use bevy_log::tracing_subscriber;
+use simdnbt::owned::{NbtCompound, NbtTag};
+use uuid::Uuid;
+
+#[test]
+fn test_despawn_entities_when_changing_dimension() {
+    let _ = tracing_subscriber::fmt::try_init();
+
+    let mut simulation = Simulation::new(ConnectionProtocol::Configuration);
+    simulation.receive_packet(ClientboundRegistryData {
+        registry_id: ResourceLocation::new("minecraft:dimension_type"),
+        entries: vec![
+            (
+                ResourceLocation::new("minecraft:overworld"),
+                Some(NbtCompound::from_values(vec![
+                    ("height".into(), NbtTag::Int(384)),
+                    ("min_y".into(), NbtTag::Int(-64)),
+                ])),
+            ),
+            (
+                ResourceLocation::new("minecraft:nether"),
+                Some(NbtCompound::from_values(vec![
+                    ("height".into(), NbtTag::Int(256)),
+                    ("min_y".into(), NbtTag::Int(0)),
+                ])),
+            ),
+        ]
+        .into_iter()
+        .collect(),
+    });
+    simulation.tick();
+    simulation.receive_packet(ClientboundFinishConfiguration);
+    simulation.tick();
+
+    //
+    // OVERWORLD
+    //
+
+    simulation.receive_packet(make_basic_login_packet(
+        DimensionType::new_raw(0), // overworld
+        ResourceLocation::new("azalea:a"),
+    ));
+    simulation.tick();
+
+    simulation.receive_packet(make_basic_empty_chunk(ChunkPos::new(0, 0), (384 + 64) / 16));
+    simulation.tick();
+    // spawn a cow
+    simulation.receive_packet(ClientboundAddEntity {
+        id: 123.into(),
+        uuid: Uuid::from_u128(1234),
+        entity_type: azalea_registry::EntityKind::Cow,
+        position: Vec3::new(0., 64., 0.),
+        x_rot: 0,
+        y_rot: 0,
+        y_head_rot: 0,
+        data: 0,
+        velocity: PositionDelta8::default(),
+    });
+    simulation.tick();
+    // make sure it's spawned
+    let mut cow_query = simulation.app.world_mut().query_filtered::<(), With<Cow>>();
+    let cow_iter = cow_query.iter(simulation.app.world());
+    assert_eq!(cow_iter.count(), 1, "cow should be spawned");
+
+    //
+    // NETHER
+    //
+
+    simulation.receive_packet(make_basic_respawn_packet(
+        DimensionType::new_raw(1), // nether
+        ResourceLocation::new("azalea:b"),
+    ));
+    simulation.tick();
+
+    // cow should be completely deleted from the ecs
+    let cow_iter = cow_query.iter(simulation.app.world());
+    assert_eq!(
+        cow_iter.count(),
+        0,
+        "cow should be despawned after switching dimensions"
+    );
+}
-- 
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