1 files changed, 136 insertions, 0 deletions
diff --git a/azalea-client/tests/login_to_dimension_with_same_name.rs b/azalea-client/tests/login_to_dimension_with_same_name.rs
new file mode 100644
index 00000000..be362bb7
--- /dev/null
+++ b/azalea-client/tests/login_to_dimension_with_same_name.rs
@@ -0,0 +1,136 @@
+use azalea_client::{InConfigState, InGameState, InstanceHolder, test_simulation::*};
+use azalea_core::{position::ChunkPos, resource_location::ResourceLocation};
+use azalea_entity::LocalEntity;
+use azalea_protocol::packets::{
+    ConnectionProtocol, Packet,
+    config::{ClientboundFinishConfiguration, ClientboundRegistryData},
+    game::ClientboundStartConfiguration,
+};
+use azalea_registry::{DataRegistry, DimensionType};
+use azalea_world::InstanceName;
+use bevy_log::tracing_subscriber;
+use simdnbt::owned::{NbtCompound, NbtTag};
+
+#[test]
+fn test_login_to_dimension_with_same_name() {
+    let _ = tracing_subscriber::fmt().try_init();
+
+    generic_test_login_to_dimension_with_same_name(true);
+    generic_test_login_to_dimension_with_same_name(false);
+}
+
+fn generic_test_login_to_dimension_with_same_name(using_respawn: bool) {
+    let make_basic_login_or_respawn_packet = if using_respawn {
+        |dimension: DimensionType, instance_name: ResourceLocation| {
+            make_basic_respawn_packet(dimension, instance_name).into_variant()
+        }
+    } else {
+        |dimension: DimensionType, instance_name: ResourceLocation| {
+            make_basic_login_packet(dimension, instance_name).into_variant()
+        }
+    };
+
+    let _ = tracing_subscriber::fmt::try_init();
+
+    let mut simulation = Simulation::new(ConnectionProtocol::Configuration);
+    assert!(simulation.has_component::<InConfigState>());
+    assert!(!simulation.has_component::<InGameState>());
+
+    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)),
+            ])),
+        )]
+        .into_iter()
+        .collect(),
+    });
+    simulation.tick();
+    simulation.receive_packet(ClientboundFinishConfiguration);
+    simulation.tick();
+
+    assert!(!simulation.has_component::<InConfigState>());
+    assert!(simulation.has_component::<InGameState>());
+    assert!(simulation.has_component::<LocalEntity>());
+
+    //
+    // OVERWORLD 1
+    //
+
+    simulation.receive_packet(make_basic_login_packet(
+        DimensionType::new_raw(0), // overworld
+        ResourceLocation::new("azalea:overworld"),
+    ));
+    simulation.tick();
+
+    assert_eq!(
+        *simulation.component::<InstanceName>(),
+        ResourceLocation::new("azalea:overworld"),
+        "InstanceName should be azalea:overworld after setting dimension to that"
+    );
+
+    simulation.receive_packet(make_basic_empty_chunk(ChunkPos::new(0, 0), (384 + 64) / 16));
+    simulation.tick();
+    // make sure the chunk exists
+    simulation
+        .chunk(ChunkPos::new(0, 0))
+        .expect("chunk should exist");
+
+    //
+    // OVERWORLD 2
+    //
+
+    simulation.receive_packet(ClientboundStartConfiguration);
+    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(256)),
+                ("min_y".into(), NbtTag::Int(0)),
+            ])),
+        )]
+        .into_iter()
+        .collect(),
+    });
+    simulation.receive_packet(ClientboundFinishConfiguration);
+    simulation.receive_packet(make_basic_login_or_respawn_packet(
+        DimensionType::new_raw(0),
+        ResourceLocation::new("azalea:overworld"),
+    ));
+    simulation.tick();
+
+    assert!(
+        simulation.chunk(ChunkPos::new(0, 0)).is_none(),
+        "chunk should not exist immediately after changing dimensions"
+    );
+    assert_eq!(
+        *simulation.component::<InstanceName>(),
+        ResourceLocation::new("azalea:overworld"),
+        "InstanceName should still be azalea:overworld after changing dimensions to that"
+    );
+    assert_eq!(
+        simulation
+            .component::<InstanceHolder>()
+            .instance
+            .read()
+            .chunks
+            .height,
+        256
+    );
+
+    simulation.receive_packet(make_basic_empty_chunk(ChunkPos::new(0, 0), 256 / 16));
+    simulation.tick();
+    // make sure the chunk exists
+    simulation
+        .chunk(ChunkPos::new(0, 0))
+        .expect("chunk should exist");
+    simulation.receive_packet(make_basic_login_or_respawn_packet(
+        DimensionType::new_raw(2), // nether
+        ResourceLocation::new("minecraft:nether"),
+    ));
+    simulation.tick();
+}