up3

server/block/block_behaviour_test.go

@@ -0,0 +1,32 @@
+package block_test
+
+import (
+	"testing"
+
+	"github.com/df-mc/dragonfly/server/block"
+	"github.com/df-mc/dragonfly/server/block/cube"
+	"github.com/df-mc/dragonfly/server/entity"
+	"github.com/df-mc/dragonfly/server/world"
+)
+
+// TestTorchBreaksWithoutSupport verifies that a torch is broken by a neighbour
+// update on the tick after its supporting block is removed, using a
+// synchronous World to make the tick deterministic.
+func TestTorchBreaksWithoutSupport(t *testing.T) {
+	w := world.Config{Synchronous: true, Entities: entity.DefaultRegistry}.New()
+	defer w.Close()
+
+	support, torch := cube.Pos{0, 0, 0}, cube.Pos{0, 1, 0}
+	<-w.Exec(func(tx *world.Tx) {
+		tx.SetBlock(support, block.Stone{}, nil)
+		tx.SetBlock(torch, block.Torch{Facing: cube.FaceDown}, nil)
+		tx.SetBlock(support, block.Air{}, nil)
+	})
+	w.AdvanceTick()
+
+	<-w.Exec(func(tx *world.Tx) {
+		if b := tx.Block(torch); b != (block.Air{}) {
+			t.Errorf("expected torch to break after removing its support, got %v", b)
+		}
+	})
+}