feat: hit on primitives

client/world/world_id_allocator_test.go

@@ -0,0 +1,37 @@
+package world
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestWorldPrimitiveID_ReusesFreedIDs(t *testing.T) {
+	t.Parallel()
+
+	w := NewWorld(10, 10)
+
+	id1, err := w.AddPoint(1, 1)
+	require.NoError(t, err)
+
+	id2, err := w.AddPoint(2, 2)
+	require.NoError(t, err)
+
+	require.NotEqual(t, id1, id2)
+
+	require.NoError(t, w.Remove(id1))
+
+	id3, err := w.AddPoint(3, 3)
+	require.NoError(t, err)
+
+	// LIFO free-list: id1 should be reused.
+	require.Equal(t, id1, id3)
+}
+
+func TestWorldRemove_UnknownID(t *testing.T) {
+	t.Parallel()
+
+	w := NewWorld(10, 10)
+	err := w.Remove(12345)
+	require.ErrorIs(t, err, errNoSuchObject)
+}