- -- Circular key, should error
- tmp = {"foo", "bar"}
- tmp[tmp] = true
- assert(not pcall(core.serialize_roundtrip, tmp))
-
- -- Circular value, should error
- tmp = {"foo"}
- tmp[2] = tmp
- assert(not pcall(core.serialize_roundtrip, tmp))
+ local circular_key = {"foo", "bar"}
+ circular_key[circular_key] = true
+ tmp = core.serialize_roundtrip(circular_key)
+ assert(tmp[1] == "foo")
+ assert(tmp[2] == "bar")
+ assert(tmp[tmp] == true)
+
+ local circular_value = {"foo"}
+ circular_value[2] = circular_value
+ tmp = core.serialize_roundtrip(circular_value)
+ assert(tmp[1] == "foo")
+ assert(tmp[2] == tmp)
+
+ -- Two-segment cycle
+ local cycle_seg_1, cycle_seg_2 = {}, {}
+ cycle_seg_1[1] = cycle_seg_2
+ cycle_seg_2[1] = cycle_seg_1
+ tmp = core.serialize_roundtrip(cycle_seg_1)
+ assert(tmp[1][1] == tmp)
+
+ -- Duplicated value without a cycle
+ local acyclic_dup_holder = {}
+ tmp = ItemStack("")
+ acyclic_dup_holder[tmp] = tmp
+ tmp = core.serialize_roundtrip(acyclic_dup_holder)
+ for k, v in pairs(tmp) do
+ assert(rawequal(k, v))
+ end