From 7f58887ae33893c981fbdff23d4e1fa4a11c32e4 Mon Sep 17 00:00:00 2001
From: Jude Melton-Houghton <jwmhjwmh@gmail.com>
Date: Tue, 10 May 2022 16:37:33 -0400
Subject: Support packing arbitrary graphs (#12289)

---
 games/devtest/mods/unittests/async_env.lua | 37 ++++++++++++++++++++++--------
 1 file changed, 28 insertions(+), 9 deletions(-)

(limited to 'games/devtest/mods')

diff --git a/games/devtest/mods/unittests/async_env.lua b/games/devtest/mods/unittests/async_env.lua
index aff1fc4d9..3a21bd9e2 100644
--- a/games/devtest/mods/unittests/async_env.lua
+++ b/games/devtest/mods/unittests/async_env.lua
@@ -60,15 +60,34 @@ local function test_object_passing()
 	local tmp = core.serialize_roundtrip(test_object)
 	assert(deepequal(test_object, tmp))
 
-	-- 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
 end
 unittests.register("test_object_passing", test_object_passing)
 
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