Add missing item alias metatables to async environment (#12458)

games/devtest/mods/unittests/async_env.lua

@@ -123,10 +123,10 @@ local function test_handle_async(cb)
 
 	core.handle_async(func, function(...)
 		if not deepequal(expect, {...}) then
-			cb("Values did not equal")
+			return cb("Values did not equal")
 		end
 		if core.get_last_run_mod() ~= expect[1] then
-			cb("Mod name not tracked correctly")
+			return cb("Mod name not tracked correctly")
 		end
 
 		-- Test passing of nil arguments and return values
@@ -134,7 +134,7 @@ local function test_handle_async(cb)
 			return a, b
 		end, function(a, b)
 			if b ~= 123 then
-				cb("Argument went missing")
+				return cb("Argument went missing")
 			end
 			cb()
 		end, nil, 123)
@@ -151,7 +151,7 @@ local function test_userdata_passing2(cb, _, pos)
 		return vm_:get_node_at(pos_)
 	end, function(ret)
 		if not deepequal(expect, ret) then
-			cb("Node data mismatch (one-way)")
+			return cb("Node data mismatch (one-way)")
 		end
 
 		-- VManip: test a roundtrip
@@ -159,7 +159,7 @@ local function test_userdata_passing2(cb, _, pos)
 			return vm_
 		end, function(vm2)
 			if not deepequal(expect, vm2:get_node_at(pos)) then
-				cb("Node data mismatch (roundtrip)")
+				return cb("Node data mismatch (roundtrip)")
 			end
 			cb()
 		end, vm)

games/devtest/mods/unittests/init.lua

@@ -36,6 +36,7 @@ local function await(invoke)
 			called_early = {...}
 		else
 			coroutine.resume(co, ...)
+			co = nil
 		end
 	end)
 	if called_early ~= true then

games/devtest/mods/unittests/inside_async_env.lua

@@ -2,7 +2,7 @@ unittests = {}
 
 core.log("info", "Hello World")
 
-function unittests.async_test()
+local function do_tests()
 	assert(core == minetest)
 	-- stuff that should not be here
 	assert(not core.get_player_by_name)
@@ -11,5 +11,15 @@ function unittests.async_test()
 	-- stuff that should be here
 	assert(ItemStack)
 	assert(core.registered_items[""])
-	return true
+	-- alias handling
+	assert(core.registered_items["unittests:steel_ingot_alias"].name ==
+		"unittests:steel_ingot")
+end
+
+function unittests.async_test()
+	local ok, err = pcall(do_tests)
+	if not ok then
+		core.log("error", err)
+	end
+	return ok
 end

games/devtest/mods/unittests/misc.lua

@@ -24,7 +24,7 @@ local function test_dynamic_media(cb, player)
 		to_player = player:get_player_name(),
 	}, function(name)
 		if not call_ok then
-			cb("impossible condition")
+			return cb("impossible condition")
 		end
 		cb()
 	end)