Minecraft 25w03a

18 Jan 2025 Original Changelog

The GameTest system is now open to the public.

Leaf Litter

Using leaf litter on a composter has a 30% chance to raise the compost level by 1.

Minecarts

If a minecart’s Motion in the x, y, or z directions is NaN, then the minecart’s motion will be treated as zero in all directions.

GameTest

The changelog is incorrect. The environment test instance field should instead be called batch.

When the GameTest server is started from command line, the server creates a superflat world with no structures and seed 0 (the number zero). Difficulty defaults to normal. All available feature flags except redstone_experiments and minecart_improvements will be enabled (this includes trade_rebalance).

Unlike how GameTest worked previously, no gamerules are changed by default. To restore previous behavior, set the following gamerules:

{
  "type": "minecraft:game_rules",
  "bool_rules": [
    {
      "rule": "doMobSpawning",
      "value": false
    },
    {
      "rule": "doWeatherCycle",
      "value": false
    },
    {
      "rule": "doFireTick",
      "value": false
    }
  ],
  "int_rules": [
    {
      "rule": "randomTickSpeed",
      "value": 0
    }
  ]
}

Tests spawn at a random coordinate between -14,999,992 and 14,999,992 in the x/z directions, and always at y=-59.

Exit Codes

Scenario	Exit Code
All required tests pass	0
Some required tests failed	(number of failures)
Server shut down without starting tests	-1
Failed to load vanilla datapack	-1
Crash	1

Test Block

The Test Block has one block state: test_block_mode, which can be one of start, log, fail, or accept. It does not change state when powered, so it will not trigger observers when powered.