test: add automated latitude validation via GameTest server
Run `./gradlew runGameTestServer` to validate the latitude biome system without manual in-game testing. Boots a headless game server (full biome registry), samples a 32000x32000 grid through LatitudeBiomeSource, renders a PNG map and writes a distribution report, then asserts climate invariants: - spawn on a safe biome (plains/forest) - FROZEN band dominated by cold/frozen biomes (>60%) - HOT band dominated by warm/hot biomes (>60%) - swamp remains rare in the temperate band (<15%) Outputs land in run/gametest-results/latitude/ (latitude_map.png + latitude_report.txt). Sampling is BiomeSource-only (no chunk generation), so it runs in ~35s regardless of installed mods. - LatitudeGameTest: @GameTestHolder + @PrefixGameTestTemplate(false) - structure/empty_1x1.nbt: minimal 1x1x1 air structure required by GameTest - build.gradle: add gameTestServer run configuration
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feldenr
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package net.mcreator.customoregen.worldgen;
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import net.mcreator.customoregen.CustomOreGenMod;
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import net.minecraft.core.Holder;
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import net.minecraft.core.HolderGetter;
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import net.minecraft.core.registries.Registries;
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import net.minecraft.gametest.framework.GameTest;
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import net.minecraft.gametest.framework.GameTestHelper;
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import net.minecraft.resources.ResourceKey;
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import net.minecraft.server.level.ServerLevel;
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import net.minecraft.world.level.biome.Biome;
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import net.minecraft.world.level.biome.Biomes;
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import net.neoforged.neoforge.gametest.GameTestHolder;
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import net.neoforged.neoforge.gametest.PrefixGameTestTemplate;
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import javax.imageio.ImageIO;
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import java.awt.image.BufferedImage;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.util.EnumMap;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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/**
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* Automated world-map validation for the latitude biome system, run as a NeoForge
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* {@link GameTest} so it executes inside a real game server with the full biome registry.
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*
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* <p>Launch with {@code ./gradlew runGameTestServer}. The test samples a large grid through a
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* freshly built {@link LatitudeBiomeSource}, renders a PNG map, writes a distribution report and
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* asserts the climate invariants (frozen north, hot south, safe spawn, rare swamp). No manual
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* in-game testing required.</p>
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*/
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@GameTestHolder(CustomOreGenMod.MODID)
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@PrefixGameTestTemplate(false)
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public class LatitudeGameTest {
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private static final int RADIUS = 16000; // covers equator -> pole
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private static final int STEP = 80; // ~400x400 samples
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private static final long SEED = 0L;
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private static final Path OUT_DIR = Path.of("gametest-results", "latitude");
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private static final Map<ResourceKey<Biome>, Integer> COLORS = new HashMap<>();
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static {
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col(0xB6E388, Biomes.PLAINS, Biomes.SUNFLOWER_PLAINS, Biomes.FOREST, Biomes.BIRCH_FOREST,
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Biomes.FLOWER_FOREST, Biomes.MEADOW, Biomes.CHERRY_GROVE);
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col(0xC8E6FF, Biomes.SNOWY_PLAINS, Biomes.ICE_SPIKES, Biomes.SNOWY_TAIGA, Biomes.GROVE,
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Biomes.SNOWY_SLOPES, Biomes.JAGGED_PEAKS, Biomes.FROZEN_PEAKS, Biomes.FROZEN_OCEAN,
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Biomes.DEEP_FROZEN_OCEAN, Biomes.FROZEN_RIVER);
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col(0x8FB8D6, Biomes.TAIGA, Biomes.OLD_GROWTH_PINE_TAIGA, Biomes.OLD_GROWTH_SPRUCE_TAIGA,
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Biomes.WINDSWEPT_HILLS, Biomes.WINDSWEPT_FOREST, Biomes.WINDSWEPT_GRAVELLY_HILLS,
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Biomes.COLD_OCEAN, Biomes.DEEP_COLD_OCEAN);
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col(0x7CC576, Biomes.DARK_FOREST, Biomes.OLD_GROWTH_BIRCH_FOREST, Biomes.RIVER,
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Biomes.OCEAN, Biomes.DEEP_OCEAN);
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col(0xE0C068, Biomes.SAVANNA, Biomes.SAVANNA_PLATEAU, Biomes.WINDSWEPT_SAVANNA,
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Biomes.LUKEWARM_OCEAN, Biomes.DEEP_LUKEWARM_OCEAN);
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col(0xE0884C, Biomes.DESERT, Biomes.BADLANDS, Biomes.WOODED_BADLANDS, Biomes.ERODED_BADLANDS,
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Biomes.JUNGLE, Biomes.SPARSE_JUNGLE, Biomes.BAMBOO_JUNGLE, Biomes.WARM_OCEAN);
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col(0x5B7A3A, Biomes.SWAMP);
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col(0x3A5A3A, Biomes.MANGROVE_SWAMP);
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col(0x6B4E3A, Biomes.LUSH_CAVES, Biomes.DRIPSTONE_CAVES, Biomes.DEEP_DARK);
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}
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private static void col(int rgb, ResourceKey<Biome>... keys) {
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for (ResourceKey<Biome> k : keys) COLORS.put(k, rgb);
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}
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@GameTest(template = "empty_1x1", timeoutTicks = 600)
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public static void latitudeMap(GameTestHelper helper) {
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try {
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runLatitudeValidation(helper);
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helper.succeed();
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} catch (AssertionError | Exception e) {
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CustomOreGenMod.LOGGER.error("Latitude game test failed", e);
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helper.fail(e.getMessage());
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}
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}
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private static void runLatitudeValidation(GameTestHelper helper) throws Exception {
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ServerLevel level = helper.getLevel();
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HolderGetter<Biome> getter = level.registryAccess().lookupOrThrow(Registries.BIOME);
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LatitudeBiomeSource source = new LatitudeBiomeSource(SEED, getter);
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Files.createDirectories(OUT_DIR);
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int dim = (2 * RADIUS) / STEP + 1;
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BufferedImage img = new BufferedImage(dim, dim, BufferedImage.TYPE_INT_RGB);
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Map<ResourceKey<Biome>, Integer> global = new HashMap<>();
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Map<BiomeBand, Map<ResourceKey<Biome>, Integer>> perBand = new EnumMap<>(BiomeBand.class);
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for (BiomeBand b : BiomeBand.values()) perBand.put(b, new HashMap<>());
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for (int zi = 0; zi < dim; zi++) {
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for (int xi = 0; xi < dim; xi++) {
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int blockX = -RADIUS + xi * STEP;
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int blockZ = -RADIUS + zi * STEP;
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Holder<Biome> holder = source.getNoiseBiome(blockX >> 2, 64 >> 2, blockZ >> 2, null);
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ResourceKey<Biome> key = holder.unwrapKey().orElse(null);
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global.merge(key, 1, Integer::sum);
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perBand.get(BiomeBand.fromTemperature(blockZ / 16000.0)).merge(key, 1, Integer::sum);
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int rgb = key == null ? 0x888888 : COLORS.getOrDefault(key, 0x888888);
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img.setRGB(xi, dim - 1 - zi, rgb);
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}
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}
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ImageIO.write(img, "png", OUT_DIR.resolve("latitude_map.png").toFile());
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ResourceKey<Biome> spawnKey = source.getNoiseBiome(0, 64 >> 2, 0, null).unwrapKey().orElse(null);
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StringBuilder r = new StringBuilder();
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r.append("Latitude GameTest Report (seed=").append(SEED).append(")\n\n");
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r.append("Spawn @ (0,0): ").append(spawnKey).append("\n\n");
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int total = global.values().stream().mapToInt(Integer::intValue).sum();
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global.entrySet().stream()
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.sorted(Map.Entry.<ResourceKey<Biome>, Integer>comparingByValue().reversed())
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.forEach(e -> r.append(String.format(" %-45s %6.2f%%%n", e.getKey(), 100.0 * e.getValue() / total)));
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Files.writeString(OUT_DIR.resolve("latitude_report.txt"), r.toString());
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// ---- Assertions ----
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assertNotNull(spawnKey, "spawn biome resolved");
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assertTrue(isSafeSpawn(spawnKey), "spawn must be a safe biome, was " + spawnKey);
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double north = bandRatio(perBand.get(BiomeBand.FROZEN), frozenColdKeys());
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assertTrue(north > 60.0, "FROZEN band should be >60%% cold/frozen, was %.1f%%".formatted(north));
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double south = bandRatio(perBand.get(BiomeBand.HOT), hotWarmKeys());
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assertTrue(south > 60.0, "HOT band should be >60%% warm/hot, was %.1f%%".formatted(south));
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Map<ResourceKey<Biome>, Integer> temperate = perBand.get(BiomeBand.TEMPERATE);
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int temperateTotal = temperate.values().stream().mapToInt(Integer::intValue).sum();
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int temperateSwamp = temperate.getOrDefault(Biomes.SWAMP, 0);
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double swampRatio = 100.0 * temperateSwamp / temperateTotal;
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assertTrue(swampRatio < 15.0,
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"swamp must be <15%% of temperate band, was %.2f%%".formatted(swampRatio));
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// Log a one-line summary so it shows up in the game test output.
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CustomOreGenMod.LOGGER.info(String.format(
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"Latitude game test OK: spawn=%s | north=%.0f%% | south=%.0f%% | swamp=%.2f%%",
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spawnKey, north, south, swampRatio));
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}
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private static double bandRatio(Map<ResourceKey<Biome>, Integer> m, Set<ResourceKey<Biome>> expected) {
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int total = m.values().stream().mapToInt(Integer::intValue).sum();
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if (total == 0) return 0;
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int match = 0;
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for (ResourceKey<Biome> k : expected) match += m.getOrDefault(k, 0);
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return 100.0 * match / total;
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}
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private static Set<ResourceKey<Biome>> frozenColdKeys() {
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return new HashSet<>(List.of(Biomes.SNOWY_PLAINS, Biomes.ICE_SPIKES, Biomes.SNOWY_TAIGA, Biomes.GROVE,
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Biomes.SNOWY_SLOPES, Biomes.JAGGED_PEAKS, Biomes.FROZEN_PEAKS, Biomes.TAIGA,
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Biomes.OLD_GROWTH_PINE_TAIGA, Biomes.OLD_GROWTH_SPRUCE_TAIGA, Biomes.WINDSWEPT_HILLS,
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Biomes.WINDSWEPT_FOREST, Biomes.FROZEN_OCEAN, Biomes.DEEP_FROZEN_OCEAN,
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Biomes.COLD_OCEAN, Biomes.DEEP_COLD_OCEAN, Biomes.FROZEN_RIVER));
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}
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private static Set<ResourceKey<Biome>> hotWarmKeys() {
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return new HashSet<>(List.of(Biomes.DESERT, Biomes.BADLANDS, Biomes.WOODED_BADLANDS,
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Biomes.ERODED_BADLANDS, Biomes.JUNGLE, Biomes.SPARSE_JUNGLE, Biomes.BAMBOO_JUNGLE,
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Biomes.SAVANNA, Biomes.SAVANNA_PLATEAU, Biomes.WARM_OCEAN));
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}
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private static boolean isSafeSpawn(ResourceKey<Biome> key) {
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return Set.of(Biomes.PLAINS, Biomes.SUNFLOWER_PLAINS, Biomes.FOREST, Biomes.BIRCH_FOREST,
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Biomes.FLOWER_FOREST, Biomes.MEADOW, Biomes.CHERRY_GROVE).contains(key);
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}
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// Local assert helpers (no JUnit in the main classpath at runtime).
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private static void assertTrue(boolean condition, String msg) {
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if (!condition) throw new AssertionError(msg);
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}
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private static void assertNotNull(Object o, String msg) {
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if (o == null) throw new AssertionError(msg);
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}
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}
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