test: add tests for mob AI state machine for wandering and targeting
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dualfroz committed
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#include "testHarness.h"
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#include "vf/Mob.h"
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#include <cmath>
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using namespace vf;
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namespace {
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World openField(int x0 = -60, int z0 = -60, int x1 = 60, int z1 = 60) {
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World world;
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for (int x = x0; x <= x1; ++x)
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for (int z = z0; z <= z1; ++z)
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world.setBlock(x, 0, z, Block::Stone);
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return world;
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}
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World sealedRoom() {
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World world;
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for (int x = 0; x <= 4; ++x) {
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for (int z = 0; z <= 4; ++z) {
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for (int y = 0; y <= 4; ++y) {
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bool shell = x == 0 || x == 4 || z == 0 || z == 4 || y == 0 || y == 4;
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if (shell) world.setBlock(x, y, z, Block::Stone);
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}
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}
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}
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return world;
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}
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float horizontalDistance(const Vec3& a, const Vec3& b) {
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float dx = a.x - b.x, dz = a.z - b.z;
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return std::sqrt(dx * dx + dz * dz);
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}
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} // namespace
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VF_TEST(isHostileClassifiesEachSpecies) {
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CHECK(!isHostile(Species::Sheep));
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CHECK(!isHostile(Species::Cow));
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CHECK(!isHostile(Species::Pig));
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CHECK(isHostile(Species::Zombie));
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CHECK(isHostile(Species::Skeleton));
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CHECK(isHostile(Species::Creeper));
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}
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VF_TEST(spawnCreatureAdoptsSpeciesStats) {
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Creature creature = spawnCreature(Species::Cow, {3.0f, 1.0f, 3.0f}, 42);
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const SpeciesStats& stats = speciesStats(Species::Cow);
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CHECK_NEAR(creature.health, stats.maxHealth, 1e-6f);
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CHECK_NEAR(creature.body.width, stats.width, 1e-6f);
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CHECK_NEAR(creature.body.height, stats.height, 1e-6f);
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CHECK(creature.alive);
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CHECK(creature.state == CreatureState::Idle);
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}
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VF_TEST(passiveWandersWhenNoThreatIsNearby) {
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World world = openField();
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Creature creature = spawnCreature(Species::Sheep, {5.0f, 1.0f, 5.0f}, 7);
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CreatureConfig config;
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Vec3 farThreat{200.0f, 1.0f, 200.0f};
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updateCreature(world, creature, farThreat, false, config, 1.0f / 20.0f);
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CHECK(creature.state == CreatureState::Wander);
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}
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VF_TEST(passiveFleesAndGainsDistanceFromNearbyThreat) {
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World world = openField();
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Creature creature = spawnCreature(Species::Sheep, {5.0f, 1.0f, 5.0f}, 11);
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CreatureConfig config;
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Vec3 threat{7.0f, 1.0f, 5.0f}; // 2 blocks away, inside the 8-block alert radius
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float startDist = horizontalDistance(creature.body.position, threat);
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for (int i = 0; i < 120; ++i) updateCreature(world, creature, threat, true, config, 1.0f / 20.0f);
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float endDist = horizontalDistance(creature.body.position, threat);
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CHECK(creature.state == CreatureState::Flee);
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CHECK(endDist > startDist);
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}
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VF_TEST(hostileWandersWhenThreatIsFar) {
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World world = openField();
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Creature creature = spawnCreature(Species::Zombie, {5.0f, 1.0f, 5.0f}, 3);
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CreatureConfig config;
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Vec3 farThreat{500.0f, 1.0f, 500.0f};
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updateCreature(world, creature, farThreat, true, config, 1.0f / 20.0f);
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CHECK(creature.state == CreatureState::Wander);
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}
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VF_TEST(hostileChasesAndClosesDistanceOnReachableThreat) {
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World world = openField();
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Creature creature = spawnCreature(Species::Zombie, {5.0f, 1.0f, 5.0f}, 5);
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CreatureConfig config;
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Vec3 threat{11.0f, 1.0f, 5.0f}; // within the 16-block alert radius, open ground
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float startDist = horizontalDistance(creature.body.position, threat);
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bool sawChase = false;
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for (int i = 0; i < 150; ++i) {
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updateCreature(world, creature, threat, true, config, 1.0f / 20.0f);
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if (creature.state == CreatureState::Chase) sawChase = true;
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}
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float endDist = horizontalDistance(creature.body.position, threat);
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CHECK(sawChase);
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CHECK(endDist < startDist);
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}
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VF_TEST(hostileEntersAttackStateWithinRange) {
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World world = openField();
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Creature creature = spawnCreature(Species::Zombie, {5.0f, 1.0f, 5.0f}, 9);
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CreatureConfig config;
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Vec3 threat{5.5f, 1.0f, 5.0f}; // 0.5 blocks away, inside the 1.4 attack range
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updateCreature(world, creature, threat, true, config, 1.0f / 20.0f);
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CHECK(creature.state == CreatureState::Attack);
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}
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VF_TEST(hysteresisKeepsChasingInsideDisengageBandThenGivesUp) {
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World world = openField();
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Creature creature = spawnCreature(Species::Zombie, {5.0f, 1.0f, 5.0f}, 13);
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creature.state = CreatureState::Chase;
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CreatureConfig config;
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Vec3 inBand{5.0f + 18.0f, 1.0f, 5.0f}; // between alert (16) and disengage (20)
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updateCreature(world, creature, inBand, true, config, 1.0f / 20.0f);
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CHECK(creature.state == CreatureState::Chase);
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creature.state = CreatureState::Chase;
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Vec3 farOut{5.0f + 30.0f, 1.0f, 5.0f}; // beyond disengage radius
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updateCreature(world, creature, farOut, true, config, 1.0f / 20.0f);
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CHECK(creature.state == CreatureState::Wander);
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}
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VF_TEST(damageCreatureTracksHealthAndDeath) {
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Creature creature = spawnCreature(Species::Pig, {0.0f, 1.0f, 0.0f}, 21);
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float maxHealth = creature.health;
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bool died = damageCreature(creature, maxHealth * 0.5f);
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CHECK(!died);
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CHECK(creature.alive);
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CHECK_NEAR(creature.health, maxHealth * 0.5f, 1e-3f);
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died = damageCreature(creature, maxHealth);
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CHECK(died);
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CHECK(!creature.alive);
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CHECK_EQ(creature.health, 0.0f);
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}
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VF_TEST(creatureAttackEntersCooldownThenRecovers) {
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World world = openField();
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Creature creature = spawnCreature(Species::Zombie, {5.0f, 1.0f, 5.0f}, 17);
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Vec3 threat{5.5f, 1.0f, 5.0f};
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CreatureConfig config;
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updateCreature(world, creature, threat, true, config, 1.0f / 20.0f);
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CHECK(creature.state == CreatureState::Attack);
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CHECK(creatureCanAttack(creature, threat));
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creatureAttack(creature);
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CHECK(!creatureCanAttack(creature, threat));
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float cooldown = speciesStats(Species::Zombie).attackCooldown;
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for (float t = 0.0f; t < cooldown + 0.5f; t += 1.0f / 20.0f)
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updateCreature(world, creature, threat, true, config, 1.0f / 20.0f);
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CHECK(creatureCanAttack(creature, threat));
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}
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VF_TEST(dropsForMatchesSpeciesTheme) {
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auto sheepDrops = dropsFor(Species::Sheep);
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CHECK_EQ(sheepDrops.size(), static_cast<std::size_t>(1));
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CHECK(sheepDrops[0].item == ItemId::RawMutton);
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auto creeperDrops = dropsFor(Species::Creeper);
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CHECK(creeperDrops[0].item == ItemId::Gunpowder);
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}
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VF_TEST(rollDropsIsDeterministicForTheSameSeed) {
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uint32_t seedA = 999u;
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uint32_t seedB = 999u;
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std::vector<ItemSlot> a = rollDrops(Species::Cow, seedA);
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std::vector<ItemSlot> b = rollDrops(Species::Cow, seedB);
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CHECK(a.size() == b.size());
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for (std::size_t i = 0; i < a.size(); ++i) {
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CHECK(a[i].item == b[i].item);
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CHECK_EQ(a[i].count, b[i].count);
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}
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CHECK_EQ(seedA, seedB); // rng advanced identically
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}
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VF_TEST(mobSpawnLightLevelIsHighOutsideAndDarkInsideASealedRoom) {
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World open = openField();
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int openLight = mobSpawnLightLevel(open, Vec3i{5, 1, 5});
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CHECK_EQ(openLight, 15);
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World room = sealedRoom();
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int roomLight = mobSpawnLightLevel(room, Vec3i{2, 1, 2});
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CHECK_EQ(roomLight, 0);
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}
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VF_TEST(canSpawnAtRespectsPopulationCap) {
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World world = openField();
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Vec3i cell{5, 1, 5};
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Vec3 player{5.0f, 1.0f, 25.0f}; // 20 blocks away, inside default range
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SpawnConfig config;
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config.maxPerArea = 3;
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CHECK(canSpawnAt(world, cell, Species::Sheep, Biome::Plains, player, 2, config));
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CHECK(!canSpawnAt(world, cell, Species::Sheep, Biome::Plains, player, 3, config));
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}
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VF_TEST(canSpawnAtRespectsBiomeRestrictions) {
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World world = openField();
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Vec3i cell{5, 1, 5};
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Vec3 player{5.0f, 1.0f, 25.0f};
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CHECK(canSpawnAt(world, cell, Species::Sheep, Biome::Plains, player, 0));
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CHECK(!canSpawnAt(world, cell, Species::Sheep, Biome::Ocean, player, 0));
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CHECK(speciesAllowsBiome(Species::Creeper, Biome::Forest));
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CHECK(!speciesAllowsBiome(Species::Creeper, Biome::Ocean));
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CHECK(!speciesAllowsBiome(Species::Creeper, Biome::Beach));
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CHECK(speciesAllowsBiome(Species::Zombie, Biome::Desert));
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CHECK(!speciesAllowsBiome(Species::Zombie, Biome::Ocean));
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}
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VF_TEST(canSpawnAtRespectsLightThresholds) {
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World room = sealedRoom();
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Vec3i darkCell{2, 1, 2};
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Vec3 farPlayer{2.0f, 1.0f, 22.0f}; // horizontal distance ~20, inside range
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CHECK(canSpawnAt(room, darkCell, Species::Zombie, Biome::Forest, farPlayer, 0));
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World lit = openField();
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Vec3i brightCell{5, 1, 5};
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CHECK(!canSpawnAt(lit, brightCell, Species::Zombie, Biome::Forest, farPlayer, 0));
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}
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VF_TEST(canSpawnAtRespectsPlayerDistanceWindow) {
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World world = openField();
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Vec3i cell{5, 1, 5};
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SpawnConfig config;
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Vec3 tooClose{5.0f, 1.0f, 6.0f};
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CHECK(!canSpawnAt(world, cell, Species::Sheep, Biome::Plains, tooClose, 0, config));
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Vec3 tooFar{5.0f, 1.0f, 200.0f};
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CHECK(!canSpawnAt(world, cell, Species::Sheep, Biome::Plains, tooFar, 0, config));
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Vec3 justRight{5.0f, 1.0f, 25.0f};
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CHECK(canSpawnAt(world, cell, Species::Sheep, Biome::Plains, justRight, 0, config));
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}
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VF_TEST(trySpawnPicksOnlyAmongValidCandidatesDeterministically) {
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World world = openField();
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Vec3i cell{5, 1, 5};
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Vec3 player{5.0f, 1.0f, 25.0f}; // daylight rules out hostiles (light 15 > their max of 7)
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uint32_t rngA = 2026u;
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uint32_t rngB = 2026u;
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SpawnAttempt a = trySpawn(world, cell, Biome::Plains, player, 0, rngA);
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SpawnAttempt b = trySpawn(world, cell, Biome::Plains, player, 0, rngB);
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CHECK(a.spawned);
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CHECK(a.species == b.species);
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CHECK(!isHostile(a.species));
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}
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VF_TEST(trySpawnFindsNoCandidateWhenAreaIsFull) {
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World world = openField();
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Vec3i cell{5, 1, 5};
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Vec3 player{5.0f, 1.0f, 25.0f};
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SpawnConfig config;
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config.maxPerArea = 0;
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uint32_t rng = 1u;
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SpawnAttempt attempt = trySpawn(world, cell, Biome::Plains, player, 0, rng, config);
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CHECK(!attempt.spawned);
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}
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VF_TEST(advanceSpawnCycleFiresOncePerIntervalAndCatchesUpOnce) {
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SpawnCycle cycle;
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cycle.interval = 1.0f;
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int fires = 0;
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for (int i = 0; i < 25; ++i)
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if (advanceSpawnCycle(cycle, 0.1f)) ++fires;
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CHECK_EQ(fires, 2); // fires at t=1.0 and t=2.0 across 2.5s of ticking
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SpawnCycle burst;
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burst.interval = 1.0f;
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CHECK(advanceSpawnCycle(burst, 10.0f)); // huge dt: only one attempt fires this call
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CHECK_NEAR(burst.timer, 9.0f, 1e-4f); // the rest of the backlog is kept, not dropped
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int extraFires = 0;
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for (int i = 0; i < 15; ++i)
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if (advanceSpawnCycle(burst, 0.0f)) ++extraFires;
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CHECK_EQ(extraFires, 9); // backlog drains at one interval per subsequent call
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}
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