test: add tests for minecart movement along rail networks
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#include "testHarness.h"
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#include "vf/Minecart.h"
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using namespace vf;
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namespace {
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auto neverPowered = [](const Vec3i&) { return false; };
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auto alwaysPowered = [](const Vec3i&) { return true; };
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void railLine(World& world, int x0, int x1, int y, int z, Block kind) {
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for (int x = x0; x <= x1; ++x) world.setBlock(x, y, z, kind);
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}
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} // namespace
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VF_TEST(cartRollsAlongFlatTrackAndFrictionBringsItToRest) {
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World world;
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railLine(world, 0, 60, 0, 0, Block::Rail);
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ContainerStore store;
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Minecart cart = makeMinecart({5, 0, 0}, RailDir::East, CartKind::Empty);
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cart.speed = 0.3f;
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CartConfig config;
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tickMinecart(world, cart, config, neverPowered, store);
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CHECK(cart.speed < 0.3f);
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CHECK(cart.offset > 0.0f);
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for (int i = 0; i < 400; ++i) tickMinecart(world, cart, config, neverPowered, store);
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CHECK(!cart.derailed);
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CHECK(cart.railPos.x > 5);
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CHECK_NEAR(cart.speed, 0.0f, 1e-6f);
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}
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VF_TEST(poweredRailAcceleratesCartToMaxSpeed) {
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World world;
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railLine(world, 0, 300, 0, 0, Block::PoweredRail);
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ContainerStore store;
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Minecart cart = makeMinecart({5, 0, 0}, RailDir::East, CartKind::Empty);
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cart.speed = 0.05f;
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CartConfig config;
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tickMinecart(world, cart, config, alwaysPowered, store);
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CHECK(cart.speed > 0.05f);
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for (int i = 0; i < 30; ++i) tickMinecart(world, cart, config, alwaysPowered, store);
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CHECK_NEAR(cart.speed, config.maxSpeed, 1e-4f);
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CHECK(!cart.derailed);
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}
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VF_TEST(inactivePoweredRailBrakesTheCart) {
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World world;
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railLine(world, 0, 60, 0, 0, Block::PoweredRail);
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ContainerStore store;
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Minecart cart = makeMinecart({5, 0, 0}, RailDir::East, CartKind::Empty);
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cart.speed = 0.3f;
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CartConfig config;
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tickMinecart(world, cart, config, neverPowered, store);
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CHECK(cart.speed < 0.2f);
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}
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VF_TEST(gravityAcceleratesCartDownASlope) {
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World world;
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world.setBlock(0, 0, 0, Block::Rail);
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world.setBlock(-1, 0, 0, Block::Rail);
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world.setBlock(1, 1, 0, Block::Rail);
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ContainerStore store;
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Minecart cart = makeMinecart({0, 0, 0}, RailDir::West, CartKind::Empty);
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cart.speed = 0.0f;
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CartConfig config;
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tickMinecart(world, cart, config, neverPowered, store);
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CHECK(cart.speed > 0.04f);
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}
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VF_TEST(uphillDecelerationRollsTheCartBack) {
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World world;
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world.setBlock(0, 0, 0, Block::Rail);
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world.setBlock(-1, 0, 0, Block::Rail);
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world.setBlock(1, 1, 0, Block::Rail);
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ContainerStore store;
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Minecart cart = makeMinecart({0, 0, 0}, RailDir::East, CartKind::Empty);
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cart.speed = 0.03f;
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CartConfig config;
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tickMinecart(world, cart, config, neverPowered, store);
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CHECK(cart.moveDir == RailDir::West);
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CHECK(cart.speed > 0.0f);
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}
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VF_TEST(cartDerailsWhenTrackEnds) {
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World world;
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world.setBlock(0, 0, 0, Block::Rail);
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world.setBlock(1, 0, 0, Block::Rail);
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ContainerStore store;
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Minecart cart = makeMinecart({1, 0, 0}, RailDir::East, CartKind::Empty);
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cart.speed = 0.4f;
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CartConfig config;
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for (int i = 0; i < 12 && !cart.derailed; ++i)
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tickMinecart(world, cart, config, neverPowered, store);
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CHECK(cart.derailed);
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CHECK_NEAR(cart.speed, 0.0f, 1e-6f);
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}
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VF_TEST(hopperCartPullsFromContainerAboveOnCooldown) {
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World world;
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world.setBlock(5, 0, 0, Block::Rail);
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ContainerStore store;
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store.ensure({5, 1, 0}, 5).insert(ItemId::Stone, 3);
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Minecart cart = makeMinecart({5, 0, 0}, RailDir::East, CartKind::Hopper);
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cart.speed = 0.0f;
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CartConfig config;
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tickMinecart(world, cart, config, neverPowered, store);
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CHECK_EQ(cart.inventory.totalItems(), 1);
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for (int i = 0; i < 60; ++i) tickMinecart(world, cart, config, neverPowered, store);
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CHECK_EQ(cart.inventory.totalItems(), 3);
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CHECK_EQ(store.at({5, 1, 0})->totalItems(), 0);
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}
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VF_TEST(chestCartCarriesAnInventory) {
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Minecart cart = makeMinecart({0, 0, 0}, RailDir::East, CartKind::Chest);
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CHECK_EQ(cart.inventory.size(), chestCartSlots);
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cart.inventory.insert(ItemId::DiamondGem, 12);
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CHECK_EQ(cart.inventory.totalItems(), 12);
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}
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VF_TEST(cartWorldPositionTracksSubCellOffset) {
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Minecart cart = makeMinecart({5, 0, 0}, RailDir::East, CartKind::Empty);
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cart.offset = 0.5f;
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Vec3 pos = cartWorldPos(cart);
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CHECK_NEAR(pos.x, 6.0f, 1e-5f);
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CHECK_NEAR(pos.z, 0.5f, 1e-5f);
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}
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VF_TEST(headOnCartsBounceApart) {
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World world;
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railLine(world, -40, 40, 0, 0, Block::Rail);
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ContainerStore store;
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CartConfig config;
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std::vector<Minecart> carts = {
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makeMinecart({3, 0, 0}, RailDir::East, CartKind::Empty),
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makeMinecart({7, 0, 0}, RailDir::West, CartKind::Empty),
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};
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carts[0].speed = 0.3f;
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carts[1].speed = 0.3f;
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for (int i = 0; i < 40; ++i)
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stepMinecarts(world, carts, config, neverPowered, store);
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CHECK(carts[0].moveDir == RailDir::West);
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CHECK(carts[1].moveDir == RailDir::East);
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CHECK(carts[0].railPos.x < carts[1].railPos.x);
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CHECK(!carts[0].derailed);
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CHECK(!carts[1].derailed);
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}
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VF_TEST(movingCartHandsMomentumToStationaryCart) {
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World world;
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railLine(world, -40, 40, 0, 0, Block::Rail);
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ContainerStore store;
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CartConfig config;
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std::vector<Minecart> carts = {
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makeMinecart({0, 0, 0}, RailDir::East, CartKind::Empty),
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makeMinecart({5, 0, 0}, RailDir::East, CartKind::Empty),
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};
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carts[0].speed = 0.3f;
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carts[1].speed = 0.0f;
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for (int i = 0; i < 40; ++i)
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stepMinecarts(world, carts, config, neverPowered, store);
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CHECK(carts[1].speed > carts[0].speed);
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CHECK(carts[1].railPos.x > carts[0].railPos.x);
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CHECK(carts[0].speed < 0.05f);
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}
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VF_TEST(minecartSimulationIsDeterministic) {
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World world;
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railLine(world, 0, 300, 0, 0, Block::PoweredRail);
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ContainerStore storeA, storeB;
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Minecart a = makeMinecart({5, 0, 0}, RailDir::East, CartKind::Empty);
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Minecart b = makeMinecart({5, 0, 0}, RailDir::East, CartKind::Empty);
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a.speed = 0.1f;
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b.speed = 0.1f;
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CartConfig config;
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for (int i = 0; i < 50; ++i) {
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tickMinecart(world, a, config, alwaysPowered, storeA);
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tickMinecart(world, b, config, alwaysPowered, storeB);
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CHECK(a.railPos == b.railPos);
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CHECK(a.moveDir == b.moveDir);
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CHECK_NEAR(a.speed, b.speed, 1e-6f);
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CHECK_NEAR(a.offset, b.offset, 1e-6f);
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}
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}
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