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package coffee.liz.ecs
import kotlin.reflect.KClass
import kotlin.test.*
// Test systems for circular dependency test
class CircularSystemA : System {
override val dependencies: Set<KClass<out System>>
get() = setOf(CircularSystemB::class)
override fun update(world: World, deltaTime: Float) {}
}
class CircularSystemB : System {
override val dependencies: Set<KClass<out System>>
get() = setOf(CircularSystemA::class)
override fun update(world: World, deltaTime: Float) {}
}
class DAGWorldTest {
@Test
fun `can create entities with unique ids`() {
val world = DAGWorld(emptyList())
val entity1 = world.createEntity()
val entity2 = world.createEntity()
assertNotEquals(entity1.id, entity2.id)
}
@Test
fun `can destroy entity`() {
val world = DAGWorld(emptyList())
val entity = world.createEntity()
entity.add(Position(10f, 20f))
world.removeEntity(entity)
val results = world.query<Position>()
assertFalse(results.contains(entity))
}
@Test
fun `query returns entities with matching components`() {
val world = DAGWorld(emptyList())
val entity1 = world.createEntity().add(Position(10f, 20f))
val entity2 = world.createEntity().add(Position(30f, 40f))
val entity3 = world.createEntity().add(Velocity(1f, 2f))
world.update(0f) // Trigger cache update
val results = world.query<Position>()
assertEquals(2, results.size)
assertTrue(results.contains(entity1))
assertTrue(results.contains(entity2))
assertFalse(results.contains(entity3))
}
@Test
fun `query with multiple components returns intersection`() {
val world = DAGWorld(emptyList())
val entity1 = world.createEntity()
.add(Position(10f, 20f))
.add(Velocity(1f, 2f))
val entity2 = world.createEntity()
.add(Position(30f, 40f))
val entity3 = world.createEntity()
.add(Velocity(3f, 4f))
world.update(0f) // Trigger cache update
val results = world.query<Position, Velocity>()
assertEquals(1, results.size)
assertTrue(results.contains(entity1))
}
@Test
fun `systems execute in dependency order`() {
val executionOrder = mutableListOf<String>()
val systemA = object : System {
override fun update(world: World, deltaTime: Float) {
executionOrder.add("A")
}
}
val systemB = object : System {
override val dependencies = setOf(systemA::class)
override fun update(world: World, deltaTime: Float) {
executionOrder.add("B")
}
}
val systemC = object : System {
override val dependencies = setOf(systemB::class)
override fun update(world: World, deltaTime: Float) {
executionOrder.add("C")
}
}
val world = DAGWorld(listOf(systemC, systemA, systemB))
world.update(0f)
assertEquals(listOf("A", "B", "C"), executionOrder)
}
@Test
fun `systems with no dependencies can execute in any order`() {
val executionOrder = mutableListOf<String>()
val systemA = object : System {
override fun update(world: World, deltaTime: Float) {
executionOrder.add("A")
}
}
val systemB = object : System {
override fun update(world: World, deltaTime: Float) {
executionOrder.add("B")
}
}
val world = DAGWorld(listOf(systemA, systemB))
world.update(0f)
assertEquals(2, executionOrder.size)
assertTrue(executionOrder.contains("A"))
assertTrue(executionOrder.contains("B"))
}
@Test
fun `circular dependency throws exception`() {
val systemA = CircularSystemA()
val systemB = CircularSystemB()
assertFailsWith<IllegalArgumentException> {
DAGWorld(listOf(systemA, systemB))
}
}
@Test
fun `system receives correct deltaTime`() {
var receivedDelta = 0f
val system = object : System {
override fun update(world: World, deltaTime: Float) {
receivedDelta = deltaTime
}
}
val world = DAGWorld(listOf(system))
world.update(0.016f)
assertEquals(0.016f, receivedDelta)
}
@Test
fun `systems can query entities during update`() {
var queriedEntities: Set<Entity>? = null
val system = object : System {
override fun update(world: World, deltaTime: Float) {
queriedEntities = world.query<Position>()
}
}
val world = DAGWorld(listOf(system))
val entity = world.createEntity().add(Position(10f, 20f))
world.update(0f)
assertNotNull(queriedEntities)
assertEquals(1, queriedEntities!!.size)
assertTrue(queriedEntities!!.contains(entity))
}
@Test
fun `component cache updates after entity changes`() {
val world = DAGWorld(emptyList())
val entity = world.createEntity()
world.update(0f)
assertEquals(0, world.query<Position>().size)
entity.add(Position(10f, 20f))
world.update(0f)
assertEquals(1, world.query<Position>().size)
entity.remove<Position>()
world.update(0f)
assertEquals(0, world.query<Position>().size)
}
@Test
fun `diamond dependency resolves correctly`() {
val executionOrder = mutableListOf<String>()
// A
// / \
// B C
// \ /
// D
val systemA = object : System {
override fun update(world: World, deltaTime: Float) {
executionOrder.add("A")
}
}
val systemB = object : System {
override val dependencies = setOf(systemA::class)
override fun update(world: World, deltaTime: Float) {
executionOrder.add("B")
}
}
val systemC = object : System {
override val dependencies = setOf(systemA::class)
override fun update(world: World, deltaTime: Float) {
executionOrder.add("C")
}
}
val systemD = object : System {
override val dependencies = setOf(systemB::class, systemC::class)
override fun update(world: World, deltaTime: Float) {
executionOrder.add("D")
}
}
val world = DAGWorld(listOf(systemD, systemC, systemB, systemA))
world.update(0f)
// A must come first, D must come last, B and C in between
assertEquals("A", executionOrder.first())
assertEquals("D", executionOrder.last())
assertTrue(executionOrder.indexOf("B") < executionOrder.indexOf("D"))
assertTrue(executionOrder.indexOf("C") < executionOrder.indexOf("D"))
}
}
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