memoized

val system1 = memoized { mock<System<TestState>>() }
    val system2 = memoized { mock<System<TestState>>() }
    val entityManager = memoized { mock<EntityManager>() }
    val stateManager = memoized { mock<StateManager<TestState>>() }

    subject {
        World(entityManager(), stateManager(), TestState.State1, listOf(system1(), system2()))
    }

val system1 by memoized { mock<System<TestState>>() }
    val system2 by memoized { mock<System<TestState>>() }
    val entityManager by memoized { mock<EntityManager>() }
    val stateManager by memoized { mock<StateManager<TestState>>() }

    subject {
        World(entityManager, stateManager, TestState.State1, listOf(system1, system2))
    }

describe

it

private val items = arrayOf(1, 2, 3, 4)

abstract class CollectionSpek<T : Any>(private val collection: Collection<T>) : Spek({

    describe("requesting the size") {
        it("$collection should have size ${items.size}"){
            assertThat(collection.size).isEqualTo(items.size)
        }
    }

})

class SetCollectionSpek : CollectionSpek<Int>(setOf(*items))

class ListCollectionSpek : CollectionSpek<Int>(items.asList())