CreationReducerTest.kt

@Test
fun should_reduceItemsCollection_when_CreateItemAction_and_empty_collection() {
    val createItemAction = CreateItemAction(
        localId = LOCAL_ID,
        text = TEXT,
        favorite = FAVORITE,
        color = COLOR,
        position = POSITION)
    
    val itemsReduced = CreationReducer.reduceItemsCollection(
        action = createItemAction,
        currentItems = emptyList())

    assertThat(itemsReduced, iz(not(emptyList())))
    assertThat(itemsReduced.count(), iz(1))
    assertThat(itemsReduced, iz(listOf(
        Item(localId = LOCAL_ID,
             text = TEXT, favorite = FAVORITE, color = COLOR,
             position = POSITION))))
}