testDeleteCommandRemovesItemFromCollection.swift

func testDeleteCommandRemovesItemFromCollection() {
    let itemsObserver = testScheduler.createObserver([Book].self)

    viewModel.items.bind(to: itemsObserver)
        .disposed(by: disposeBag)

    testScheduler.createHotObservable(
            [Recorded.next(100, IndexPath(row: 0, section: 0))]
        )
        .bind(to: viewModel.deleteCommand)
        .disposed(by: disposeBag)

    testScheduler.start()

    XCTAssertRecordedElements(
        itemsObserver.events,
        [
            [Book(title: "Book 1"), Book(title: "Book 2"), Book(title: "Book 3")],
            [Book(title: "Book 2"), Book(title: "Book 3")]
        ]
    )
}