Unit testing to check that the accept was called when using RxBindings

AS 4.0.2
RxBindings 4.0.0

I have written a unit test for testing if the PublishRelay accept has been called that uses jakeWartons rxBindings

This is the snippet of code I am testing

private val checkStoresRelay: Relay<Unit> = PublishRelay.create<Unit>()

private fun onCheckStockTapped(view: View) {
    view.textViewCheckStock
        .clicks()
        .debounce(TIME_OUT, TimeUnit.MILLISECONDS)
        .subscribeBy(
            onNext = checkStoresRelay::accept,
            onError = { Timber.e(it, it.localizedMessage) }
        )
}

In the test class I am doing the following. The textViewCheckStock.performClick() will trigger and I check that the checkStoresRelay.accept(Unit) had been called.

But I am not sure about the availableDeliveryOptionsModel.checkStoresRelay.accept(Unit) As I don't think I should be calling this in the test. However, the test will fail if I remove this. Just wondering what would be the best way to test this?

@Test
fun `should check stores when checkStock is tapped`() {
    // Arrange
    val viewHolder = createViewHolder()
    availableDeliveryOptionsModel.bind(viewHolder)
    val actual = availableDeliveryOptionsModel.checkStoresRelay.test()

    // Act
    availableDeliveryOptionsModel.checkStoresRelay.accept(Unit)
    viewHolder.itemView.textViewCheckStock.performClick()

    // Assert
    actual.assertValue(Unit)
}

Many thanks for any suggestions,

from Unit testing to check that the accept was called when using RxBindings