Verify Method called throws Null Pointer exception.

Method to Test from presenter

` override

fun syncLocalOrders(syncOrders: SyncOrders) {
    if (syncOrders.orders.isNotEmpty()) {
        view.showProgressDialog("Syncing Successful Call's")
        repository.syncLocalOrder(syncOrders)
                .subscribe({
                    var syncMessage = if (it.failure.count() > 0) {
                        "Call Synced Failed"
                    } else {
                        "Call synced successfully."
                    }
                    view.hideProgressDialog()
                    getUnsuccessfulCallData(false, syncMessage) //Null Pointer Exception
                    updateDatabase(it)
                }, {
                    view.hideProgressDialog() // and enters here too after null pointer exception
                    view.showAlertDialog("Error", ErrorMessageFactory.createMessage(it))
                })
    } else {
        getUnsuccessfulCallData(true, "")
    }
}`

` @VisibleForTesting

internal fun getUnsuccessfulCallData(showDialog: Boolean, syncMessage: String) {
    repository.getUnsuccessfulCallData()
            .subscribe({
                if (it.noOrders.isNotEmpty()) {
                    syncUnsuccessfulCallData(it, syncMessage)
                } else {
                    view.hideProgressDialog()
                    if (showDialog) {
                        view.showAlertDialog("", "no orders to sync")
                    } else {
                        if (syncMessage.isNotEmpty())
                            view.showSnackBar(syncMessage)
                    }

                }

            }, {
                it.printStackTrace()
            })
}

`

` @Test

fun syncLocalOrders_OrderNotEmptySuccessTest() {
    val order = Order(
            outletId = 1,
            startDate = "Start Date",
            endDate = "End Date",
            syncLat = 9090.09009,
            syncLng = 909009.990,
            offRoute = 1,
            notes = "notes",
            remarks = "Remarks",
            totalPromotionDiscount = 9090.998,
            totalAmount = 90.90,
            inventory = null,
            promotionOrders = null
    )
    val listOfOrder = listOf(order, order)

    val syncOrder = SyncOrders(listOfOrder)
    val success = listOf(1, 2, 3, 4)
    val failure = listOf<Int>()
    val orderResponse = OrderResponse(success, failure)
    whenever(repository.syncLocalOrder(syncOrder)).thenReturn(Observable.just(orderResponse))

    presenter.syncLocalOrders(syncOrder)
    verify(view).showProgressDialog(anyString())
    verify(view).hideProgressDialog()
    verify(presenter, times(1)).getUnsuccessfulCallData(eq(false),  "Call synced successfully.")
    verify(presenter, times(1)).updateDatabase(orderResponse)

}`

The main issue here is whenever I try to run the test syncLocalOrders_OrderNotEmptySuccessTest(), the code enters to both subscribe and throwable of fun syncLocalOrders(syncOrders: SyncOrders) (this was got by keeping breakpoints.) And what I knew was the code enters to throwable after getting Null Pointer Exception on getUnsuccessfulCallData(false, syncMessage) and the test fails Saying something like view.hideProgressDialog() wanted 1 time but was 2 times. Can anybody tell me what am I doing wrong?

[bohsen]

Then try

verify(presenter).getUnsuccessfulCallData(eq(false), anyString())

There’s a limitation in Mockito-kotlin verifying non-null parameters - it’s mentioned in the wiki.

[nhaarman]

Your repository instance is mocked and thus will return null for all unstubbed method calls. Since you didn’t stub the updateUser function it returned null and the NPE is thrown.