@Test public void shouldFailPurchaseWhenEmptyResponseIsReturned() throws Exception {

    shouldStartSetup_SuccessCase();
    Bundle empty = new Bundle();
    when(service.getBuyIntent(API_VERSION, Robolectric.application.getPackageName(), "sku", "inapp", "")).thenReturn(empty);
    helper.launchPurchaseFlow(mock(Activity.class), "sku", INAPP, 0, purchaseFinishedListener, "");
    verify(purchaseFinishedListener).onIabPurchaseFinished(
            new IabResult(IABHELPER_SEND_INTENT_FAILED),
            null);
}