In my experience, using of mocking frameworks for testing of Async calls is
not so good and tests are becoming un-readable at some point of time. In our
app we are using Command Pattern to send different requests
(Action/Response) and here is our helper class that we are using for
testing:
public class FakeRpcService implements RpcServiceAsync {
public Action<?> lastAction;
public AsyncCallback<?> lastCallback;
public <T extends Response> void execute(Action<T> action,
AsyncCallback<T> async) {
lastAction = action;
lastCallback = async;
}
public <T> T lastAction() {
return (T) lastAction;
}
public void responsesWith(Response response) {
// SMELL private members of simple object are referencing template
members?
((AsyncCallback<Response>) lastCallback).onSuccess(response);
}
public void failsWith(RuntimeException e) {
((AsyncCallback<Response>) lastCallback).onFailure(e);
}
}
so our tests now are looking like:
@Test
public void exportSelectedInvoices() {
List<InvoiceDto> invoices =
Lists.newArrayList(createInvoice("1",PaymentType.CASH));
// filter button was clicked
presenter.onReportRequested();
service.responsesWith(new GetInvoicesPeriodReportResponse(invoices));
presenter.onExportSelectedInvoices(new HashSet<InvoiceDto>());
GenerateAjurExportAction action = service.lastAction();
assertThat("the one selected invoice was not sent for
export?",action.getInvoices(), is(equalTo(invoices)));
service.responsesWith(new GenerateAjurExportResponse("test test"));
assertThat("export response was not
displayed?",display.exportResponse,is(equalTo("test test")));
}
Hope this will help you figure out what's the best choice for you.
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