public async Task SetAsBaseCurrency_ChangedAndNavigatedBack()
{
await _rateViewModel.Init();
bool called = false;
Messenger.Default.Register <BaseCurrencyChangedMessage>(this, (arg) => called = true);
var navigatorMock = MockRepository.GenerateMock <INavigator>();
navigatorMock.Stub(x => x.GoBackAsync()).Return(Task.CompletedTask);
SimpleIoc.Default.Register(() => navigatorMock);
await _rateViewModel.SetAsBaseCurrencyCommand.ExecuteAsync();
_settingsProvider.AssertWasCalled(x => x.SetValue("baseCurrency", "PLN"));
Assert.IsTrue(called);
navigatorMock.AssertWasCalled(x => x.GoBackAsync());
}
