public async Task StartTracking_Should_return_from_execution_When_geolocation_permission_is_not_validated()
{
_permissionValidator.ValidateGeolocationPermission().Returns(false);
_geolocator.IsListening.Returns(false);
await _trackerService.StartTracking();
await _geolocator.DidNotReceive().StartListeningAsync(Arg.Any <TimeSpan>(), Arg.Any <double>());
_geolocator.DidNotReceive().PositionChanged += Arg.Any <EventHandler <PositionEventArgs> >();
}