public async void ImportAsync_ShouldComplementExistingLocation()
        {
            // Arrange
            SetUp();
            _locationServiceProxy.GetAllLocationsAsync()
            .Returns(_ =>
            {
                var tcs = new TaskCompletionSource <IEnumerable <Location> >();
                tcs.SetResult(new List <Location> {
                    _locationToImport
                });
                return(tcs.Task);
            });
            _snapshotServiceProxy.GetSnapshotsByLocationIdAsync(Arg.Any <int>())
            .Returns(_ =>
            {
                var tcs = new TaskCompletionSource <IEnumerable <LocationSnapshot> >();
                tcs.SetResult(new List <LocationSnapshot> {
                    _snapshotsToImport[0]
                });
                return(tcs.Task);
            });

            // Act
            var sit = new LocationDataImporter(_dataServiceFactory);
            await sit.ImportAsync(new List <Location> {
                _locationToImport
            }, new CancellationTokenSource().Token);

            // Assert
            await _locationServiceProxy.DidNotReceive().AddLocationAsync(_locationToImport);

            await _snapshotServiceProxy.DidNotReceive().AddSnapshotAsync(_snapshotsToImport[0]);

            await _snapshotServiceProxy.Received().AddSnapshotAsync(_snapshotsToImport[1]);

            await _pictureServiceProxy.DidNotReceive().SaveSnapshotContentAsync(_snapshotsToImport[0], _pictureData);

            await _pictureServiceProxy.Received().SaveSnapshotContentAsync(_snapshotsToImport[1], _pictureData);
        }