public async Task UnlinkAndDeleteAsync()
{
var mock = new Mock <ITimelineService>();
await TimelineEvent.UnlinkAndDeleteAsync(mock.Object, "ID1", "ID2");
mock.Verify(m => m.PutJsonAsync("TimelineEvent/Delete", It.IsAny <object>()));
mock.Verify(m => m.PutJsonAsync("Timeline/UnlinkEvent", It.IsAny <object>()));
}