public async Task GetAllByKey()
{
await _connectionMapper.Add(Guid.Parse("c906dff3-ef28-4a83-a96c-9598cc174978"), 0, "666");
await _connectionMapper.Add(Guid.Parse("c906dff3-ef28-4a83-a96c-9598cc174978"), 1, "666");
var subscriptions = await _connectionMapper.GetAllByKey(Guid.Parse("c906dff3-ef28-4a83-a96c-9598cc174978"));
Assert.Equal(2, subscriptions.Count);
}