public async Task AddAndFetchAsync()
{
UserEntity?fetched = await _kvStore.GetAsync <UserEntity>(_userEntity1.Guid).ConfigureAwait(false);
Assert.True(fetched == null);
await _kvStore.AddAsync(_userEntity1, "xx").ConfigureAwait(false);
UserEntity?fetchedAgain = await _kvStore.GetAsync <UserEntity>(_userEntity1.Guid).ConfigureAwait(false);
Assert.Equal <UserEntity>(_userEntity1, fetchedAgain !, new UserEntityComparer());
}
