public async Task When_There_Is_No_Message_In_The_Sql_Inbox_And_I_Check_Exists_Async()
        {
            Guid commandId = Guid.NewGuid();
            bool exists    = await _sqlInbox.ExistsAsync <MyCommand>(commandId, "some-key");

            exists.Should().BeFalse();
        }
        public async Task When_The_Message_Is_Already_In_The_Inbox_Async()
        {
            await _sqlInbox.AddAsync(_raisedCommand, _contextKey);

            _exception = await Catch.ExceptionAsync(() => _sqlInbox.AddAsync(_raisedCommand, _contextKey));

            //_should_succeed_even_if_the_message_is_a_duplicate
            _exception.Should().BeNull();
            var exists = await _sqlInbox.ExistsAsync <MyCommand>(_raisedCommand.Id, _contextKey);

            exists.Should().BeTrue();
        }