let accountShouldCreateUser =
    ftestCaseAsync "account should create user" $ async {
      let source = ContractSource.read "../../../build" "FileSyncContract"
      let password = "password"

      /// personal stuff
      let name = "karsten"
      let! personalAddress = Web3().Personal.NewAccount.SendRequestAsync(password)
      let personalAccount = ManagedAccount(personalAddress, password)
      let personalWeb3 = Web3 personalAccount
      let! receipt = Eth.prefundAddress personalAddress /// eth.coinbase giving me some money
      let! balance = Web3().Eth.GetBalance.SendRequestAsync(personalAddress)
      printfn "address: %A has: %A" personalAddress balance.Value

      /// admin stuff
      let adminAddress = "0x12890d2cce102216644c59dae5baed380d84830c"
      let adminAccount = ManagedAccount(adminAddress, password)
      let adminWeb3 = Web3 adminAccount

      let! receipt =
        adminWeb3.Eth.DeployContract.SendRequestAndWaitForReceiptAsync(
          source.Abi,
          source.Bin,
          adminAddress,
          HexBigInteger(BigInteger((1000000))),
          null)

      printfn "contract: %A" receipt.ContractAddress

      let contract = personalWeb3.Eth.GetContract(source.Abi, receipt.ContractAddress)
      let userEvent = contract.GetEvent("User")
      let createFunc = contract.GetFunction("createUser")
      let! receipt =
        createFunc.SendTransactionAndWaitForReceiptAsync(
          personalAddress,
          HexBigInteger(Numerics.BigInteger(4700000)),
          null,
          null,
          name)

      printfn "created user in: %A" receipt.TransactionHash

      let userEvents =
        userEvent.DecodeAllEventsForEvent<FileSync.UserEvent> receipt.Logs

      for ev in userEvents do
        printfn "user name: %A address: %A" ev.Event.Name ev.Event.Address
    }