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Use Commanded to build your own Elixir applications following the CQRS/ES pattern.
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Files
test/aggregates/multi_test.exs
defmodule Commanded.Aggregate.MultiTest do
use Commanded.StorageCase
import Commanded.Enumerable
alias Commanded.EventStore
alias Commanded.Aggregate.Multi
alias Commanded.Aggregate.Multi.BankAccount
alias Commanded.Aggregate.Multi.BankAccount.Commands.{OpenAccount,WithdrawMoney}
alias Commanded.Aggregate.Multi.BankAccount.Events.{BankAccountOpened,MoneyWithdrawn}
defmodule MultiBankRouter do
use Commanded.Commands.Router
alias Commanded.Aggregate.Multi.BankAccount
alias Commanded.Aggregate.Multi.BankAccount.Commands.{OpenAccount,WithdrawMoney}
dispatch [OpenAccount,WithdrawMoney],
to: BankAccount, identity: :account_number
end
test "should return `Commanded.Aggregate.Multi` from command" do
account_number = UUID.uuid4()
account = BankAccount.apply(%BankAccount{}, %BankAccountOpened{account_number: account_number, balance: 1_000})
assert %Multi{} = multi = BankAccount.execute(account, %WithdrawMoney{account_number: account_number, amount: 100})
assert {account, events} = Multi.run(multi)
assert account == %BankAccount{
account_number: account_number,
balance: 900,
state: :active,
}
assert events == [
%MoneyWithdrawn{account_number: account_number, amount: 100, balance: 900},
]
end
test "should return errors encountered by `Commanded.Aggregate.Multi`" do
account_number = UUID.uuid4()
account = BankAccount.apply(%BankAccount{}, %BankAccountOpened{account_number: account_number, balance: 1_000})
assert %Multi{} = multi = BankAccount.execute(account, %WithdrawMoney{account_number: account_number, amount: 1_100})
assert {:error, :insufficient_funds_available} = Multi.run(multi)
end
test "should execute command using `Commanded.Aggregate.Multi` and return events" do
account_number = UUID.uuid4()
assert :ok = MultiBankRouter.dispatch(%OpenAccount{account_number: account_number, initial_balance: 1_000})
assert :ok = MultiBankRouter.dispatch(%WithdrawMoney{account_number: account_number, amount: 250})
recorded_events = EventStore.stream_forward(account_number, 0) |> Enum.to_list()
assert pluck(recorded_events, :data) == [
%BankAccountOpened{account_number: account_number, balance: 1_000},
%MoneyWithdrawn{account_number: account_number, amount: 250, balance: 750},
]
end
test "should execute command using `Commanded.Aggregate.Multi` and return any error" do
account_number = UUID.uuid4()
assert :ok = MultiBankRouter.dispatch(%OpenAccount{account_number: account_number, initial_balance: 1_000})
assert {:error, :insufficient_funds_available} = MultiBankRouter.dispatch(%WithdrawMoney{account_number: account_number, amount: 1_100})
recorded_events = EventStore.stream_forward(account_number, 0) |> Enum.to_list()
assert pluck(recorded_events, :data) == [
%BankAccountOpened{account_number: account_number, balance: 1_000},
]
end
end