This module helps with test cases for testing aggregate states, and command handlers.

Usage

After import the test support file, you should be able to have the module in your test files.

defmodule MyAggregateTest do
  use OnePiece.Commanded.TestSupport.CommandHandlerCase,
    aggregate: MyAggregate,
    # You can also pass `handler` if you are using Command Handler modules
    # handler: MyCommandHandler,
    async: true

  describe "my aggregate" do
    test "should do something" do
      assert_events(
        [%InitialEvent{}],
        %DoSomething{},
        [%SomethingHappened{}]
      )
    end

    test "the state" do
      assert_state(
        [%InitialEvent{}],
        %DoSomething{},
        %MyAggregate{}
      )
    end

    test "the error" do
      assert_error(
        [%InitialEvent{}],
        %DoSomething{},
        :already_exists
      )
    end
  end
end