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Use Commanded to build your own Elixir applications following the CQRS/ES pattern.
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test/event_store_adapter/snapshot_test.exs
defmodule Commanded.EventStore.Adapter.SnapshotTest do
use Commanded.StorageCase
alias Commanded.EventStore
alias Commanded.EventStore.SnapshotData
defmodule(BankAccountOpened, do: defstruct([:account_number, :initial_balance]))
describe "record a snapshot" do
test "should record the snapshot" do
snapshot = build_snapshot_data(100)
assert :ok = EventStore.record_snapshot(snapshot)
end
end
describe "read a snapshot" do
test "should read the snapshot" do
snapshot1 = build_snapshot_data(100)
snapshot2 = build_snapshot_data(101)
snapshot3 = build_snapshot_data(102)
assert :ok == EventStore.record_snapshot(snapshot1)
assert :ok == EventStore.record_snapshot(snapshot2)
assert :ok == EventStore.record_snapshot(snapshot3)
{:ok, snapshot} = EventStore.read_snapshot(snapshot3.source_uuid)
assert snapshot_timestamps_within_delta?(snapshot, snapshot3, 60)
end
test "should error when snapshot does not exist" do
{:error, :snapshot_not_found} = EventStore.read_snapshot("doesnotexist")
end
end
describe "delete a snapshot" do
test "should delete the snapshot" do
snapshot1 = build_snapshot_data(100)
assert :ok == EventStore.record_snapshot(snapshot1)
{:ok, snapshot} = EventStore.read_snapshot(snapshot1.source_uuid)
assert snapshot_timestamps_within_delta?(snapshot, snapshot1, 60)
assert :ok == EventStore.delete_snapshot(snapshot1.source_uuid)
assert {:error, :snapshot_not_found} == EventStore.read_snapshot(snapshot1.source_uuid)
end
end
defp build_snapshot_data(account_number) do
%SnapshotData{
source_uuid: UUID.uuid4(),
source_version: account_number,
source_type: "Elixir.Commanded.EventStore.Adapter.SnapshotTest.BankAccountOpened",
data: %BankAccountOpened{account_number: account_number, initial_balance: 1_000},
metadata: nil,
created_at: DateTime.to_naive(DateTime.utc_now())
}
end
defp snapshot_timestamps_within_delta?(snapshot, other_snapshot, delta_seconds) do
NaiveDateTime.diff(snapshot.created_at, other_snapshot.created_at, :second) < delta_seconds
end
end