event-sourcing/event-store-api/src/test/scala/org/apache/james/eventsourcing/eventstore/EventStoreContract.scala

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package org.apache.james.eventsourcing.eventstore

import org.apache.james.eventsourcing.{EventId, TestAggregateId, TestEvent}
import org.assertj.core.api.Assertions.{assertThat, assertThatCode, assertThatThrownBy}
import org.junit.jupiter.api.Test
import reactor.core.scala.publisher.SMono

object EventStoreContract {
  val AGGREGATE_1 = TestAggregateId(1)
  val AGGREGATE_2 = TestAggregateId(2)
}

trait EventStoreContract {

  @Test
  def getEventsOfAggregateShouldThrowOnNullAggregateId(testee: EventStore) : Unit =
    assertThatThrownBy(() => SMono(testee.getEventsOfAggregate(null)).block())
      .isInstanceOf(classOf[NullPointerException])

  @Test
  def appendShouldThrowWhenEventFromSeveralAggregates(testee: EventStore) : Unit = {
    val event1 = TestEvent(EventId.first, EventStoreContract.AGGREGATE_1, "first")
    val event2 = TestEvent(event1.eventId.next, EventStoreContract.AGGREGATE_2, "second")
    assertThatThrownBy(() => SMono(testee.appendAll(event1, event2)).block())
      .isInstanceOf(classOf[IllegalArgumentException])
  }

  @Test
  def appendShouldDoNothingOnEmptyEventList(testee: EventStore) : Unit =
    assertThatCode(() => SMono(testee.appendAll()).block())
      .doesNotThrowAnyException()

  @Test
  def appendShouldThrowWhenTryingToRewriteHistory(testee: EventStore) : Unit = {
    val event1 = TestEvent(EventId.first, EventStoreContract.AGGREGATE_1, "first")
    SMono(testee.append(event1)).block()
    val event2 = TestEvent(EventId.first, EventStoreContract.AGGREGATE_1, "second")
    assertThatThrownBy(
      () => SMono(testee.append(event2)).block())
      .isInstanceOf(classOf[EventStoreFailedException])
  }

  @Test
  def getEventsOfAggregateShouldReturnEmptyHistoryWhenUnknown(testee: EventStore) : Unit =
    assertThat(SMono(testee.getEventsOfAggregate(EventStoreContract.AGGREGATE_1)).block())
      .isEqualTo(History.empty)

  @Test
  def getEventsOfAggregateShouldReturnAppendedEvent(testee: EventStore) : Unit = {
    val event = TestEvent(EventId.first, EventStoreContract.AGGREGATE_1, "first")
    SMono(testee.append(event)).block()
    assertThat(SMono(testee.getEventsOfAggregate(EventStoreContract.AGGREGATE_1)).block())
      .isEqualTo(History.of(event))
  }

  @Test
  def getEventsOfAggregateShouldReturnAppendedEvents(testee: EventStore) : Unit = {
    val event1 = TestEvent(EventId.first, EventStoreContract.AGGREGATE_1, "first")
    val event2 = TestEvent(event1.eventId.next, EventStoreContract.AGGREGATE_1, "second")
    SMono(testee.append(event1)).block()
    SMono(testee.append(event2)).block()
    assertThat(SMono(testee.getEventsOfAggregate(EventStoreContract.AGGREGATE_1)).block())
      .isEqualTo(History.of(event1, event2))
  }

  @Test
  def removeShouldDeleteAssignEntry(testee: EventStore): Unit = {
    val event1 = TestEvent(EventId.first, EventStoreContract.AGGREGATE_1, "first")
    val event2 = TestEvent(event1.eventId.next, EventStoreContract.AGGREGATE_2, "second")
    SMono(testee.append(event1)).block()
    SMono(testee.append(event2)).block()

    SMono(testee.remove(EventStoreContract.AGGREGATE_1)).block()

    assertThat(SMono(testee.getEventsOfAggregate(EventStoreContract.AGGREGATE_1)).block())
      .isEqualTo(History.empty)
    assertThat(SMono(testee.getEventsOfAggregate(EventStoreContract.AGGREGATE_2)).block())
      .isEqualTo(History.of(event2))
  }
}