src/test/java/io/mifos/core/lang/listening/TenantedEventListenerTest.java

/*
 * Copyright 2018 The Apache Software Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.mifos.core.lang.listening;

import org.junit.Assert;
import org.junit.Test;

import java.util.concurrent.TimeUnit;

/**
 * @author Myrle Krantz
 */
public class TenantedEventListenerTest {
  static class SomeState {
    boolean mutableBit = false;
  }

  @Test
  public void shouldWaitForEventOccurenceTrue() throws InterruptedException {
    final TenantedEventListener testSubject = new TenantedEventListener();
    final EventKey eventKey = new EventKey("shouldWaitForEventOccurenceTrue", "blah", "blah");
    final EventExpectation eventExpectation = testSubject.expect(eventKey);
    final SomeState someState = stateThatMutatesIn60MillisThenNotifiesOnEventKey(testSubject, eventKey);

    Assert.assertTrue(eventExpectation.waitForOccurrence(600, TimeUnit.MILLISECONDS));
    Assert.assertTrue(someState.mutableBit);
  }

  @Test
  public void shouldWaitForEventOccurenceFalse() throws InterruptedException {
    final TenantedEventListener testSubject = new TenantedEventListener();
    final EventKey eventKey = new EventKey("shouldWaitForEventOccurenceFalse", "blah", "blah");
    final EventExpectation eventExpectation = testSubject.expect(eventKey);
    final SomeState someState = stateThatMutatesIn60MillisThenNotifiesOnEventKey(testSubject, eventKey);

    Assert.assertFalse(eventExpectation.waitForOccurrence(6, TimeUnit.MILLISECONDS));
    Assert.assertFalse(someState.mutableBit); //Some potential for flakiness here, because this is timing dependent.
  }

  @Test
  public void shouldNotWaitForEventOccurence() throws InterruptedException {
    final TenantedEventListener testSubject = new TenantedEventListener();
    final EventKey eventKey = new EventKey("shouldNotWaitForEventOccurence", "blah", "blah");
    final EventExpectation eventExpectation = testSubject.expect(eventKey);
    final SomeState someState = stateThatMutatesIn60MillisThenNotifiesOnEventKey(testSubject, eventKey);

    testSubject.withdrawExpectation(eventExpectation);

    Assert.assertFalse(eventExpectation.waitForOccurrence(600, TimeUnit.MILLISECONDS));
    Assert.assertFalse(someState.mutableBit); //Some potential for flakiness here, because this is timing dependent.
  }

  private SomeState stateThatMutatesIn60MillisThenNotifiesOnEventKey(
      final TenantedEventListener testSubject,
      final EventKey eventKey) {
    final SomeState someState = new SomeState();
    new Thread(() -> {
      try {
        TimeUnit.MILLISECONDS.sleep(60);
        someState.mutableBit = true;
        testSubject.notify(eventKey);
      } catch (InterruptedException e) {
        e.printStackTrace();
      }
    }).start();
    return someState;
  }
}