content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.beam.runners.dataflow.worker.util;
  
  import org.apache.beam.runners.core.StateInternalsFactory;
  import org.apache.beam.runners.dataflow.worker.util.GroupAlsoByWindowProperties.GroupAlsoByWindowDoFnFactory;
  import org.apache.beam.sdk.transforms.windowing.BoundedWindow;
  import org.apache.beam.sdk.values.WindowingStrategy;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.ExpectedException;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /**
   * Unit tests for {@link BatchGroupAlsoByWindowViaIteratorsFn}.
   *
   * <p>Note the absence of tests for sessions, as merging window functions are not supported.
   */
  @RunWith(JUnit4.class)
  public class GroupAlsoByWindowViaIteratorsDoFnTest {
  
    @Rule public final transient ExpectedException thrown = ExpectedException.none();
  
    private class GABWViaIteratorsDoFnFactory<K, InputT>
        implements GroupAlsoByWindowDoFnFactory<K, InputT, Iterable<InputT>> {
      @Override
      public <W extends BoundedWindow>
          BatchGroupAlsoByWindowFn<K, InputT, Iterable<InputT>> forStrategy(
              WindowingStrategy<?, W> windowingStrategy,
              StateInternalsFactory<K> stateInternalsFactory) {
        return new BatchGroupAlsoByWindowViaIteratorsFn<K, InputT, W>(windowingStrategy);
      }
    }
  
    @Test
    public void testEmptyInputEmptyOutput() throws Exception {
      GroupAlsoByWindowProperties.emptyInputEmptyOutput(new GABWViaIteratorsDoFnFactory<>());
    }
  
    @Test
    public void testGroupsElementsIntoFixedWindows() throws Exception {
      GroupAlsoByWindowProperties.groupsElementsIntoFixedWindows(
          new GABWViaIteratorsDoFnFactory<String, String>());
    }
  
    @Test
    public void testGroupsElementsIntoSlidingWindows() throws Exception {
      GroupAlsoByWindowProperties.groupsElementsIntoSlidingWindowsWithMinTimestamp(
          new GABWViaIteratorsDoFnFactory<String, String>());
    }
  
    @Test
    public void testGroupsIntoOverlappingNonmergingWindows() throws Exception {
      GroupAlsoByWindowProperties.groupsIntoOverlappingNonmergingWindows(
          new GABWViaIteratorsDoFnFactory<String, String>());
    }
  
    @Test
    public void testGroupsElementsIntoFixedWindowsWithEndOfWindowTimestamp() throws Exception {
      GroupAlsoByWindowProperties.groupsElementsIntoFixedWindowsWithEndOfWindowTimestamp(
          new GABWViaIteratorsDoFnFactory<String, String>());
    }
  
    @Test
    public void testLatestTimestampNotSupported() throws Exception {
      thrown.expect(IllegalArgumentException.class);
      thrown.expectMessage("TimestampCombiner");
      thrown.expectMessage("not support");
  
      GroupAlsoByWindowProperties.groupsElementsIntoFixedWindowsWithLatestTimestamp(
          new GABWViaIteratorsDoFnFactory<String, String>());
    }
  
    @Test
    public void testMergingNotSupported() throws Exception {
      thrown.expect(IllegalArgumentException.class);
      thrown.expectMessage("merging");
      thrown.expectMessage("not support");
  
      GroupAlsoByWindowProperties.groupsElementsInMergedSessions(
          new GABWViaIteratorsDoFnFactory<String, String>());
    }
  }
  