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   * 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,
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   * See the License for the specific language governing permissions and
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  package org.apache.beam.runners.samza;
  
  import static org.apache.beam.runners.samza.SamzaPipelineOptionsValidator.validateBundlingRelatedOptions;
  import static org.apache.samza.config.JobConfig.JOB_CONTAINER_THREAD_POOL_SIZE;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  import java.util.Collections;
  import java.util.Map;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableMap;
  import org.junit.Test;
  
  /** Test for {@link SamzaPipelineOptionsValidator}. */
  public class SamzaPipelineOptionsValidatorTest {
  
    @Test(expected = IllegalArgumentException.class)
    public void testBundleEnabledInMultiThreadedModeThrowsException() {
      SamzaPipelineOptions mockOptions = mock(SamzaPipelineOptions.class);
      Map<String, String> config = ImmutableMap.of(JOB_CONTAINER_THREAD_POOL_SIZE, "10");
  
      when(mockOptions.getMaxBundleSize()).thenReturn(2L);
      when(mockOptions.getConfigOverride()).thenReturn(config);
      validateBundlingRelatedOptions(mockOptions);
    }
  
    @Test
    public void testBundleEnabledInSingleThreadedMode() {
      SamzaPipelineOptions mockOptions = mock(SamzaPipelineOptions.class);
      when(mockOptions.getMaxBundleSize()).thenReturn(2L);
  
      try {
        Map<String, String> config = ImmutableMap.of(JOB_CONTAINER_THREAD_POOL_SIZE, "1");
        when(mockOptions.getConfigOverride()).thenReturn(config);
        validateBundlingRelatedOptions(mockOptions);
  
        // In the absence of configuration make sure it is treated as single threaded mode.
        when(mockOptions.getConfigOverride()).thenReturn(Collections.emptyMap());
        validateBundlingRelatedOptions(mockOptions);
      } catch (Exception e) {
        throw new AssertionError("Bundle size > 1 should be supported in single threaded mode");
      }
    }
  }
  