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   * Licensed to the Apache Software Foundation (ASF) under one
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   * 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
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  package org.apache.beam.runners.samza.util;
  
  import static org.junit.Assert.assertEquals;
  
  import java.io.Serializable;
  import java.util.Objects;
  import org.apache.beam.sdk.Pipeline;
  import org.apache.beam.sdk.transforms.Create;
  import org.apache.beam.sdk.transforms.Filter;
  import org.apache.beam.sdk.transforms.GroupByKey;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.util.construction.PipelineTranslation;
  import org.apache.beam.sdk.util.construction.graph.ExecutableStage;
  import org.apache.beam.sdk.util.construction.graph.GreedyPipelineFuser;
  import org.apache.beam.sdk.values.KV;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.PDone;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Iterables;
  import org.junit.Test;
  
  public class DoFnUtilsTest implements Serializable {
    private final Pipeline pipeline = Pipeline.create();
  
    @Test
    public void testExecutableStageWithoutOutput() {
      pipeline.apply(Create.of(KV.of(1L, "1")));
  
      assertEquals("[Create.Values-]", DoFnUtils.toStepName(getOnlyExecutableStage(pipeline)));
    }
  
    @Test
    public void testExecutableStageWithCustomizedName() {
      pipeline.apply("MyCreateOf", Create.of(KV.of(1L, "1")));
      assertEquals("[MyCreateOf-]", DoFnUtils.toStepName(getOnlyExecutableStage(pipeline)));
    }
  
    @Test
    public void testExecutableStageWithOutput() {
      pipeline
          .apply("MyCreateOf", Create.of(KV.of(1L, "1")))
          .apply("MyFilterBy", Filter.by(Objects::nonNull))
          .apply(GroupByKey.create());
  
      assertEquals("[MyCreateOf-MyFilterBy]", DoFnUtils.toStepName(getOnlyExecutableStage(pipeline)));
    }
  
    @Test
    public void testExecutableStageWithPDone() {
      pipeline
          .apply("MyCreateOf", Create.of("1"))
          .apply(
              "PDoneTransform",
              new PTransform<PCollection<String>, PDone>() {
                @Override
                public PDone expand(PCollection<String> input) {
                  return PDone.in(pipeline);
                }
              });
  
      assertEquals("[MyCreateOf-]", DoFnUtils.toStepName(getOnlyExecutableStage(pipeline)));
    }
  
    private static ExecutableStage getOnlyExecutableStage(Pipeline p) {
      return Iterables.getOnlyElement(
          GreedyPipelineFuser.fuse(PipelineTranslation.toProto(p)).getFusedStages());
    }
  }
  