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.sdk.transforms;
  
  import static org.apache.beam.sdk.TestUtils.NO_LINES;
  import static org.junit.Assert.assertEquals;
  
  import java.util.Arrays;
  import java.util.List;
  import org.apache.beam.sdk.coders.StringUtf8Coder;
  import org.apache.beam.sdk.testing.NeedsRunner;
  import org.apache.beam.sdk.testing.PAssert;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.sdk.transforms.windowing.FixedWindows;
  import org.apache.beam.sdk.transforms.windowing.Window;
  import org.apache.beam.sdk.values.KV;
  import org.apache.beam.sdk.values.PCollection;
  import org.joda.time.Duration;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  import org.junit.rules.ExpectedException;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for Count. */
  @RunWith(JUnit4.class)
  public class CountTest {
    static final String[] WORDS_ARRAY =
        new String[] {"hi", "there", "hi", "hi", "sue", "bob", "hi", "sue", "", "", "ZOW", "bob", ""};
  
    static final List<String> WORDS = Arrays.asList(WORDS_ARRAY);
  
    @Rule public TestPipeline p = TestPipeline.create();
  
    @Rule public ExpectedException exceptionRule = ExpectedException.none();
  
    @Test
    @Category(NeedsRunner.class)
    @SuppressWarnings("unchecked")
    public void testCountPerElementBasic() {
      PCollection<String> input = p.apply(Create.of(WORDS));
  
      PCollection<KV<String, Long>> output = input.apply(Count.perElement());
  
      PAssert.that(output)
          .containsInAnyOrder(
              KV.of("hi", 4L),
              KV.of("there", 1L),
              KV.of("sue", 2L),
              KV.of("bob", 2L),
              KV.of("", 3L),
              KV.of("ZOW", 1L));
      p.run();
    }
  
    @Test
    @Category(NeedsRunner.class)
    @SuppressWarnings("unchecked")
    public void testCountPerElementEmpty() {
      PCollection<String> input = p.apply(Create.of(NO_LINES).withCoder(StringUtf8Coder.of()));
  
      PCollection<KV<String, Long>> output = input.apply(Count.perElement());
  
      PAssert.that(output).empty();
      p.run();
    }
  
    @Test
    @Category(NeedsRunner.class)
    public void testCountGloballyBasic() {
      PCollection<String> input = p.apply(Create.of(WORDS));
  
      PCollection<Long> output = input.apply(Count.globally());
  
      PAssert.that(output).containsInAnyOrder(13L);
      p.run();
    }
  
    @Test
    @Category(NeedsRunner.class)
    public void testCountGloballyEmpty() {
      PCollection<String> input = p.apply(Create.of(NO_LINES).withCoder(StringUtf8Coder.of()));
  
      PCollection<Long> output = input.apply(Count.globally());
  
      PAssert.that(output).containsInAnyOrder(0L);
      p.run();
    }
  
    @Test
    public void testCountGetName() {
      assertEquals("Count.PerElement", Count.perElement().getName());
      assertEquals("Combine.globally(Count)", Count.globally().getName());
    }
  
    @Test
    public void testGlobalWindowErrorMessageShows() {
      PCollection<String> input = p.apply(Create.of(NO_LINES).withCoder(StringUtf8Coder.of()));
      PCollection<String> windowed =
          input.apply(Window.into(FixedWindows.of(Duration.standardDays(1))));
  
      String expected = Count.combineFn().getIncompatibleGlobalWindowErrorMessage();
      exceptionRule.expect(IllegalStateException.class);
      exceptionRule.expectMessage(expected);
      windowed.apply(Count.globally());
    }
  }
  