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.testing.CombineFnTester.testCombineFn;
  import static org.apache.beam.sdk.transforms.display.DisplayDataMatchers.hasDisplayItem;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.junit.Assert.assertEquals;
  
  import org.apache.beam.sdk.transforms.display.DisplayData;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Lists;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for Max. */
  @RunWith(JUnit4.class)
  public class MaxTest {
    @Test
    public void testMaxGetNames() {
      assertEquals("Combine.globally(MaxInteger)", Max.integersGlobally().getName());
      assertEquals("Combine.globally(MaxDouble)", Max.doublesGlobally().getName());
      assertEquals("Combine.globally(MaxLong)", Max.longsGlobally().getName());
      assertEquals("Combine.perKey(MaxInteger)", Max.integersPerKey().getName());
      assertEquals("Combine.perKey(MaxDouble)", Max.doublesPerKey().getName());
      assertEquals("Combine.perKey(MaxLong)", Max.longsPerKey().getName());
    }
  
    @Test
    public void testMaxIntegerFn() {
      testCombineFn(Max.ofIntegers(), Lists.newArrayList(1, 2, 3, 4), 4);
    }
  
    @Test
    public void testMaxLongFn() {
      testCombineFn(Max.ofLongs(), Lists.newArrayList(1L, 2L, 3L, 4L), 4L);
    }
  
    @Test
    public void testMaxDoubleFn() {
      testCombineFn(Max.ofDoubles(), Lists.newArrayList(1.0, 2.0, 3.0, 4.0), 4.0);
    }
  
    @Test
    public void testMaxDoubleFnInfinity() {
      testCombineFn(
          Max.ofDoubles(),
          Lists.newArrayList(Double.NEGATIVE_INFINITY, 2.0, 3.0, Double.POSITIVE_INFINITY),
          Double.POSITIVE_INFINITY);
    }
  
    @Test
    public void testMaxDoubleFnNan() {
      testCombineFn(
          Max.ofDoubles(),
          Lists.newArrayList(Double.NaN, 2.0, 3.0, Double.POSITIVE_INFINITY),
          Double.NaN);
    }
  
    @Test
    public void testDisplayData() {
      Top.Natural<Integer> comparer = new Top.Natural<>();
  
      Combine.Globally<Integer, Integer> max = Max.globally(comparer);
      assertThat(DisplayData.from(max), hasDisplayItem("comparer", comparer.getClass()));
    }
  }
  