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.junit.Assert.assertEquals;
  
  import java.util.Arrays;
  import java.util.List;
  import org.apache.beam.sdk.coders.Coder;
  import org.apache.beam.sdk.testing.CoderProperties;
  import org.apache.beam.sdk.transforms.Mean.CountSum;
  import org.apache.beam.sdk.transforms.Mean.CountSumCoder;
  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 Mean. */
  @RunWith(JUnit4.class)
  public class MeanTest {
  
    @Test
    public void testMeanGetNames() {
      assertEquals("Combine.globally(Mean)", Mean.globally().getName());
      assertEquals("Combine.perKey(Mean)", Mean.perKey().getName());
    }
  
    private static final Coder<CountSum<Number>> TEST_CODER = new CountSumCoder<>();
  
    private static final List<CountSum<Number>> TEST_VALUES =
        Arrays.asList(new CountSum<>(1, 5.7), new CountSum<>(42, 42.0), new CountSum<>(29, 2.2));
  
    @Test
    public void testCountSumCoderEncodeDecode() throws Exception {
      for (CountSum<Number> value : TEST_VALUES) {
        CoderProperties.coderDecodeEncodeEqual(TEST_CODER, value);
      }
    }
  
    @Test
    public void testCountSumCoderSerializable() throws Exception {
      CoderProperties.coderSerializable(TEST_CODER);
    }
  
    @Test
    public void testMeanFn() throws Exception {
      testCombineFn(Mean.of(), Lists.newArrayList(1, 2, 3, 4), 2.5);
    }
  }
  