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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,
   * 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.runners.core.metrics;
  
  import static junit.framework.TestCase.assertEquals;
  import static org.apache.beam.runners.core.metrics.MonitoringInfoEncodings.decodeInt64Counter;
  import static org.junit.Assert.assertNull;
  import static org.junit.Assert.assertTrue;
  
  import org.apache.beam.model.pipeline.v1.MetricsApi.MonitoringInfo;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableMap;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link SimpleMonitoringInfoBuilder}. */
  @RunWith(JUnit4.class)
  public class SimpleMonitoringInfoBuilderTest {
  
    @Test
    public void testReturnsNullIfSpecRequirementsNotMet() {
      SimpleMonitoringInfoBuilder builder = new SimpleMonitoringInfoBuilder();
      builder.setUrn(MonitoringInfoConstants.Urns.ELEMENT_COUNT);
      assertNull(builder.build());
  
      builder.setInt64SumValue(1);
      assertNull(builder.build());
    }
  
    @Test
    public void testReturnsExpectedMonitoringInfo() throws Exception {
      SimpleMonitoringInfoBuilder builder = new SimpleMonitoringInfoBuilder();
      builder.setUrn(MonitoringInfoConstants.Urns.ELEMENT_COUNT);
  
      builder.setInt64SumValue(1);
      builder.setLabel(MonitoringInfoConstants.Labels.PCOLLECTION, "myPcollection");
      // Pass now that the spec is fully met.
      MonitoringInfo monitoringInfo = builder.build();
      assertTrue(monitoringInfo != null);
      assertEquals(
          "myPcollection",
          monitoringInfo.getLabelsOrDefault(MonitoringInfoConstants.Labels.PCOLLECTION, null));
      assertEquals(MonitoringInfoConstants.Urns.ELEMENT_COUNT, monitoringInfo.getUrn());
      assertEquals(MonitoringInfoConstants.TypeUrns.SUM_INT64_TYPE, monitoringInfo.getType());
      assertEquals(1L, decodeInt64Counter(monitoringInfo.getPayload()));
      assertEquals(
          "myPcollection",
          monitoringInfo.getLabelsMap().get(MonitoringInfoConstants.Labels.PCOLLECTION));
    }
  
    @Test
    public void testUserDistribution() throws Exception {
      SimpleMonitoringInfoBuilder builder = new SimpleMonitoringInfoBuilder();
      builder.setUrn(MonitoringInfoConstants.Urns.USER_DISTRIBUTION_INT64);
      builder.setLabel(MonitoringInfoConstants.Labels.NAME, "myName");
      builder.setLabels(
          ImmutableMap.of(
              MonitoringInfoConstants.Labels.NAMESPACE,
              "myNamespace",
              MonitoringInfoConstants.Labels.PTRANSFORM,
              "myStep"));
      assertNull(builder.build());
  
      builder.setInt64DistributionValue(DistributionData.create(10, 2, 1, 9));
      // Pass now that the spec is fully met.
      MonitoringInfo monitoringInfo = builder.build();
      assertTrue(monitoringInfo != null);
      assertEquals(MonitoringInfoConstants.Urns.USER_DISTRIBUTION_INT64, monitoringInfo.getUrn());
      assertEquals(
          "myName", monitoringInfo.getLabelsOrDefault(MonitoringInfoConstants.Labels.NAME, ""));
      assertEquals(
          "myNamespace",
          monitoringInfo.getLabelsOrDefault(MonitoringInfoConstants.Labels.NAMESPACE, ""));
      assertEquals(
          MonitoringInfoConstants.TypeUrns.DISTRIBUTION_INT64_TYPE, monitoringInfo.getType());
      DistributionData data =
          MonitoringInfoEncodings.decodeInt64Distribution(monitoringInfo.getPayload());
      assertEquals(10L, data.sum());
      assertEquals(2L, data.count());
      assertEquals(9L, data.max());
      assertEquals(1L, data.min());
    }
  }
  