runners/core-java/src/test/java/org/apache/beam/runners/core/InMemoryMultimapSideInputViewTest.java

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 * "License"); you may not use this file except in compliance
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 *     http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.beam.runners.core;

import static org.junit.Assert.assertEquals;

import org.apache.beam.sdk.coders.ByteArrayCoder;
import org.apache.beam.sdk.coders.StringUtf8Coder;
import org.apache.beam.sdk.transforms.Materializations.MultimapView;
import org.apache.beam.sdk.values.KV;
import org.apache.beam.vendor.guava.v20_0.com.google.common.collect.ImmutableList;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Tests for {@link InMemoryMultimapSideInputView}. */
@RunWith(JUnit4.class)
public class InMemoryMultimapSideInputViewTest {
  @Test
  public void testStructuralKeyEquality() {
    MultimapView<byte[], Integer> view =
        InMemoryMultimapSideInputView.fromIterable(
            ByteArrayCoder.of(),
            ImmutableList.of(KV.of(new byte[] {0x00}, 0), KV.of(new byte[] {0x01}, 1)));
    assertEquals(view.get(new byte[] {0x00}), ImmutableList.of(0));
    assertEquals(view.get(new byte[] {0x01}), ImmutableList.of(1));
    assertEquals(view.get(new byte[] {0x02}), ImmutableList.of());
  }

  @Test
  public void testValueGrouping() {
    MultimapView<String, String> view =
        InMemoryMultimapSideInputView.fromIterable(
            StringUtf8Coder.of(),
            ImmutableList.of(KV.of("A", "a1"), KV.of("A", "a2"), KV.of("B", "b1")));
    assertEquals(view.get("A"), ImmutableList.of("a1", "a2"));
    assertEquals(view.get("B"), ImmutableList.of("b1"));
    assertEquals(view.get("C"), ImmutableList.of());
  }
}