/*
 * 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;

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.v26_0_jre.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());
  }
}