ArrayListMultimap<@Nullable String, Integer> input = ArrayListMultimap.create();
    input.put(null, 1);
    try {
      ImmutableListMultimap.copyOf((ArrayListMultimap<String, Integer>) input);
      fail();
    } catch (NullPointerException expected) {
    }
  }

  public void testCopyOfNullValue() {
    ArrayListMultimap<String, @Nullable Integer> input = ArrayListMultimap.create();

    ArrayListMultimap<@Nullable String, Integer> input = ArrayListMultimap.create();
    input.put(null, 1);
    try {
      ImmutableListMultimap.copyOf((ArrayListMultimap<String, Integer>) input);
      fail();
    } catch (NullPointerException expected) {
    }
  }

  public void testCopyOfNullValue() {
    ArrayListMultimap<String, @Nullable Integer> input = ArrayListMultimap.create();

    return generateArrayListMultimap(key, value);
  }

  @Generates
  static <K, V> ArrayListMultimap<K, V> generateArrayListMultimap(
      @Nullable K key, @Nullable V value) {
    ArrayListMultimap<K, V> multimap = ArrayListMultimap.create();
    multimap.put(key, value);
    return multimap;
  }

  @Generates

    checkUnmodifiableMultimap(
        ArrayListMultimap.<@Nullable String, @Nullable Integer>create(), true);
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testSerializingUnmodifiableArrayListMultimap() {
    Multimap<String, Integer> unmodifiable =
        prepareUnmodifiableTests(ArrayListMultimap.<String, Integer>create(), true, null, null);

    return generateArrayListMultimap(key, value);
  }

  @Generates
  static <K, V> ArrayListMultimap<K, V> generateArrayListMultimap(
      @Nullable K key, @Nullable V value) {
    ArrayListMultimap<K, V> multimap = ArrayListMultimap.create();
    multimap.put(key, value);
    return multimap;
  }

  @Generates

import static junit.framework.TestCase.assertTrue;
import static junit.framework.TestCase.fail;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.Iterators;
import com.google.common.collect.LinkedHashMultiset;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.collect.Multimap;

                            ArrayListMultimap.<String, String>create());
                    for (Entry<String, String> entry : entries) {
                      multimap.put(entry.getKey(), entry.getValue());
                    }
                    return multimap;
                  }
                })
            .named("synchronized ArrayListMultimap")
            .withFeatures(

import static junit.framework.TestCase.assertTrue;
import static junit.framework.TestCase.fail;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.Iterators;
import com.google.common.collect.LinkedHashMultiset;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.collect.Multimap;

 * {@code Map<K, Collection<V>>} in the first place).
 *
 * <h3>Example</h3>
 *
 * <p>The following code:
 *
 * <pre>{@code
 * ListMultimap<String, String> multimap = ArrayListMultimap.create();
 * for (President pres : US_PRESIDENTS_IN_ORDER) {
 *   multimap.put(pres.firstName(), pres.lastName());
 * }
 * for (String firstName : multimap.keySet()) {

    assertEquals(multimap, input);
    assertEquals(input, multimap);
  }

  public void testCopyOfWithDuplicates() {
    ArrayListMultimap<Object, Object> input = ArrayListMultimap.create();
    input.put("foo", 1);
    input.put("bar", 2);
    input.put("foo", 3);
    input.put("foo", 1);
    ImmutableSetMultimap<Object, Object> copy = ImmutableSetMultimap.copyOf(input);