checkArgument(!result.containsKey(entry.getKey()));
        result.put(entry.getKey(), entry.getValue());
      }
      return result;
    }
  }

  static class TestBiMap<K, V> extends TestMap<K, V> implements BiMap<K, V> {
    private final BiMap<K, V> delegate;

    public TestBiMap(BiMap<K, V> delegate, Object mutex) {
      super(delegate, mutex);
      this.delegate = delegate;
    }

    withIndex.close();

    assertThat(doubleStreamCloseCount.get()).isEqualTo(1);
  }

  public void testZip() {
    assertThat(Streams.zip(Stream.of("a", "b", "c"), Stream.of(1, 2, 3), (a, b) -> a + ":" + b))
        .containsExactly("a:1", "b:2", "c:3")
        .inOrder();
  }

  public void testZip_closeIsPropagated() {
    AtomicInteger lettersCloseCount = new AtomicInteger();

  protected <K, V> Map<K, V> create() {
    TestMap<K, V> inner = new TestMap<>(new HashMap<K, V>(), mutex);
    Map<K, V> outer = Synchronized.map(inner, mutex);
    return outer;
  }

  static class TestMap<K, V> extends ForwardingMap<K, V> implements Serializable {
    public final Object mutex;
    private Map<K, V> delegate;

    public TestMap(Map<K, V> delegate, Object mutex) {
      checkNotNull(mutex);

    Joiner j = Joiner.on("x").useForNull("y");
    try {
      j = j.useForNull("y");
      fail();
    } catch (UnsupportedOperationException expected) {
    }
  }

  public void testMap() {
    MapJoiner j = Joiner.on(';').withKeyValueSeparator(':');
    assertEquals("", j.join(ImmutableMap.of()));
    assertEquals(":", j.join(ImmutableMap.of("", "")));

    // Test compat address.
    testIp = (Inet6Address) InetAddresses.forString("::1.2.3.4");
    assertTrue(InetAddresses.hasEmbeddedIPv4ClientAddress(testIp));
    InetAddress ipv4 = InetAddresses.forString("1.2.3.4");
    assertEquals(ipv4, InetAddresses.getEmbeddedIPv4ClientAddress(testIp));

    // Test 6to4 address.
    testIp = (Inet6Address) InetAddresses.forString("2002:0102:0304::1");

        checkArgument(!result.containsKey(entry.getKey()));
        result.put(entry.getKey(), entry.getValue());
      }
      return result;
    }
  }

  static class TestBiMap<K, V> extends TestMap<K, V> implements BiMap<K, V> {
    private final BiMap<K, V> delegate;

    public TestBiMap(BiMap<K, V> delegate, Object mutex) {
      super(delegate, mutex);
      this.delegate = delegate;
    }

    assertFreshInstance(new TypeToken<Collection<String>>() {});
  }

  public void testIterable() {
    assertFreshInstance(new TypeToken<Iterable<String>>() {});
  }

  public void testMap() {
    assertFreshInstance(new TypeToken<Map<String, ?>>() {});
  }

  public void testHashMap() {
    assertFreshInstance(new TypeToken<HashMap<String, ?>>() {});
  }

  public void testLinkedHashMap() {

  }

  public void testRemove() {
    TestMap map = new TestMap();
    map.put("foo", 1);
    assertFalse(map.remove("foo", 2));
    assertFalse(map.remove("bar", 1));
    assertEquals(Integer.valueOf(1), map.get("foo"));
    assertTrue(map.remove("foo", 1));
    assertTrue(map.isEmpty());
  }

  public void testReplace() {
    TestMap map = new TestMap();
    map.put("foo", 1);

import junit.framework.TestCase;

/** Tests for {@code CollectSpliterators}. */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public class CollectSpliteratorsTest extends TestCase {
  public void testMap() {
    SpliteratorTester.of(
            () ->
                CollectSpliterators.map(
                    Arrays.spliterator(new String[] {"a", "b", "c", "d", "e"}), Ascii::toUpperCase))

    assertFreshInstance(new TypeToken<Collection<String>>() {});
  }

  public void testIterable() {
    assertFreshInstance(new TypeToken<Iterable<String>>() {});
  }

  public void testMap() {
    assertFreshInstance(new TypeToken<Map<String, ?>>() {});
  }

  public void testHashMap() {
    assertFreshInstance(new TypeToken<HashMap<String, ?>>() {});
  }

  public void testLinkedHashMap() {