}));
    expectUnchanged();
  }

  @MapFeature.Require(SUPPORTS_REMOVE)
  @CollectionSize.Require(absent = ZERO)
  public void testMergePresentToNull() {
    assertNull(
        "Map.merge(present, value, functionReturningNull) should return null",
        getMap()
            .merge(
                k0(),
                v3(),
                (oldV, newV) -> {

    FreshValueGenerator generator = new FreshValueGenerator();
    assertValueAndTypeEquals(expected, generator.generateFresh(type));
    assertNull(generator.generateFresh(type));
  }

  private static void assertNotInstantiable(TypeToken<?> type) {
    assertNull(new FreshValueGenerator().generateFresh(type));
  }

  private static void assertValueAndTypeEquals(Object expected, Object actual) {

    assertThrows(NoSuchElementException.class, () -> navigableMap.firstKey());
  }

  @CollectionSize.Require(ZERO)
  public void testEmptyMapLast() {
    assertThrows(NoSuchElementException.class, () -> assertNull(navigableMap.lastKey()));
  }

  @CollectionSize.Require(ONE)
  public void testSingletonMapFirst() {
    assertEquals(a.getKey(), navigableMap.firstKey());
  }

  @CollectionSize.Require(ONE)

    if (chunk1 > 0) {
      write(out, data, 0, chunk1, singleByte);
      assertTrue(ByteSource.wrap(data).slice(0, chunk1).contentEquals(source));
    }
    File file = out.getFile();
    assertNull(file);

    // Write data to go over the threshold
    if (chunk2 > 0) {
      if (JAVA_IO_TMPDIR.value().equals("/sdcard")) {
        assertThrows(IOException.class, () -> write(out, data, chunk1, chunk2, singleByte));

      assertFalse(name, domain.isPublicSuffix());
      assertFalse(name, domain.hasPublicSuffix());
      assertFalse(name, domain.isUnderPublicSuffix());
      assertFalse(name, domain.isTopPrivateDomain());
      assertNull(domain.publicSuffix());
    }

    for (String name : NON_PS) {
      final InternetDomainName domain = InternetDomainName.from(name);
      assertFalse(name, domain.isPublicSuffix());

        assertEquals(exp, transformer.getFileName(url, Constants.UTF_8));
    }

    public void test_decodeUrl_null() throws Exception {
        final FessFileTransformer transformer = createInstance();
        assertNull(transformer.decodeUrlAsName(null, true));
    }

    public void test_getHost_ok() {
        String url, exp;
        final FessFileTransformer transformer = createInstance();

        url = "";

    assertEquals("bar", getOnlyElement(iterable, "bar"));
  }

  public void testGetOnlyElement_withDefault_empty_null() {
    Iterable<String> iterable = emptyList();
    assertNull(Iterables.<@Nullable String>getOnlyElement(iterable, null));
  }

  public void testGetOnlyElement_withDefault_multiple() {
    Iterable<String> iterable = asList("foo", "bar");

    String string = source.read();
    assertExpectedString(string);
  }

  public void testReadFirstLine() throws IOException {
    if (expectedLines.isEmpty()) {
      assertNull(source.readFirstLine());
    } else {
      assertEquals(expectedLines.get(0), source.readFirstLine());
    }
  }

  public void testReadLines_toList() throws IOException {

    assertEquals(1, threadLocalCount.get().intValue());
    otherThread.join(1000);
    assertEquals(Thread.State.TERMINATED, otherThread.getState());
    Throwable throwable = throwableFromOtherThread.get();
    assertNull(
        "Throwable from other thread: "
            + (throwable == null ? null : Throwables.getStackTraceAsString(throwable)),
        throwableFromOtherThread.get());
  }

    assertSame(toBeSupplied, objectSupplier.get()); // idempotent
  }

  public void testOfInstanceSuppliesNull() {
    Supplier<@Nullable Integer> nullSupplier = Suppliers.ofInstance(null);
    assertNull(nullSupplier.get());
  }

  @J2ktIncompatible
  @GwtIncompatible // Thread
  @SuppressWarnings("DoNotCall")
  public void testExpiringMemoizedSupplierThreadSafe() throws Throwable {