try {
      J.join(ITERABLE_NULL);
      fail();
    } catch (NullPointerException expected) {
    }
    try {
      J.join(ITERABLE_1_NULL_2);
      fail();
    } catch (NullPointerException expected) {
    }

    try {
      J.join(ITERABLE_NULL.iterator());
      fail();
    } catch (NullPointerException expected) {
    }
    try {
      J.join(ITERABLE_1_NULL_2.iterator());
      fail();

   */
  public final String join(Iterable<? extends @Nullable Object> parts) {
    return join(parts.iterator());
  }

  /**
   * Returns a string containing the string representation of each of {@code parts}, using the
   * previously configured separator between each.
   *
   * @since 11.0
   */
  public final String join(Iterator<? extends @Nullable Object> parts) {

  }

  public void testJoin() {
    assertThat(join()).isEmpty();
    assertThat(join(1)).isEqualTo("1");
    assertThat(join(1, 2)).isEqualTo("1,2");
    assertThat(join(-1, Integer.MIN_VALUE)).isEqualTo("4294967295,2147483648");

    assertThat(UnsignedInts.join("", 1, 2, 3)).isEqualTo("123");
  }

  private static String join(int... values) {
    return UnsignedInts.join(",", values);
  }

  @J2ktIncompatible

    try {
      J.join(ITERABLE_NULL);
      fail();
    } catch (NullPointerException expected) {
    }
    try {
      J.join(ITERABLE_1_NULL_2);
      fail();
    } catch (NullPointerException expected) {
    }

    try {
      J.join(ITERABLE_NULL.iterator());
      fail();
    } catch (NullPointerException expected) {
    }
    try {
      J.join(ITERABLE_1_NULL_2.iterator());
      fail();

  }

  public void testJoin() {
    assertThat(SignedBytes.join(",", EMPTY)).isEmpty();
    assertThat(SignedBytes.join(",", ARRAY1)).isEqualTo("1");
    assertThat(SignedBytes.join(",", (byte) 1, (byte) 2)).isEqualTo("1,2");
    assertThat(SignedBytes.join("", (byte) 1, (byte) 2, (byte) 3)).isEqualTo("123");
    assertThat(SignedBytes.join(",", (byte) -128, (byte) -1)).isEqualTo("-128,-1");
  }

  }

  public void testJoin() {
    assertThat(join()).isEmpty();
    assertThat(join(1)).isEqualTo("1");
    assertThat(join(1, 2)).isEqualTo("1,2");
    assertThat(join(-1, Integer.MIN_VALUE)).isEqualTo("4294967295,2147483648");

    assertThat(UnsignedInts.join("", 1, 2, 3)).isEqualTo("123");
  }

  private static String join(int... values) {
    return UnsignedInts.join(",", values);
  }

  @J2ktIncompatible

    assertThat(UnsignedLongs.join(",")).isEmpty();
    assertThat(UnsignedLongs.join(",", 1)).isEqualTo("1");
    assertThat(UnsignedLongs.join(",", 1, 2)).isEqualTo("1,2");
    assertThat(UnsignedLongs.join(",", -1, Long.MIN_VALUE))
        .isEqualTo("18446744073709551615,9223372036854775808");
    assertThat(UnsignedLongs.join("", 1, 2, 3)).isEqualTo("123");
    assertThat(UnsignedLongs.join("", -1, Long.MIN_VALUE))

    } catch (IllegalArgumentException expected) {
    }
  }

  public void testJoin() {
    assertThat(Booleans.join(",", EMPTY)).isEmpty();
    assertThat(Booleans.join(",", ARRAY_FALSE)).isEqualTo("false");
    assertThat(Booleans.join(",", false, true)).isEqualTo("false,true");
    assertThat(Booleans.join("", false, true, false)).isEqualTo("falsetruefalse");
  }

  public void testLexicographicalComparator() {

    } catch (IllegalArgumentException expected) {
    }
  }

  public void testJoin() {
    assertThat(Booleans.join(",", EMPTY)).isEmpty();
    assertThat(Booleans.join(",", ARRAY_FALSE)).isEqualTo("false");
    assertThat(Booleans.join(",", false, true)).isEqualTo("false,true");
    assertThat(Booleans.join("", false, true, false)).isEqualTo("falsetruefalse");
  }

  public void testLexicographicalComparator() {

  public void testJoin() {
    assertThat(Doubles.join(",", EMPTY)).isEmpty();
    assertThat(Doubles.join(",", ARRAY1)).isEqualTo("1.0");
    assertThat(Doubles.join(",", (double) 1, (double) 2)).isEqualTo("1.0,2.0");
    assertThat(Doubles.join("", (double) 1, (double) 2, (double) 3)).isEqualTo("1.02.03.0");
  }

  public void testJoinNonTrivialDoubles() {
    assertThat(Doubles.join(",", EMPTY)).isEmpty();