assertEquals("123.123.123.123:21", ftpInfo.getCacheKey());
        assertEquals("123.123.123.123", ftpInfo.getHost());
        assertEquals(21, ftpInfo.getPort());
        assertEquals("/test1", ftpInfo.getParent());
        assertEquals("test.txt", ftpInfo.getName());
        assertEquals("ftp://123.123.123.123/", ftpInfo.toUrl("/"));

    Iterable<Integer> iterable = asList(1, 2, 3);
    int n = 4;
    Iterable<Integer> repeated = Iterables.concat(nCopies(n, iterable));
    assertThat(repeated).containsExactly(1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3).inOrder();
  }

  public void testPartition_badSize() {
    Iterable<Integer> source = singleton(1);
    assertThrows(IllegalArgumentException.class, () -> Iterables.partition(source, 0));
  }