assertThrows(IllegalStateException.class, () -> iterator.remove());
  }

  public void testSize0() {
    Iterator<String> iterator = emptyIterator();
    assertEquals(0, Iterators.size(iterator));
  }

  public void testSize1() {
    Iterator<Integer> iterator = singleton(0).iterator();
    assertEquals(1, Iterators.size(iterator));
  }

}

func TestFileReader(t *testing.T) {
	type (
		testRead struct { // Read(cnt) == (wantStr, wantErr)
			cnt     int
			wantStr string
			wantErr error
		}
		testWriteTo struct { // WriteTo(testFile{ops}) == (wantCnt, wantErr)
			ops     fileOps
			wantCnt int64
			wantErr error
		}
		testRemaining struct { // logicalRemaining() == wantLCnt, physicalRemaining() == wantPCnt
			wantLCnt int64

     * applicable for the arguments (Predicate<FluentIterableTest.X>)
     */
    // FluentIterable.of().append(aIterable).append(bIterable).filter(xPredicate);
  }

  public void testSize0() {
    assertEquals(0, FluentIterable.<String>of().size());
  }

  public void testSize1Collection() {
    assertEquals(1, FluentIterable.from(asList("a")).size());
  }

/**
 * Unit test for {@code Iterables}.
 *
 * @author Kevin Bourrillion
 * @author Jared Levy
 */
@GwtCompatible
@NullMarked
public class IterablesTest extends TestCase {

  public void testSize0() {
    Iterable<String> iterable = emptySet();
    assertEquals(0, Iterables.size(iterable));
  }

  public void testSize1Collection() {
    Iterable<String> iterable = singleton("a");

	// create xlStorage test setup
	storage, path, err := newXLStorageTestSetup(t)
	if err != nil {
		t.Fatalf("Unable to create xlStorage test setup, %s", err)
	}

	volName := "testvol"
	fileName := "testfile"
	if err := storage.MakeVol(t.Context(), volName); err != nil {
		t.Fatal(err)
	}

	// 1) Whole-file bitrot check on proper file
	size := int64(4*1024*1024 + 100*1024) // 4.1 MB