* 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());
  }

 *
 * @author Kevin Bourrillion
 * @author Jared Levy
 */
@GwtCompatible(emulated = true)
@ElementTypesAreNonnullByDefault
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");

        FileSizeFormat format = new FileSizeFormat();

        long negativeSize = -100L;
        assertThrows(IllegalArgumentException.class, () -> format.format(negativeSize));
    }

    @Test
    void testSize() {
        FileSizeFormat format = new FileSizeFormat();

        long _0_bytes = 0L;
        assertEquals("0 B", format.format(_0_bytes));

        long _5_bytes = 5L;

    ByteStreams.copy(in, out);
    in.close();
    out.close();

    assertTrue(source.wasStreamClosed());
    assertArrayEquals(bytes, out.toByteArray());
  }

  public void testSize() throws IOException {
    assertEquals(bytes.length, source.size());
    assertTrue(source.wasStreamOpened() && source.wasStreamClosed());

    // test that we can get the size even if skip() isn't supported

    /**
     * @throws Exception
     */
    @After
    public void tearDown() throws Exception {
        map = null;
    }

    /**
     * @throws Exception
     */
    @Test
    public void testSize() throws Exception {
        assertThat(map.size(), equalTo(3));
        map.put("3", "test3");
        assertThat(map.size(), equalTo(4));
    }

    /**
     * @throws Exception
     */
    @Test

    ByteStreams.copy(in, out);
    in.close();
    out.close();

    assertTrue(source.wasStreamClosed());
    assertArrayEquals(bytes, out.toByteArray());
  }

  public void testSize() throws IOException {
    assertEquals(bytes.length, source.size());
    assertTrue(source.wasStreamOpened() && source.wasStreamClosed());

    // test that we can get the size even if skip() isn't supported

      assertEquals(initialSize, map.size());
    } else {
      assertThrows(UnsupportedOperationException.class, () -> map.remove(keyToRemove));
    }
    assertInvariants(map);
  }

  public void testSize() {
    assertInvariants(makeEitherMap());
  }

  public void testKeySetRemove() {
    Map<K, V> map;
    try {
      map = makePopulatedMap();
    } catch (UnsupportedOperationException e) {

      assertEquals(initialSize, map.size());
    } else {
      assertThrows(UnsupportedOperationException.class, () -> map.remove(keyToRemove));
    }
    assertInvariants(map);
  }

  public void testSize() {
    assertInvariants(makeEitherMap());
  }

  public void testKeySetRemove() {
    Map<K, V> map;
    try {
      map = makePopulatedMap();
    } catch (UnsupportedOperationException e) {