ImmutableDoubleArray iia = ImmutableDoubleArray.copyOf(array);
    array[2] = 2;
    assertThat(iia.asList()).containsExactly(0.0, 1.0, 3.0).inOrder();
  }

  public void testCopyOf_iterable_notCollection_empty() {
    Iterable<Double> iterable = iterable(Collections.<Double>emptySet());
    assertThat(ImmutableDoubleArray.copyOf(iterable)).isSameInstanceAs(ImmutableDoubleArray.of());
  }

    ImmutableIntArray iia = ImmutableIntArray.copyOf(array);
    array[2] = 2;
    assertThat(iia.asList()).containsExactly(0, 1, 3).inOrder();
  }

  public void testCopyOf_iterable_notCollection_empty() {
    Iterable<Integer> iterable = iterable(Collections.<Integer>emptySet());
    assertThat(ImmutableIntArray.copyOf(iterable)).isSameInstanceAs(ImmutableIntArray.of());
  }

    ImmutableDoubleArray iia = ImmutableDoubleArray.copyOf(array);
    array[2] = 2;
    assertThat(iia.asList()).containsExactly(0.0, 1.0, 3.0).inOrder();
  }

  public void testCopyOf_iterable_notCollection_empty() {
    Iterable<Double> iterable = iterable(Collections.<Double>emptySet());
    assertThat(ImmutableDoubleArray.copyOf(iterable)).isSameInstanceAs(ImmutableDoubleArray.of());
  }