}
            });
    assertEquals(ImmutableList.of("foo"), list);
    assertTrue(lines.wasStreamOpened() && lines.wasStreamClosed());
  }

  public void testCopyToAppendable_doesNotCloseIfWriter() throws IOException {
    TestWriter writer = new TestWriter();
    assertFalse(writer.closed());
    source.copyTo(writer);
    assertFalse(writer.closed());
  }