sink.writeLines(ImmutableList.of("foo", "bar", "baz").stream(), "!");
    assertEquals("foo!bar!baz!", sink.getString());
  }

  public void testClosesOnErrors_copyingFromCharSourceThatThrows() {
    for (TestOption option : EnumSet.of(OPEN_THROWS, READ_THROWS, CLOSE_THROWS)) {
      TestCharSource failSource = new TestCharSource(STRING, option);
      TestCharSink okSink = new TestCharSink();