return list;
              }
            });
    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());
  }

    source.forEachLine(builder::add);

    assertEquals(SPLIT_LINES, builder.build());
    assertTrue(source.wasStreamOpened());
    assertTrue(source.wasStreamClosed());
  }

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

    File i18nFile = getTestFile("i18n.txt");
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    Files.copy(i18nFile, out);
    assertEquals(I18N, out.toString("UTF-8"));
  }

  public void testCopyToAppendable() throws IOException {
    File i18nFile = getTestFile("i18n.txt");
    StringBuilder sb = new StringBuilder();
    Files.copy(i18nFile, Charsets.UTF_8, sb);
    assertEquals(I18N, sb.toString());
  }

    File i18nFile = getTestFile("i18n.txt");
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    Files.copy(i18nFile, out);
    assertEquals(I18N, out.toString("UTF-8"));
  }

  public void testCopyToAppendable() throws IOException {
    File i18nFile = getTestFile("i18n.txt");
    StringBuilder sb = new StringBuilder();
    Files.copy(i18nFile, Charsets.UTF_8, sb);
    assertEquals(I18N, sb.toString());
  }