BaseEncoding encoding, String decoded, String encoded) throws IOException {
    testStreamingEncoding(encoding, decoded, encoded);

    // test separators work
    for (int sepLength = 3; sepLength <= 5; sepLength++) {
      for (String separator : ImmutableList.of(",", "\n", ";;", "")) {
        testStreamingEncoding(
            encoding.withSeparator(separator, sepLength),
            decoded,