for (String separator : ImmutableList.of(",", "\n", ";;", "")) {
        testEncoding(
            encoding.withSeparator(separator, sepLength),
            decoded,
            Joiner.on(separator).join(Splitter.fixedLength(sepLength).split(encoded)));
      }
    }
  }

  private static void testEncoding(BaseEncoding encoding, String decoded, String encoded) {
    testEncodes(encoding, decoded, encoded);