Add HPACK test cases

src/hpack/mod.rs

@@ -2,9 +2,10 @@ mod encoder;
 mod decoder;
 mod entry;
 mod huffman;
-// mod table;
+
+#[cfg(test)]
+mod test;
 
 pub use self::encoder::Encoder;
 pub use self::entry::{Entry, Key};
 pub use self::decoder::{Decoder, DecoderError};
-// pub use self::table::Entry;