some write progress

src/lib.rs

@@ -12,3 +12,24 @@ pub use crate::demo::{
 pub(crate) mod consthash;
 pub mod demo;
 mod nullhasher;
+
+#[cfg(test)]
+#[track_caller]
+fn test_roundtrip_encode<
+    'a,
+    T: bitbuffer::BitRead<'a, bitbuffer::LittleEndian>
+        + bitbuffer::BitWrite<bitbuffer::LittleEndian>
+        + std::fmt::Debug
+        + std::cmp::PartialEq,
+>(
+    val: T,
+) {
+    use bitbuffer::{BitReadBuffer, BitReadStream, BitWriteStream, LittleEndian};
+    let mut stream = BitWriteStream::new(LittleEndian);
+    val.write(&mut stream).unwrap();
+    let pos = stream.bit_len();
+
+    let mut read = BitReadStream::new(BitReadBuffer::new_owned(stream.finish(), LittleEndian));
+    assert_eq!(val, read.read().unwrap());
+    assert_eq!(pos, read.pos());
+}