mod deflate_stream {    use crate::zlib::stream::DeflateWriter;    use crate::zlib::stream::InflateReader;    use std::io::{Read, Write};     #[test]    fn all_at_once() -> Result<(), Box<dyn std::error::Error>> {        let mut w = DeflateWriter::new(Vec::new());        assert_eq!(w.write(b"hello")?, 5);        w.flush()?;         let out = w.inner;        assert!(out.len() == 12 || out.len() == 13);         assert_deflate_buffer(out, b"hello")    }     fn assert_deflate_buffer(out: Vec<u8>, expected: &[u8]) -> Result<(), Box<dyn std::error::Error>> {        let mut actual = Vec::new();        InflateReader::from_read(out.as_slice()).read_to_end(&mut actual)?;        assert_eq!(actual, expected);        Ok(())    }     #[test]    fn big_file_small_writes() -> Result<(), Box<dyn std::error::Error>> {        let mut w = DeflateWriter::new(Vec::new());        let bytes = include_bytes!(            "../../../../tests/fixtures/objects/pack/pack-11fdfa9e156ab73caae3b6da867192221f2089c2.pack"        );        for chunk in bytes.chunks(2) {            assert_eq!(w.write(chunk)?, chunk.len());        }        w.flush()?;         assert_deflate_buffer(w.inner, bytes)    }     #[test]    fn big_file_a_few_big_writes() -> Result<(), Box<dyn std::error::Error>> {        let mut w = DeflateWriter::new(Vec::new());        let bytes = include_bytes!(            "../../../../tests/fixtures/objects/pack/pack-11fdfa9e156ab73caae3b6da867192221f2089c2.pack"        );        for chunk in bytes.chunks(4096 * 9) {            assert_eq!(w.write(chunk)?, chunk.len());        }        w.flush()?;         assert_deflate_buffer(w.inner, bytes)    }}