You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: autobreak.rs
    path of file: ./repos/image/src/codecs/pnm
    
    the code of the file until where you have to start completion: //! Insert line breaks between written buffers when they would overflow the line length.
use std::io;

// The pnm standard says to insert lin
    
    fn test_aligned_writes() {
        let mut output = Vec::new();

        {
            let mut writer = AutoBreak::new(&mut output, 10);
            writer.write_all(b"0123456789").unwrap();
            writer.write_all(b"0123456789").unwrap();
        }

        assert_eq!(output.as_slice(), b"0123456789\n0123456789");
    }