objstr 0.1.1

File stream abstraction for Rust
Documentation 
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use std::{fs, io::SeekFrom, path::Path};

use objstr::{api::ObjStr as _, file::FileObjStr};

fn setup(name: &str) -> FileObjStr {
    let name = format!(".test/file/file_obj_str_test/{}.bin", name);
    let path = Path::new(
        name.as_str()
    );
    if path.exists() {
        std::fs::remove_file(
            name.as_str()
        ).unwrap();
    }
    fs::create_dir_all(path.parent().unwrap()).unwrap();
    FileObjStr::new(path).unwrap()
}

fn teardown(name: &str) -> Vec<u8> {
    let bytes = std::fs::read(
        format!(".test/file/file_obj_str_test/{}.bin", name).as_str()
    ).unwrap();
    std::fs::remove_file(
        format!(".test/file/file_obj_str_test/{}.bin", name).as_str()
    ).unwrap();
    bytes
}

#[test]
fn test_append() {
    let mut str = setup("test_append");

    str.append(b"Hello, world1".to_vec()).unwrap();

    let bytes = teardown("test_append");

    assert_eq!(bytes, b"\x00\x00\x00\x0dHello, world1\x00\x00\x00\x0d\x00".to_vec());
}

#[test]
fn test_read() {
    let mut str = setup("test_read");

    str.append(b"Hello, world1".to_vec()).unwrap();

    str.seek(SeekFrom::Start(0)).unwrap();

    assert_eq!(str.read().unwrap(), b"Hello, world1".to_vec());

    let _ = teardown("test_read");
}

#[test]
fn test_seek_start_forward() {
    let mut str = setup("test_seek_start_forward");

    str.append(b"Hello, world1".to_vec()).unwrap();
    str.append(b"Hello, world2".to_vec()).unwrap();

    str.seek(SeekFrom::Start(1)).unwrap();

    assert_eq!(str.read().unwrap(), b"Hello, world2".to_vec());

    let _ = teardown("test_seek_start_forward");
}

#[test]
fn test_seek_current_forward() {
    let mut str = setup("test_seek_current_forward");

    str.append(b"Hello, world1".to_vec()).unwrap();
    str.append(b"Hello, world2".to_vec()).unwrap();

    str.seek(SeekFrom::Start(0)).unwrap();
    str.seek(SeekFrom::Current(1)).unwrap();

    assert_eq!(str.read().unwrap(), b"Hello, world2".to_vec());

    let _ = teardown("test_seek_current_forward");
}

#[test]
fn test_seek_current_backward() {
    let mut str = setup("test_seek_current_backward");

    str.append(b"Hello, world1".to_vec()).unwrap();
    str.append(b"Hello, world2".to_vec()).unwrap();

    str.seek(SeekFrom::End(0)).unwrap();
    str.seek(SeekFrom::Current(-1)).unwrap();

    assert_eq!(str.read().unwrap(), b"Hello, world2".to_vec());

    let _ = teardown("test_seek_current_backward");
}

#[test]
fn test_seek_end_forward() {
    let mut str = setup("test_seek_end_forward");

    str.append(b"Hello, world1".to_vec()).unwrap();
    str.append(b"Hello, world2".to_vec()).unwrap();

    str.seek(SeekFrom::End(1)).unwrap();

    assert_eq!(str.read().unwrap(), b"Hello, world2".to_vec());

    let _ = teardown("test_seek_end_forward");
}

#[test]
fn test_seek_end_backward() {
    let mut str = setup("test_seek_end_backward");

    str.append(b"Hello, world1".to_vec()).unwrap();
    str.append(b"Hello, world2".to_vec()).unwrap();

    str.seek(SeekFrom::End(-1)).unwrap();

    assert_eq!(str.read().unwrap(), b"Hello, world2".to_vec());

    let _ = teardown("test_seek_end_backward");
}


#[test]
fn test_len_0_0() {
    let mut str = setup("test_len_0_0");

    str.append(b"Hello, world1".to_vec()).unwrap();
    str.append(b"Hello, world2".to_vec()).unwrap();

    str.seek(SeekFrom::Start(0)).unwrap();

    assert_eq!(str.len(0, 0).unwrap(), 0);

    let _ = teardown("test_len_0_0");
}

#[test]
fn test_len_0_1() {
    let mut str = setup("test_len_0_1");

    str.append(b"Hello, world1".to_vec()).unwrap();
    str.append(b"Hello, world2".to_vec()).unwrap();

    str.seek(SeekFrom::Start(0)).unwrap();

    assert_eq!(str.len(0, 1).unwrap(), 13 + 8);

    let _ = teardown("test_len_0_1");
}

#[test]
fn test_len_1_0() {
    let mut str = setup("test_len_1_0");

    str.append(b"Hello, world1".to_vec()).unwrap();
    str.append(b"Hello, world2".to_vec()).unwrap();

    str.seek(SeekFrom::Start(0)).unwrap();

    assert!(str.len(1, 0).is_err());

    let _ = teardown("test_len_1_0");
}

#[test]
fn test_len_1_1() {
    let mut str = setup("test_len_1_1");

    str.append(b"Hello, world1".to_vec()).unwrap();
    str.append(b"Hello, world2".to_vec()).unwrap();

    str.seek(SeekFrom::Start(0)).unwrap();

    assert_eq!(str.len(1, 1).unwrap(), 13);

    let _ = teardown("test_len_1_1");
}

#[test]
fn test_len_1_2() {
    let mut str = setup("test_len_1_2");

    str.append(b"Hello, world1".to_vec()).unwrap();
    str.append(b"Hello, world2".to_vec()).unwrap();

    str.seek(SeekFrom::Start(0)).unwrap();

    assert_eq!(str.len(1, 2).unwrap(), 13*2 + 8);

    let _ = teardown("test_len_1_2");
}

#[test]
fn test_len_2_1() {
    let mut str = setup("test_len_2_1");

    str.append(b"Hello, world1".to_vec()).unwrap();
    str.append(b"Hello, world2".to_vec()).unwrap();

    str.seek(SeekFrom::Start(0)).unwrap();

    assert_eq!(str.len(2, 1).unwrap(), 13+8 - 8*2);

    let _ = teardown("test_len_2_1");
}

#[test]
fn test_cut_random() {
    let mut str = setup("test_cut_random");

    str.append(b"Hello, world1".to_vec()).unwrap();
    str.append(b"Hello, world2".to_vec()).unwrap();

    str.seek(SeekFrom::Start(1)).unwrap();

    str.cut().unwrap();

    let bytes = teardown("test_cut_random");

    assert_eq!(bytes, b"\x00\x00\x00\x0dHello, world1\x00\x00\x00\x0d\x00".to_vec());
}

#[test]
fn test_cut_start() {
    let mut str = setup("test_cut_start");

    str.append(b"Hello, world1".to_vec()).unwrap();
    str.append(b"Hello, world2".to_vec()).unwrap();

    str.seek(SeekFrom::Start(0)).unwrap();

    str.cut().unwrap();

    let bytes = teardown("test_cut_start");

    assert_eq!(bytes, b"\x00".to_vec());
}

#[test]
fn test_cut_end() {
    let mut str = setup("test_cut_end");

    str.append(b"Hello, world1".to_vec()).unwrap();
    str.append(b"Hello, world2".to_vec()).unwrap();

    str.seek(SeekFrom::End(0)).unwrap();

    str.cut().unwrap();

    let bytes = teardown("test_cut_end");

    assert_eq!(bytes, b"\x00\x00\x00\x0dHello, world1\x00\x00\x00\x0d\x00\x00\x00\x0dHello, world2\x00\x00\x00\x0d\x00".to_vec());
}

#[test]
fn test_overwrite_0_0() {
    let mut str = setup("test_overwrite_0_0");

    str.append(b"Hello, world1".to_vec()).unwrap();

    str.seek(SeekFrom::Start(0)).unwrap();

    str.overwrite(vec![], 0).unwrap();

    let bytes = teardown("test_overwrite_0_0");

    assert_eq!(bytes, b"\x00\x00\x00\x0dHello, world1\x00\x00\x00\x0d\x00".to_vec());
}

#[test]
fn test_overwrite_0_1() {
    let mut str = setup("test_overwrite_0_1");

    str.append(b"Hello, world1".to_vec()).unwrap();

    str.seek(SeekFrom::Start(0)).unwrap();

    assert!(str.overwrite(vec![b"Hello, world2".to_vec()], 0).is_err());

    let _ = teardown("test_overwrite_0_1");
}

#[test]
fn test_overwrite_1_1() {
    let mut str = setup("test_overwrite_1_1");

    str.append(b"Hello, world1".to_vec()).unwrap();

    str.seek(SeekFrom::Start(0)).unwrap();

    str.overwrite(vec![b"Hello, world2".to_vec()], 1).unwrap();

    let bytes = teardown("test_overwrite_1_1");

    assert_eq!(bytes, b"\x00\x00\x00\x0dHello, world2\x00\x00\x00\x0d\x00".to_vec());
}

#[test]
fn test_overwrite_1_2() {
    let mut str = setup("test_overwrite_1_2");

    str.append(b"Hello, world1".to_vec()).unwrap();
    str.append(b"Hello, world2".to_vec()).unwrap();

    str.seek(SeekFrom::Start(0)).unwrap();

    str.overwrite(vec![b"Hello, world2 --  -- Hello, world2".to_vec()], 2).unwrap();

    let bytes = teardown("test_overwrite_1_2");

    assert_eq!(bytes, b"\x00\x00\x00\x22Hello, world2 --  -- Hello, world2\x00\x00\x00\x22\x00".to_vec());
}

#[test]
fn test_overwrite_2_1() {
    let mut str = setup("test_overwrite_2_1");

    str.append(b"Hello, world1".to_vec()).unwrap();
    
    str.seek(SeekFrom::Start(0)).unwrap();

    println!("{:?}", str.len(2, 1).unwrap());

    str.overwrite(vec![b"Hey".to_vec(), b"Ey".to_vec()], 1).unwrap();

    let bytes = teardown("test_overwrite_2_1");

    assert_eq!(bytes, b"\x00\x00\x00\x03Hey\x00\x00\x00\x03\x00\x00\x00\x02Ey\x00\x00\x00\x02\x00".to_vec());
}

#[test] 
fn test_seek_start_forward_error() {
    let mut str = setup("test_seek_start_forward_error");

    str.append(b"Hello, world1".to_vec()).unwrap();
    str.append(b"Hello, world2".to_vec()).unwrap();

    assert!(str.seek(SeekFrom::Start(100)).is_err());

    assert!(str.read().is_err());

    let _ = teardown("test_seek_start_forward_error");
}

#[test]
fn test_seek_current_forward_error() {
    let mut str = setup("test_seek_current_forward_error");

    str.append(b"Hello, world1".to_vec()).unwrap();
    str.append(b"Hello, world2".to_vec()).unwrap();

    
    assert!(str.seek(SeekFrom::Start(0)).is_ok());
    assert!(str.seek(SeekFrom::Current(100)).is_err());

    assert!(str.read().is_err());

    let _ = teardown("test_seek_current_forward_error");
}

#[test]
fn test_seek_current_backward_error() {
    let mut str = setup("test_seek_current_backward_error");

    str.append(b"Hello, world1".to_vec()).unwrap();
    str.append(b"Hello, world2".to_vec()).unwrap();

    
    assert!(str.seek(SeekFrom::End(0)).is_ok());
    assert!(str.seek(SeekFrom::Current(-100)).is_err());

    assert_eq!(str.read().unwrap(), b"Hello, world1".to_vec());

    let _ = teardown("test_seek_current_backward_error");
}

#[test]
fn test_seek_end_forward_error() {
    let mut str = setup("test_seek_end_forward_error");

    str.append(b"Hello, world1".to_vec()).unwrap();
    str.append(b"Hello, world2".to_vec()).unwrap();

    
    assert!(str.seek(SeekFrom::End(100)).is_err());

    assert_eq!(str.read().unwrap(), b"Hello, world1".to_vec());

    let _ = teardown("test_seek_end_forward_error");
}

#[test]
fn test_seek_end_backward_error() {
    let mut str = setup("test_seek_end_backward_error");

    str.append(b"Hello, world1".to_vec()).unwrap();
    str.append(b"Hello, world2".to_vec()).unwrap();

    
    assert!(str.seek(SeekFrom::End(-100)).is_err());

    assert_eq!(str.read().unwrap(), b"Hello, world1".to_vec());

    let _ = teardown("test_seek_end_backward_error");
}