bson 0.3.2

Encoding and decoding support for BSON in Rust
Documentation 
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use bson::oid::ObjectId;
use rustc_serialize::hex::ToHex;
use rustc_serialize::json;

#[test]
fn deserialize() {
    let bytes: [u8; 12] = [
        0xDEu8,
        0xADu8,
        0xBEu8,
        0xEFu8,  // timestamp is 3735928559
        0xEFu8,
        0xCDu8,
        0xABu8,  // machine_id is 11259375
        0xFAu8,
        0x29u8,  // process_id is 10746
        0x11u8,
        0x22u8,
        0x33u8,  // increment is 1122867
        ];

    let oid = ObjectId::with_bytes(bytes);
    assert_eq!(3735928559 as u32, oid.timestamp());
    assert_eq!(11259375 as u32, oid.machine_id());
    assert_eq!(10746 as u16, oid.process_id());
    assert_eq!(1122867 as u32, oid.counter());
}

#[test]
fn timestamp() {
    let time: u32 = 2000000;
    let oid = ObjectId::with_timestamp(time);
    let timestamp = oid.timestamp();
    assert_eq!(time, timestamp);
}

#[test]
fn timestamp_is_big_endian() {
    let time: u32 = 3857379;
    let oid = ObjectId::with_timestamp(time);
    assert_eq!(0x00u8, oid.bytes()[0]);
    assert_eq!(0x3Au8, oid.bytes()[1]);
    assert_eq!(0xDBu8, oid.bytes()[2]);
    assert_eq!(0xE3u8, oid.bytes()[3]);
}

#[test]
fn string_oid() {
    let s = "123456789012123456789012";
    let oid_res = ObjectId::with_string(s);
    assert!(oid_res.is_ok());
    let actual_s = oid_res.unwrap().bytes().to_hex();
    assert_eq!(s.to_owned(), actual_s);
}

#[test]
fn byte_string_oid() {
    let s = "541b1a00e8a23afa832b218e";
    let oid_res = ObjectId::with_string(s);
    assert!(oid_res.is_ok());
    let oid = oid_res.unwrap();
    let bytes: [u8; 12] = [0x54u8, 0x1Bu8, 0x1Au8, 0x00u8,
                           0xE8u8, 0xA2u8, 0x3Au8, 0xFAu8,
                           0x83u8, 0x2Bu8, 0x21u8, 0x8Eu8];

    assert_eq!(bytes, oid.bytes());
    assert_eq!(s, oid.to_string());
}

#[test]
fn oid_equals() {
    let oid_res = ObjectId::new();
    assert!(oid_res.is_ok());
    let oid = oid_res.unwrap();
    assert_eq!(oid, oid);
}

#[test]
fn oid_not_equals() {
    let oid1_res = ObjectId::new();
    let oid2_res = ObjectId::new();
    assert!(oid1_res.is_ok());
    assert!(oid2_res.is_ok());

    let oid1 = oid1_res.unwrap();
    let oid2 = oid2_res.unwrap();
    assert!(oid1 != oid2);
}

#[test]
fn increasing() {
    let oid1_res = ObjectId::new();
    let oid2_res = ObjectId::new();
    assert!(oid1_res.is_ok());
    assert!(oid2_res.is_ok());

    let oid1 = oid1_res.unwrap();
    let oid2 = oid2_res.unwrap();
    assert!(oid1 < oid2);
}

#[derive(RustcEncodable,RustcDecodable,PartialEq,Debug)]
struct StructWithObjectId {
    id: ObjectId
}

#[test]
fn use_in_rustc_serialize() {
    let s = "541b1a00e8a23afa832b218e";
    let s = StructWithObjectId {
        id: ObjectId::with_string(s).unwrap()
    };
    let encoded = json::encode(&s).unwrap();
    assert_eq!("{\"id\":\"541b1a00e8a23afa832b218e\"}", encoded);

    let decoded: StructWithObjectId = json::decode(&encoded).unwrap();
    assert_eq!(s, decoded);
}