mongodb 0.9.1

The official MongoDB driver for Rust (currently in alpha)
Documentation 
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use lazy_static::lazy_static;

use crate::{cmap::StreamDescription, options::auth::AuthMechanism};

lazy_static! {
    static ref MECHS: [String; 2] = [
        AuthMechanism::ScramSha1.as_str().to_string(),
        AuthMechanism::ScramSha256.as_str().to_string()
    ];
}

#[test]
fn negotiate_both_scram() {
    let description_both = StreamDescription {
        sasl_supported_mechs: Some(MECHS.to_vec()),
        ..Default::default()
    };
    assert_eq!(
        AuthMechanism::from_stream_description(&description_both),
        AuthMechanism::ScramSha256
    );
}

#[test]
fn negotiate_sha1_only() {
    let description_sha1 = StreamDescription {
        sasl_supported_mechs: Some(MECHS[0..=0].to_vec()),
        ..Default::default()
    };
    assert_eq!(
        AuthMechanism::from_stream_description(&description_sha1),
        AuthMechanism::ScramSha1
    );
}

#[test]
fn negotiate_sha256_only() {
    let description_sha256 = StreamDescription {
        sasl_supported_mechs: Some(MECHS[1..=1].to_vec()),
        ..Default::default()
    };
    assert_eq!(
        AuthMechanism::from_stream_description(&description_sha256),
        AuthMechanism::ScramSha256
    );
}

#[test]
fn negotiate_none() {
    let description_none: StreamDescription = Default::default();
    assert_eq!(
        AuthMechanism::from_stream_description(&description_none),
        AuthMechanism::ScramSha1
    );
}

#[test]
fn negotiate_mangled() {
    let description_mangled = StreamDescription {
        sasl_supported_mechs: Some(["NOT A MECHANISM".to_string(), "OTHER".to_string()].to_vec()),
        ..Default::default()
    };
    assert_eq!(
        AuthMechanism::from_stream_description(&description_mangled),
        AuthMechanism::ScramSha1
    );
}