mongodb 2.8.2

The official MongoDB driver for Rust
Documentation 
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use crate::{
    bson::{doc, Bson},
    cmap::StreamDescription,
    concern::WriteConcern,
    error::{ErrorKind, WriteFailure},
    operation::{test::handle_response_test, Create, Operation},
    options::{CreateCollectionOptions, ValidationAction, ValidationLevel},
    Namespace,
};

#[test]
fn build() {
    let mut op = Create::new(
        Namespace {
            db: "test_db".to_string(),
            coll: "test_coll".to_string(),
        },
        Some(CreateCollectionOptions {
            write_concern: Some(WriteConcern {
                journal: Some(true),
                ..Default::default()
            }),
            validation_level: Some(ValidationLevel::Moderate),
            validation_action: Some(ValidationAction::Warn),
            ..Default::default()
        }),
    );

    let description = StreamDescription::new_testing();
    let cmd = op.build(&description).unwrap();

    assert_eq!(cmd.name.as_str(), "create");
    assert_eq!(cmd.target_db.as_str(), "test_db");
    assert_eq!(
        cmd.body,
        doc! {
            "create": "test_coll",
            "validationLevel": "moderate",
            "validationAction": "warn",
            "writeConcern": { "j": true },
        }
    );
}

#[test]
fn build_validator() {
    let query = doc! { "x": { "$gt": 1 } };
    let mut op = Create::new(
        Namespace {
            db: "test_db".to_string(),
            coll: "test_coll".to_string(),
        },
        Some(CreateCollectionOptions {
            validator: Some(query.clone()),
            ..Default::default()
        }),
    );

    let description = StreamDescription::new_testing();
    let cmd = op.build(&description).unwrap();

    assert_eq!(cmd.name.as_str(), "create");
    assert_eq!(cmd.target_db.as_str(), "test_db");
    assert_eq!(
        cmd.body,
        doc! {
            "create": "test_coll",
            "validator": Bson::Document(query)
        }
    );
}

#[test]
fn handle_success() {
    let op = Create::empty();
    handle_response_test(&op, doc! { "ok": 1.0 }).unwrap();
}

#[test]
fn handle_write_concern_error() {
    let op = Create::empty();

    let response = doc! {
        "writeConcernError": {
            "code": 100,
            "codeName": "hello world",
            "errmsg": "12345"
        },
        "ok": 1
    };

    let err = handle_response_test(&op, response).unwrap_err();
    match *err.kind {
        ErrorKind::Write(WriteFailure::WriteConcernError(ref wc_err)) => {
            assert_eq!(wc_err.code, 100);
            assert_eq!(wc_err.code_name, "hello world");
            assert_eq!(wc_err.message, "12345");
        }
        ref e => panic!("expected write concern error, got {:?}", e),
    }
}