/**
 */
(function() {
    "use strict";

    const conn = MongoRunner.runMongod({binVersion: "latest"});
    const db = conn.getDB(jsTest.name());

    const coll = db[jsTest.name()];
    const view42 = "viewWithNow42";
    coll.drop();
    assert.commandWorkedOrFailedWithCode(db.runCommand({drop: view42}),
                                         ErrorCodes.NamespaceNotFound);

    // Just insert a single document so we have something to work with.
    assert.writeOK(coll.insert({a: 1}));

    assert.commandWorked(
        db.createView(view42, coll.getName(), [{$addFields: {timeField: "$$NOW"}}]),
        'Expected a view with $$NOW to succeed');

    assert.commandWorked(db.adminCommand({setFeatureCompatibilityVersion: "4.0"}));

    // It should not be possble to create a view with $$NOW in the 4.0 mode.
    assert.commandFailedWithCode(
        db.createView("viewWithNow", coll.getName(), [{$addFields: {timeField: "$$NOW"}}]),
        ErrorCodes.QueryFeatureNotAllowed,
        'Expected a view with $$NOW to fail');

    // It should not be possble to create a view with $$CLUSTER_TIME in the 4.0 mode.
    assert.commandFailedWithCode(
        db.createView("viewWithNow", coll.getName(), [{$addFields: {timeField: "$$CLUSTER_TIME"}}]),
        ErrorCodes.QueryFeatureNotAllowed,
        'Expected a view with $$CLUSTER_TIME to fail');

    // But querying the existing views continue to work.
    assert.commandWorked(db.runCommand({aggregate: view42, pipeline: [], cursor: {}}),
                         'Expected an aggregate with view to work');

    MongoRunner.stopMongod(conn);
}());