mongodb/jstests/watchdog/wd_setparam.js

// Storage Node Watchdog test cases
// - Validate set parameter functions correctly.
(function() {
'use strict';
const admin = db.getSiblingDB("admin");

// Check the defaults are correct
//
function getparam(adminDb, field) {
    let q = {getParameter: 1};
    q[field] = 1;

    const ret = adminDb.runCommand(q);
    return ret[field];
}

// Verify the defaults are as we documented them
assert.eq(getparam(admin, "watchdogPeriodSeconds"), -1);

function setparam(adminDb, obj) {
    const ret = adminDb.runCommand(Object.extend({setParameter: 1}, obj));
    return ret;
}

// Negative tests
// Negative: set it too low.
assert.commandFailed(setparam(admin, {"watchdogPeriodSeconds": 1}));
// Negative: set it the min value but fail since it was not enabled.
assert.commandFailed(setparam(admin, {"watchdogPeriodSeconds": 60}));
// Negative: set it the min value + 1 but fail since it was not enabled.
assert.commandFailed(setparam(admin, {"watchdogPeriodSeconds": 61}));

// Now test MongoD with it enabled at startup
//
const conn = MongoRunner.runMongod({setParameter: "watchdogPeriodSeconds=60"});
assert.neq(null, conn, 'mongod was unable to start up');

const admin2 = conn.getDB("admin");

// Validate defaults
assert.eq(getparam(admin2, "watchdogPeriodSeconds"), 60);

// Negative: set it too low.
assert.commandFailed(setparam(admin2, {"watchdogPeriodSeconds": 1}));
// Positive: set it the min value
assert.commandWorked(setparam(admin2, {"watchdogPeriodSeconds": 60}));
// Positive: set it the min value + 1
assert.commandWorked(setparam(admin2, {"watchdogPeriodSeconds": 61}));

// Positive: disable it
assert.commandWorked(setparam(admin2, {"watchdogPeriodSeconds": -1}));

assert.eq(getparam(admin2, "watchdogPeriodSeconds"), -1);

// Positive: enable it again
assert.commandWorked(setparam(admin2, {"watchdogPeriodSeconds": 60}));

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