utils.test.js
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'use strict';
var Buffer = require('safe-buffer').Buffer;
var utils = require('../lib/utils');
var assert = require('assert');
var debug = require('debug');
var mongo;
try {
mongo = new require('mongodb');
} catch (e) {
debug('mongo', 'cannot construct mongodb instance');
}
describe('lib/utils', function() {
describe('clone', function() {
it('clones constructors named ObjectId', function(done) {
function ObjectId(id) {
this.id = id;
}
var o1 = new ObjectId('1234');
var o2 = utils.clone(o1);
assert.ok(o2 instanceof ObjectId);
done();
});
it('clones constructors named ObjectID', function(done) {
function ObjectID(id) {
this.id = id;
}
var o1 = new ObjectID('1234');
var o2 = utils.clone(o1);
assert.ok(o2 instanceof ObjectID);
done();
});
it('does not clone constructors named ObjectIdd', function(done) {
function ObjectIdd(id) {
this.id = id;
}
var o1 = new ObjectIdd('1234');
var o2 = utils.clone(o1);
assert.ok(!(o2 instanceof ObjectIdd));
done();
});
it('optionally clones ObjectId constructors using its clone method', function(done) {
function ObjectID(id) {
this.id = id;
this.cloned = false;
}
ObjectID.prototype.clone = function() {
var ret = new ObjectID(this.id);
ret.cloned = true;
return ret;
};
var id = 1234;
var o1 = new ObjectID(id);
assert.equal(id, o1.id);
assert.equal(false, o1.cloned);
var o2 = utils.clone(o1);
assert.ok(o2 instanceof ObjectID);
assert.equal(id, o2.id);
assert.ok(o2.cloned);
done();
});
it('clones mongodb.ReadPreferences', function(done) {
if (!mongo) return done();
var tags = [
{dc: 'tag1'}
];
var prefs = [
new mongo.ReadPreference('primary'),
new mongo.ReadPreference(mongo.ReadPreference.PRIMARY_PREFERRED),
new mongo.ReadPreference('secondary', tags)
];
var prefsCloned = utils.clone(prefs);
for (var i = 0; i < prefsCloned.length; i++) {
assert.notEqual(prefs[i], prefsCloned[i]);
if (prefs[i].tags) {
assert.ok(prefsCloned[i].tags);
assert.notEqual(prefs[i].tags, prefsCloned[i].tags);
assert.notEqual(prefs[i].tags[0], prefsCloned[i].tags[0]);
} else {
assert.equal(prefsCloned[i].tags, null);
}
}
done();
});
it('clones mongodb.Binary', function(done) {
if (!mongo) return done();
var buf = Buffer.from('hi');
var binary = new mongo.Binary(buf, 2);
var clone = utils.clone(binary);
assert.equal(binary.sub_type, clone.sub_type);
assert.equal(String(binary.buffer), String(buf));
assert.ok(binary !== clone);
done();
});
it('handles objects with no constructor', function(done) {
var name = '335';
var o = Object.create(null);
o.name = name;
var clone;
assert.doesNotThrow(function() {
clone = utils.clone(o);
});
assert.equal(name, clone.name);
assert.ok(o != clone);
done();
});
it('handles buffers', function(done) {
var buff = Buffer.alloc(10);
buff.fill(1);
var clone = utils.clone(buff);
for (var i = 0; i < buff.length; i++) {
assert.equal(buff[i], clone[i]);
}
done();
});
});
});