extend.test.js
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var assert = require('chai').assert,
lib = require('../lib/deap');
describe('shallow extend', function() {
var shallow = lib.extendShallow;
it('should return a reference to the first argument', function() {
var a = { burp: 'adurp' },
b = { burp: 'zing', grr: 'arghh' };
var result = shallow(a, b);
assert.strictEqual(result, a);
});
it('should copy simple values', function() {
var a = {},
b = { s: 'string', n: 1, b: false, a: [], o: {}};
var c = shallow(a, b);
assert.deepEqual(c, a);
assert.equal(c.s, b.s);
assert.equal(c.n, b.n);
assert.equal(c.b, b.b);
assert.strictEqual(c.a, b.a);
assert.strictEqual(c.o, b.o);
});
it('should only alter first param', function() {
var a = { doom: 'song' },
b = { burp: 'adurp' },
c = { grr: 'argh' };
var result = shallow({}, a, b, c);
assert.deepEqual(a, { doom: 'song' });
assert.deepEqual(b, { burp: 'adurp' });
assert.deepEqual(c, { grr: 'argh' });
assert.sameMembers(Object.keys(result), ['doom', 'burp', 'grr']);
assert.equal(result.doom, a.doom);
assert.equal(result.burp, b.burp);
assert.equal(result.grr, c.grr);
});
it('should preserve object references', function() {
var deep = { foo: 'bar' },
a = { burp: 'adurp' , nested: deep };
var result = shallow({}, a);
assert.strictEqual(result.nested, deep);
});
it('should preserve date references', function() {
var a = { burp: 'adurp', date: new Date() },
date = a.date;
var result = shallow({}, a);
assert.strictEqual(result.date, date);
});
it('should preserve regexp references', function() {
var a = { burp: 'adurp', regexp: /foo/g },
regexp = a.regexp;
var result = shallow({}, a);
assert.strictEqual(result.regexp, regexp);
});
it('should preserve array references', function() {
var a = { burp: 'adurp', array: [] },
array = a.array;
var result = shallow({}, a);
assert.strictEqual(result.array, array);
});
it('should not pick up non-enumberable properties', function() {
var result = shallow({}, function() {});
assert.deepEqual(result, {});
assert.equal(Object.keys(result).length, 0);
assert.equal(Object.getOwnPropertyNames(result).length, 0);
});
});
describe('deep extend', function() {
var deepExtend = lib.extend;
it('should return a reference to the first argument', function() {
var a = { burp: 'adurp' },
b = { burp: 'zing', grr: 'arghh' };
var result = deepExtend(a, b);
assert.strictEqual(result, a);
});
it('should not preserve object references', function() {
var deeper = { boo: 'far' },
deep = { foo: 'bar', nested: deeper },
a = { burp: 'adurp' , nested: deep };
var result = deepExtend({}, a);
assert.deepEqual(result, a);
assert.notStrictEqual(result.nested, deep);
assert.notStrictEqual(result.nested.nested, deeper);
});
it('should not preserve date references', function() {
var a = { burp: 'adurp', date: new Date() },
date = a.date;
var result = deepExtend({}, a);
assert.deepEqual(result, a);
assert.equal(result.date.getTime(), date.getTime()); // added this because deepEqual doesn't work with dates
assert.notStrictEqual(result.date, date);
});
it('should not preserve regexp references', function() {
var a = { burp: 'adurp', regexp: /foo/g },
regexp = a.regexp;
var result = deepExtend({}, a);
assert.deepEqual(result, a);
assert.notStrictEqual(result.regexp, regexp);
});
it('should not preserve array references', function() {
var deeper = { boo: 'far' },
deep = { foo: 'bar', nested: deeper },
a = { burp: 'adurp' , nested: [deep, deeper] };
var result = deepExtend({}, a);
assert.deepEqual(result, a);
assert.notStrictEqual(result.nested, a.nested);
assert.notStrictEqual(result.nested[0], deep);
assert.notStrictEqual(result.nested[0].nested, deeper);
assert.notStrictEqual(result.nested[1], deeper);
assert.deepEqual(result.nested[0].nested, result.nested[1]);
assert.notStrictEqual(result.nested[0].nested, result.nested[1]);
});
// Vulnerability reported via hacker1: https://hackerone.com/reports/310446
it('should not modify Object prototype (hacker1 #310446)', function() {
var a = { foo: 'bar' },
b = JSON.parse('{ "__proto__": { "evilBad": "DANGER!!!" } }');
var result = deepExtend(a, b);
assert.isUndefined({}.evilBad);
assert.isUndefined(Object.prototype.evilBad);
});
});