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280 lines (249 loc) · 7.62 KB
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var test = require('../util/test')(__filename);
var extend = require('../../packages/object-extend');
test('shallow extend merges properties', function(t) {
t.plan(2);
var src = {a: 3, b: 5};
t.deepEqual(extend(src, {a: 4, c: 8}), {a: 4, b: 5, c: 8});
t.deepEqual(src, {a: 4, b: 5, c: 8});
t.end();
});
test('shallow extend merges into new object', function(t) {
t.plan(2);
var src = {};
t.deepEqual(extend(src, {a: 3, b: 5}, {a: 4, c: 8}), {a: 4, b: 5, c: 8});
t.deepEqual(src, {a: 4, b: 5, c: 8});
t.end();
});
test('shallow extend does not clone child objects', function(t) {
t.plan(5);
var obj = {p: 4};
var src2 = {a: 3, b: 5};
t.deepEqual(extend(src2, {c: obj}), {a: 3, b: 5, c: {p: 4}});
obj.p = 9;
t.deepEqual(src2, {a: 3, b: 5, c: {p: 9}});
var arrInner = [1, 2, 3];
var arrOuter = ['a', 'b', arrInner];
var src1 = {a: 3, b: 5};
t.deepEqual(extend(src1, {c: arrOuter}), {a: 3, b: 5, c: ['a', 'b', [1, 2, 3]]});
t.equal(arrOuter, src1.c);
t.equal(arrInner, src1.c[2]);
t.end();
});
test('shallow extend copies non-plain objects', function(t) {
t.plan(12);
var fn = function(a, b) {
return a + b;
};
var src2 = {a: 3, b: 5};
t.deepEqual(extend(src2, {c: fn}), {a: 3, b: 5, c: fn});
t.deepEqual(src2, {a: 3, b: 5, c: fn});
t.equal(src2.c(4, 2), 6);
fn.x = 34;
t.equal(src2.c.x, 34);
var date = new Date(1510439803151);
var src3 = {a: 3, b: 5};
t.deepEqual(extend(src3, {c: date}), {a: 3, b: 5, c: date});
t.deepEqual(src3, {a: 3, b: 5, c: date});
t.equal(src3.c.getTime(), 1510439803151);
date.x = 34;
t.equal(src3.c.x, 34);
var regex = /abc/;
var src3 = {a: 3, b: 5};
t.deepEqual(extend(src3, {c: regex}), {a: 3, b: 5, c: regex});
t.deepEqual(src3, {a: 3, b: 5, c: regex});
t.equal(src3.c.exec('ddabc').index, 2);
regex.x = 34;
t.equal(src3.c.x, 34);
t.end();
});
test('deep extend merges child objects', function(t) {
t.plan(2);
var obj = {a: {b: 'c'}};
var obj2 = {a: {c: 'd'}};
t.deepEqual(extend(true, obj, obj2), {a: {b: 'c', c: 'd'}});
t.deepEqual(obj, {a: {b: 'c', c: 'd'}});
t.end();
});
test('deep extend clones child plain objects and arrays', function(t) {
t.plan(5);
var obj = {p: 4};
var src2 = {a: 3, b: 5};
t.deepEqual(extend(true, src2, {c: obj}), {a: 3, b: 5, c: {p: 4}});
obj.p = 9;
t.deepEqual(src2, {a: 3, b: 5, c: {p: 4}});
var arrInner = [1, 2, 3];
var arrOuter = ['a', 'b', arrInner];
var src1 = {a: 3, b: 5};
t.deepEqual(extend(true, src1, {c: arrOuter}), {a: 3, b: 5, c: ['a', 'b', [1, 2, 3]]});
t.notEqual(arrOuter, src1.c);
t.notEqual(arrInner, src1.c[2]);
t.end();
});
test('deep extend does not clone child non-plain objects', function(t) {
t.plan(12);
var fn = function(a, b) {
return a + b;
};
var src2 = {a: 3, b: 5};
t.deepEqual(extend(true, src2, {c: fn}), {a: 3, b: 5, c: fn});
t.deepEqual(src2, {a: 3, b: 5, c: fn});
t.equal(src2.c(4, 2), 6);
fn.x = 34;
t.equal(src2.c.x, 34);
var date = new Date(1510439803151);
var src3 = {a: 3, b: 5};
t.deepEqual(extend(true, src3, {c: date}), {a: 3, b: 5, c: date});
t.deepEqual(src3, {a: 3, b: 5, c: date});
t.equal(src3.c.getTime(), 1510439803151);
date.x = 34;
t.equal(src3.c.x, 34);
var regex = /abc/;
var src3 = {a: 3, b: 5};
t.deepEqual(extend(true, src3, {c: regex}), {a: 3, b: 5, c: regex});
t.deepEqual(src3, {a: 3, b: 5, c: regex});
t.equal(src3.c.exec('ddabc').index, 2);
regex.x = 34;
t.equal(src3.c.x, 34);
t.end();
});
test('null values are copied', function(t) {
t.plan(2);
var src = {a: 3, b: 5};
t.deepEqual(extend(src, {a: null, c: null}), {a: null, b: 5, c: null});
t.deepEqual(src, {a: null, b: 5, c: null});
t.end();
});
test('explicitly undefined values are copied', function(t) {
t.plan(2);
var src = {a: 3, b: 5};
t.deepEqual(extend(src, {a: undefined, c: undefined}), {a: undefined, b: 5, c: undefined});
t.deepEqual(src, {a: undefined, b: 5, c: undefined});
t.end();
});
test('when no extenders, extendee is returned unmutated', function(t) {
t.plan(4);
var src = {a: 3, b: 5};
var srcRef = src;
t.deepEqual(src, extend(src));
t.equal(srcRef, src);
t.deepEqual(src, extend(true, src));
t.equal(srcRef, src);
t.end();
});
test('extendee and extenders can be functions', function(t) {
t.plan(4);
var fn = function() {};
var result = extend(fn, {a: 4});
t.ok(typeof result == 'function');
t.ok(result.a === 4);
var src = {a: 3};
var fn2 = function() {};
t.deepEqual(extend(true, src, {b: fn2}), {a: 3, b: fn2});
t.deepEqual(src, {a: 3, b: fn2});
t.end();
});
test('extender can be any primitive', function(t) {
t.plan(12);
var src1 = {a: 4};
t.deepEqual(extend(src1, null), {a: 4});
t.deepEqual(src1, {a: 4});
var src2 = {a: 3};
t.deepEqual(extend(src2, undefined), {a: 3});
t.deepEqual(src2, {a: 3});
var src3 = {a: 4};
t.deepEqual(extend(src3, 'hello'), {0: 'h', 1: 'e', 2: 'l', 3: 'l', 4: 'o', a: 4});
t.deepEqual(src3, {0: 'h', 1: 'e', 2: 'l', 3: 'l', 4: 'o', a: 4});
var src4 = {1: 9, a: 4};
t.deepEqual(extend(src4, 'hello', 4), {0: 'h', 1: 'e', 2: 'l', 3: 'l', 4: 'o', a: 4});
t.deepEqual(src4, {0: 'h', 1: 'e', 2: 'l', 3: 'l', 4: 'o', a: 4});
var src5 = {a: 4};
t.deepEqual(extend(src5, false), {a: 4});
t.deepEqual(src5, {a: 4});
var src6 = {a: 4};
t.deepEqual(extend(src6, 3, true), {a: 4});
t.deepEqual(src6, {a: 4});
t.end();
});
test("extendee can't be a primitive", function(t) {
t.plan(9);
t.throws(function() {
extend(null, {b: 4, c: 5});
});
t.throws(function() {
extend(undefined, {b: 4, c: 5});
});
t.throws(function() {
extend('hello', {b: 4, c: 5});
});
t.throws(function() {
extend(3, {b: 4, c: 5});
});
t.throws(function() {
extend(false, null, {b: 4, c: 5});
});
t.throws(function() {
extend(true, undefined, {b: 4, c: 5});
});
t.throws(function() {
extend(true, 'hello', {b: 4, c: 5});
});
t.throws(function() {
extend(false, 3, {b: 4, c: 5});
});
t.throws(function() {
extend(false, false, {b: 4, c: 5});
});
t.end();
});
test('shallow extend does not copy prototype values', function(t) {
t.plan(2);
var obj1 = {a: 3, b: 5};
var obj2 = Object.create({c: 9, d: 4, e: 3});
obj2.a = 4;
obj2.e = 7;
t.deepEqual(extend(obj1, obj2), {a: 4, b: 5, e: 7});
t.deepEqual(obj1, {a: 4, b: 5, e: 7});
t.end();
});
test('deep extend does not copy prototype values', function(t) {
t.plan(2);
var obj1 = {a: 3, b: 5};
var obj2 = Object.create({c: 9, d: 4});
obj2.a = 4;
obj2.e = 7;
var obj3 = Object.create({f: 4, x: 12, y: 33});
obj3.f = 2;
obj3.g = 88;
obj2.h = obj3;
t.deepEqual(extend(true, obj1, obj2), {
a: 4,
b: 5,
e: 7,
h: {f: 2, g: 88},
});
t.deepEqual(obj1, {a: 4, b: 5, e: 7, h: {f: 2, g: 88}});
t.end();
});
test('deep extend cannot extend native prototypes', function(t) {
t.plan(14);
var attackObj1 = {constructor: {prototype: {isAdmin: true}}};
var obj1 = extend(true, {}, attackObj1);
t.equal({}.isAdmin, undefined);
t.equal({}.__proto__.isAdmin, undefined);
t.ok(typeof {}.constructor === 'function');
t.ok(obj1.constructor);
t.ok(typeof obj1.constructor === 'object');
t.ok(obj1.constructor.prototype);
t.ok(typeof obj1.constructor.prototype === 'object');
t.equal(obj1.constructor.prototype.isAdmin, true);
var attackObj2 = JSON.parse('{"__proto__": {"isAdmin": true}}');
var obj2 = extend(true, {}, attackObj2);
console.log(JSON.stringify(obj2, null, 2));
t.equal({}.isAdmin, undefined);
t.equal({}.__proto__.isAdmin, undefined);
t.ok(typeof {}.constructor === 'function');
t.ok(obj2.__proto__);
t.equal(obj2.isAdmin, true);
t.equal(obj2.__proto__.isAdmin, true);
t.end();
});