update.test.js
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var lib = require('../lib/deap'),
assert = require('chai').assert;
describe('shallow update', function() {
var shallowUpdate = lib.updateShallow;
it('should not update anything into an empty object', function() {
var result = shallowUpdate({}, { foo: 'bar' });
assert.deepEqual(result, {});
});
it('should return a reference to the first argument', function() {
var a = { burp: 'adurp' },
b = { burp: 'zing', grr: 'arghh' };
var result = shallowUpdate(a, b);
assert.strictEqual(result, a);
});
it('should replace existing values only', function() {
var a = { burp: 'adurp' },
b = { burp: 'zing', grr: 'arghh' };
var result = shallowUpdate(a, b);
assert.deepEqual(result, a);
assert.equal(a.burp, b.burp);
assert.isUndefined(a.grr);
});
it('should replace a top level property with an multi-level object', function() {
var a = { burp: 'adurp' },
b = { burp: { foo: 'bar', biz: { baz: 'buz', zing: 'zoing' } } };
var result = shallowUpdate(a, b);
assert.deepEqual(result, a);
assert.deepEqual(result.burp, b.burp);
});
it('should replace a top level object with a string', function() {
var a = { burp: { foo: 'bar' } },
b = { burp: 'adurp' };
var result = shallowUpdate(a, b);
assert.deepEqual(result, a);
assert.deepEqual(result.burp, b.burp);
});
});
describe('deep update', function() {
var deepUpdate = lib.update;
it('should return a reference to the first argument', function() {
var a = { burp: 'adurp' },
b = { burp: 'zing', grr: 'arghh' };
var result = deepUpdate(a, b);
assert.strictEqual(result, a);
});
it('should update a nested object one level deep', function() {
var a = { foo: 'bar', deep: { foo: 'bar', baz: 'buzz' }},
b = { deep: { foo: 'beep' } };
var result = deepUpdate(a, b);
assert.equal(result.foo, a.foo);
assert.equal(result.deep.foo, b.deep.foo);
assert.equal(result.deep.baz, a.deep.baz);
});
it('should update a nested object two levels deep', function() {
var a = { foo: 'bar', deep: { hi: 'hello', deeper: { foo: 'bar', baz: 'buzz' }}},
b = { deep: { deeper: { foo: 'beep' } } };
var result = deepUpdate(a, b);
assert.equal(result.foo, a.foo);
assert.isObject(result.deep);
assert.equal(result.deep.hi, a.deep.hi);
assert.isObject(result.deep.deeper);
assert.equal(result.deep.deeper.foo, b.deep.deeper.foo);
assert.equal(result.deep.deeper.baz, a.deep.deeper.baz);
});
it('should update properties from multiple objects', function() {
var a = { foo: ['one'], boo: 'far', poo: 'tar' },
b = { foo: ['two', 'three'], zoo: 'car' },
c = { boo: 'star', two: 'czar' };
var result = deepUpdate(a, b, c);
assert.deepEqual(result, {
foo: b.foo,
boo: c.boo,
poo: a.poo
});
});
it('should not update properties that are not on the first argument', function() {
var a = { foo: 'bar', deep: { deeper: { foo: 'bar' } } },
b = { boo: 'far', deep: { hi: 'hello', deeper: { foo: 'beep', baz: 'buzz' } } };
var result = deepUpdate(a, b);
assert.isUndefined(result.boo);
assert.isObject(result.deep);
assert.isUndefined(result.deep.hi);
assert.isObject(result.deep.deeper);
assert.isUndefined(result.deep.deeper.baz);
assert.equal(result.deep.deeper.foo, b.deep.deeper.foo);
});
it('should not preserve nested object references', function() {
var a = { foo: 'bar' },
nested = { grr: 'argh' },
newFoo = { burp: nested },
b = { foo: newFoo };
var result = deepUpdate(a, b);
assert.deepEqual(a.foo.burp, b.foo.burp);
assert.notStrictEqual(a.foo.burp, nested);
});
it('should preserve array references', function() {
var a = { nested: [{ foo: 'bar' }] },
b = { nested: [{ boo: 'far' }] },
deep = a.nested;
var result = deepUpdate(a, b);
assert.deepEqual(result.nested, b.nested);
assert.notStrictEqual(result.nested, b.nested);
assert.strictEqual(result.nested, a.nested);
assert.strictEqual(result.nested, deep);
});
it('should not preserve references in arrays', function() {
var a = { nested: [{ foo: 'bar' }] },
b = { nested: [{ boo: 'far' }] },
deeper = a.nested[0];
var result = deepUpdate(a, b);
assert.deepEqual(result.nested, b.nested);
assert.notStrictEqual(result.nested[0], deeper);
});
it('should only replace existing properties in nested objects', function() {
var a = { burp: { thing: 'thang', biz: { burp: 'adurp' } } },
b = { burp: { foo: 'bar', biz: { burp: 'boop', baz: 'buz', zing: 'zoing' } } };
var result = deepUpdate(a, b);
assert.deepEqual(result, a);
assert.deepEqual(result.burp.thing, 'thang');
assert.deepEqual(result.burp.biz.burp, 'boop');
});
});