react-native/Libraries/Utilities/__tests__/deepFreezeAndThrowOnMutatio...

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/**
* Copyright (c) 2013-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
*/
jest.unmock('deepFreezeAndThrowOnMutationInDev');
var deepFreezeAndThrowOnMutationInDev = require('deepFreezeAndThrowOnMutationInDev');
describe('deepFreezeAndThrowOnMutationInDev', function() {
it('should be a noop on non object values', () => {
__DEV__ = true;
expect(() => deepFreezeAndThrowOnMutationInDev('')).not.toThrow();
expect(() => deepFreezeAndThrowOnMutationInDev(null)).not.toThrow();
expect(() => deepFreezeAndThrowOnMutationInDev(false)).not.toThrow();
expect(() => deepFreezeAndThrowOnMutationInDev(5)).not.toThrow();
expect(() => deepFreezeAndThrowOnMutationInDev()).not.toThrow();
__DEV__ = false;
expect(() => deepFreezeAndThrowOnMutationInDev('')).not.toThrow();
expect(() => deepFreezeAndThrowOnMutationInDev(null)).not.toThrow();
expect(() => deepFreezeAndThrowOnMutationInDev(false)).not.toThrow();
expect(() => deepFreezeAndThrowOnMutationInDev(5)).not.toThrow();
expect(() => deepFreezeAndThrowOnMutationInDev()).not.toThrow();
});
it('should throw on mutation in dev with strict', () => {
'use strict';
__DEV__ = true;
var o = {key: 'oldValue'};
deepFreezeAndThrowOnMutationInDev(o);
expect(() => { o.key = 'newValue'; }).toThrowError(
'You attempted to set the key `key` with the value `"newValue"` ' +
'on an object that is meant to be immutable and has been frozen.'
);
expect(o.key).toBe('oldValue');
});
it('should throw on mutation in dev without strict', () => {
__DEV__ = true;
var o = {key: 'oldValue'};
deepFreezeAndThrowOnMutationInDev(o);
expect(() => { o.key = 'newValue'; }).toThrowError(
'You attempted to set the key `key` with the value `"newValue"` ' +
'on an object that is meant to be immutable and has been frozen.'
);
expect(o.key).toBe('oldValue');
});
it('should throw on nested mutation in dev with strict', () => {
'use strict';
__DEV__ = true;
var o = {key1: {key2: {key3: 'oldValue'}}};
deepFreezeAndThrowOnMutationInDev(o);
expect(() => { o.key1.key2.key3 = 'newValue'; }).toThrowError(
'You attempted to set the key `key3` with the value `"newValue"` ' +
'on an object that is meant to be immutable and has been frozen.'
);
expect(o.key1.key2.key3).toBe('oldValue');
});
it('should throw on nested mutation in dev without strict', () => {
__DEV__ = true;
var o = {key1: {key2: {key3: 'oldValue'}}};
deepFreezeAndThrowOnMutationInDev(o);
expect(() => { o.key1.key2.key3 = 'newValue'; }).toThrowError(
'You attempted to set the key `key3` with the value `"newValue"` ' +
'on an object that is meant to be immutable and has been frozen.'
);
expect(o.key1.key2.key3).toBe('oldValue');
});
it('should throw on insertion in dev with strict', () => {
'use strict';
__DEV__ = true;
var o = {oldKey: 'value'};
deepFreezeAndThrowOnMutationInDev(o);
expect(() => { o.newKey = 'value'; })
.toThrowError('Can\'t add property newKey, object is not extensible');
expect(o.newKey).toBe(undefined);
});
it('should not throw on insertion in dev without strict', () => {
__DEV__ = true;
var o = {oldKey: 'value'};
deepFreezeAndThrowOnMutationInDev(o);
expect(() => { o.newKey = 'value'; }).not.toThrow();
expect(o.newKey).toBe(undefined);
});
it('should mutate and not throw on mutation in prod', () => {
'use strict';
__DEV__ = false;
var o = {key: 'oldValue'};
deepFreezeAndThrowOnMutationInDev(o);
expect(() => { o.key = 'newValue'; }).not.toThrow();
expect(o.key).toBe('newValue');
});
// This is a limitation of the technique unfortunately
it('should not deep freeze already frozen objects', () => {
'use strict';
__DEV__ = true;
var o = {key1: {key2: 'oldValue'}};
Object.freeze(o);
deepFreezeAndThrowOnMutationInDev(o);
expect(() => { o.key1.key2 = 'newValue'; }).not.toThrow();
expect(o.key1.key2).toBe('newValue');
});
it("shouldn't recurse infinitely", () => {
__DEV__ = true;
var o = {};
o.circular = o;
deepFreezeAndThrowOnMutationInDev(o);
});
});