83a6a6ea32
* chore: make aware eslint that we use jest By setting up the jest environment, we no longer need to declare the 'test' global in the configuration. * chore: don't need to import expect, it's a jest environment global * chore: don't need to import expect when creating undefined test
35 lines
714 B
JavaScript
35 lines
714 B
JavaScript
const {deepFreeze} = require('./_30s.js');
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test('deepFreeze is a Function', () => {
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expect(deepFreeze).toBeInstanceOf(Function);
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});
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test('modifying deeply freezed object prop throws an error in strict mode', () => {
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let freezedObj = deepFreeze({ a: 42 });
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expect(() => {
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'use strict';
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freezedObj.a = 24;
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}).toThrow();
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});
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test('should not modify deeply freezed object inside another object', () => {
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let freezedObj = deepFreeze({
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a: {
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b: 42
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}
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});
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freezedObj.a.b = 16;
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expect(freezedObj.a.b).toBe(42);
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});
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test('should not add prop to deeply freezed empty object', () => {
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let freezedObj = deepFreeze({});
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freezedObj.a = 42;
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expect(freezedObj).toEqual({});
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});
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