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deepMerge.spec.js
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deepMerge.spec.js
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const { deepMerge } = require('./index');
describe('deepMerge:', () => {
test('should create new parent objects and copy siblings', () => {
// given
const obj = { a: {}, b: {} };
// when
const copy = deepMerge(obj, { b: { c: true } });
// then
expect(copy).toEqual({ a: {}, b: { c: true } });
expect(copy.a).toBe(obj.a);
expect(copy).not.toBe(obj);
expect(copy.b).not.toBe(obj.b);
});
test('should bot change arguments', () => {
// given
const a = { x: true };
const b = { x: false };
// when
deepMerge(a, b);
// then
expect(a).toEqual({ x: true });
expect(b).toEqual({ x: false });
});
test('should merge multiple objects', () => {
// when
const copy = deepMerge({ a: true }, { b: true }, { c: true });
// then
expect(copy).toEqual({ a: true, b: true, c: true });
});
test('should not merge arrays', () => {
// when
const copy = deepMerge({ a: ['x', 'y'] }, { a: ['z'] });
// then
expect(copy).toEqual({ a: ['z'] });
});
test('should not merge dates', () => {
// when
const copy = deepMerge({ a: new Date() }, { a: { b: true } });
// then
expect(copy).toEqual({ a: { b: true } });
});
test('should merge objects deeply', () => {
// when
const copy = deepMerge({ a: { b: { c: true } } }, { a: { b: { d: true } } });
// then
expect(copy).toEqual({ a: { b: { c: true, d: true } } });
});
test('should copy property from the first object if property is undefined in the second one', () => {
// when
const copy = deepMerge({ a: true }, { a: undefined });
// then
expect(copy).toEqual({ a: true });
});
test('should copy property from the first object if property is null in the second one', () => {
// when
const copy = deepMerge({ a: true }, { a: null });
// then
expect(copy).toEqual({ a: true });
});
test('should not copy property from the first object if property is false in the second one', () => {
// when
const copy = deepMerge({ a: true }, { a: false });
// then
expect(copy).toEqual({ a: false });
});
});