littleReact/test/may-dom/shallow.spec.js

import {
    shallowEqual
} from '../../src/PureComponent'

describe('shallowEqual', function () {

    it('shallowEqual', async () => {
        expect(shallowEqual(1, 1)).toBe(true)
        // expect(shallowEqual(-0, +0)).toBe(false)
        expect(shallowEqual(NaN, NaN)).toBe(true)
        expect(shallowEqual({}, {})).toBe(true)
        // expect(shallowEqual({
        //     a: {}
        // }, {
        //     a: {}
        // })).toBe(false)
        expect(shallowEqual({
            a: 1,
            b: 2
        }, {
            a: 1,
            b: 2,
            c: 3,
            d: 4
        })).toBe(false)
        var b = {}
        expect(shallowEqual({
            a: b
        }, {
            a: b
        })).toBe(true)

        expect(shallowEqual([
            1, 2, 3
        ], [4, 5, 6])).toBe(false)

        expect(shallowEqual([
            1, 2, 3
        ], [1, 2, 3])).toBe(true)
    })
})