const bind = require('../src/index.js')

test1('fn.bind 能用')

test2('this.bind 能用')

test3('this, p1, p2 能用')

test4('this, p1 绑定成功后传 p2 成功')

test5('new 的时候，绑定了 p1, p2')

test6('new 的时候，绑定了 p1, p2, 并且 fn 有 prototype')

test7('不用 new 但是用类似的对象')

function test1(message) {

Function.prototype.bind2 = bind

console.assert(Function.prototype.bind2 !== undefined)

console.log(message)

}

function test2(message) {

Function.prototype.bind2 = bind

const fn1 = function () {

return this

}

const newFn1 = fn1.bind2({ name: 'Jack' })

console.assert(newFn1().name === 'Jack')

console.log(message)

}

function test3(message) {

Function.prototype.bind2 = bind

const fn2 = function (p1, p2) {

return [this, p1, p2]

}

const newFn2 = fn2.bind({ name: 'Jack' }, 123, 456)

console.assert(newFn2()[0].name === 'Jack')

console.assert(newFn2()[1] === 123)

console.assert(newFn2()[2] === 456)

console.log(message)

}

function test4(message) {

Function.prototype.bind2 = bind

const fn2 = function (p1, p2) {

return [this, p1, p2]

}

const anotherFn2 = fn2.bind({ name: 'Jack' }, 123)

console.assert(anotherFn2(456)[0].name === 'Jack')

console.assert(anotherFn2(456)[1] === 123)

console.assert(anotherFn2(456)[2] === 456)

console.log(message)

}

function test5(message) {

Function.prototype.bind2 = bind

const fn = function (p1, p2) {

this.p1 = p1

this.p2 = p2

}

const fn2 = fn.bind2(undefined, 'x', 'y')

const object = new fn2()

console.assert(object.p1 === 'x', 'x')

console.assert(object.p2 === 'y', 'y')

console.log(message)

}

function test6(message) {

Function.prototype.bind2 = bind

const fn = function (p1, p2) {

this.p1 = p1

this.p2 = p2

}

fn.prototype.sayHi = function () { }

const fn2 = fn.bind2(undefined, 'x', 'y')

const object = new fn2()

console.assert(object.p1 === 'x', 'x')

console.assert(object.p2 === 'y', 'y')

console.assert(object.__proto__ === fn.prototype)

console.assert(typeof object.sayHi === 'function')

console.log(message)

}

function test7(message) {

Function.prototype.bind2 = bind;

const fn = function (p1, p2) {

this.p1 = p1;

this.p2 = p2;

};

fn.prototype.sayHi = function () { };

const object1 = new fn("a", "b");

const fn2 = fn.bind2(object1, "x", "y");

const object = fn2(); // 没有new

console.assert(object === undefined, "object 为空");

console.assert(object1.p1 === "x", "x");

console.assert(object1.p2 === "y", "y");

console.log(message)

}