Custom test without node using pure javascript

Hey, I just tried to create my own test function which kind of similar to the Jest library.
Have been testing for 5 statements below and yet to find any failure.
But for now, it only have 2 functional tests which is expect(value).toBe(other) and expect(value).toEqual(something).

Let me see what do you guys think about this kind of stuff. Is it worth it?

Below is the implementation of the tests

```
function check(current,other){
if(typeof other !== 'object' && typeof current !== 'object') return current === other;
let equal = false;
for(let prop in other){
if(current[prop] === undefined) throw new Error("FAILED");
equal = equal || check(current[prop],other[prop]);
}
if(!equal) throw new Error("FAILED");
return equal;
}

function test(comment,callback){
let error;
try{
//execute the tests;
callback();
}catch(e){
// Get the result whether it passed or failed
error = e.message;
}
console.log(comment,error === "FAILED" ? "FAILED" : "PASSED");
}

function expect(value){
this.toBe = function(other){
if(value !== other) throw new Error("FAILED");
}
this.toEqual = function(something){
check(value,something);
}
return this;
}

// The tests start HERE

test('Is 2+2 be 4?',() => {
expect(2 + 2).toBe(4); // returns : Is 2+2 be 4? PASSED
});

test('Is 2+3 be 4?',() => {
expect(2 + 3).toBe(4); // returns : Is 2+3 be 4? FAILED
});

test('Is {value:3*3} equal {value:9}?',() => {
expect({value:3*3}).toEqual({value:9}); // returns : Is {value:3*3} equal {value:9}? PASSED
});

test('Is {value:2*3} equal {value:9}?',() => {
expect({value:2*3}).toEqual({value:9}); // returns : Is {value:2*3} equal {value:9}? FAILED
});

test('Is {value:{arr:[6]}} equal {value:9}?',() => {
expect({value:{arr:[6]}}).toEqual({value:9}); // Is {value:{arr:[6]}} equal {value:9}? FAILED
});
```

この issue にはインラインの JavaScript テスト関数の実装が含まれていますが、リポジトリのファイル、テスト、エントリーポイントの名前は何も示されていません。まず、これをプロジェクトの機能にするべきかどうかを明確にし、その範囲を定義してください。完了には、合意された実装場所と、提案された動作に対するテストが必要です。

索引モデルが issue の本文から書いたものです。