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
});
```

该 issue 包含一个内联的 JavaScript 测试函数实现，但没有指明任何 repository 文件、测试或入口点。首先需要明确这是否应成为项目功能，并定义其范围；要完成此工作，需要就实现位置达成一致，并为提议的行为编写测试。

由索引模型根据 Issue 内容生成。