Node.js: "this" inside a constructor function

Everywhere I read people say "this" inside a function is the global object, "this" outside a function is the module.exports, and "this" inside an arrow function is an empty object.

But it's not exactly like that inside an instanced function, is it? For example:

function Test() {
    this.arrowThis = () => {
        console.log(this)
    }

    console.log(this)
}

const test = new Test
console.log(test.arrowThis())

When the function is being instanced the "this" output is the function itself and when the .arrowThis() arrow function is being called the output are 2 values, one value is the instanced function and the other is an empty object.

I am having dificulties to understand the logic behind it. Could anyone here try to explain exactly what is the behavior of "this" in this case?