Use cooler way to get currentTest

import { State } from "./state.mjs"

import { pooltest, practice } from "./exercises.mjs"

import * as exercises from "./exercises.mjs"

import { createExerciseCard, displayAsSolved, displayAsNonCurrent, displayAsCurrent } from "./exercises.cards.mjs"

import { Exercise } from "./exercises.api.mjs"

}

export function main() {

    currentTest = {

        "pooltest": pooltest,

        "practice": practice

    }[new URLSearchParams(location.search).get("id")]

    currentTest = exercises[new URLSearchParams(location.search).get("id")]

    if(currentTest === undefined) {

        // When no test can be loaded, redirect to a URL which leads to a known existing test