JSFiddle - React, Tailwind, and code Playground

HTML

<button>Test!</button>

JavaScript

function testall(){
  var sizes = [10,100,1000,2000,3000,4000,5000,10000, 50000];
  for (var i = 0; i < sizes.length; i++) {
    var n = sizes[i];
    if(!testhash(n)){
        alert("test failed at hash of length: " + n);
        return
    }
  }
  alert("all tests passed");  
}

function testhash(n){
    var somestring = "#" + makestring(n);
    window.location.hash = somestring; 
    var success = (window.location.hash == somestring); 
    return success
}    

function makestring(n){
    var text = "";
    var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

    for( var i=0; i < n; i++ ){
        text += possible.charAt(Math.floor(Math.random() * possible.length));
    }
    return text;
}

$("button").on("click", testall);