chore(curriculum): test input and label are linked (#60909)

curriculum/challenges/english/25-front-end-development/lab-job-application-form/66faac4139dbbd5dd632c860.md

@@ -20,6 +20,7 @@ demoType: onClick
 1. You should have a `fieldset` element with class of `radio-group`.
 1. Inside `.radio-group` you should have a set of `input` elements with the type `radio` and relevant labels for selecting availability options (e.g., Full-Time, Part-Time). The group `name` should be `availability`.
 1. You should have a `textarea` element with the id `message` for entering a message.
+1. You should associate every `input` element with a `label` element. 
 1. You should have a `button` element with the type `submit` for submitting the form.
 1. Add a `:focus` pseudo-class to the `input` and `textarea` elements to change their border color when focused.
 1. The `input`, `select` and `textarea` elements should have an `:invalid` pseudo-class that changes the border color to red when invalid input is detected.
@@ -83,6 +84,18 @@ You should have a `textarea` element with the id `message` for entering a messag
 assert.isNotEmpty(document.querySelectorAll("div.container > form textarea#message"));
 ```
 
+You should associate every `input` element with a `label` element. 
+
+```js
+const els = document.querySelectorAll('input');
+assert.isNotEmpty(els);
+els.forEach(input => {
+  const label = document.querySelector(`label[for="${input.id}"]`) || input.parentElement;
+  assert.exists(label); 
+  assert.equal(label.tagName, "LABEL");
+})
+```
+
 You should have a `button` element with the type `submit` for submitting the form.
 
 ```js