fix(curriculum): limit hardcoding roman numerals (#54819)

curriculum/challenges/english/15-javascript-algorithms-and-data-structures-22/build-a-roman-numeral-converter-project/build-a-roman-numeral-converter.md

@@ -170,6 +170,34 @@ convertBtnEl.click();
 assert.strictEqual(outputEl.innerText.trim(), 'MMMCMXCIX');
 ```
 
+When the `#number` element contains a random negative number and the `#convert-btn` element is clicked, the `#output` element should contain the text `"Please enter a number greater than or equal to 1"`.
+
+```js
+const numberInputEl = document.getElementById('number');
+const convertBtnEl = document.getElementById('convert-btn');
+const outputEl = document.getElementById('output');
+
+const randomNegativeNumber = Math.floor(Math.random() * -4000) - 2; 
+
+numberInputEl.value = randomNegativeNumber;
+convertBtnEl.click();
+assert.strictEqual(outputEl.innerText.trim().replace(/[.,?!]+$/g, '').toLowerCase(), 'please enter a number greater than or equal to 1');
+```
+
+When the `#number` element contains a number greater than 4000 and the `#convert-btn` element is clicked, the `#output` element should contain the text `"Please enter a number less than or equal to 3999"`.
+
+```js
+const numberInputEl = document.getElementById('number');
+const convertBtnEl = document.getElementById('convert-btn');
+const outputEl = document.getElementById('output');
+
+const randomBigNumber = Math.floor(Math.random() * (1000000)) + 4000; 
+
+numberInputEl.value =  randomBigNumber;
+convertBtnEl.click();
+assert.strictEqual(outputEl.innerText.trim().replace(/[.,?!]+$/g, '').toLowerCase(), 'please enter a number less than or equal to 3999');
+```
+
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