Adding vitest for testing

Currently implemented

- FormatBytes
- MathHelpers

build/test.html

@@ -13,6 +13,29 @@
 </div>
 </body>
 <script languagae="JavaScript">
+
+/**
+ * converts a int number into bytes with prefix in two decimals precision
+ * currently precision is fixed, if dynamic needs check for max/min precision
+ * @param  {Number|BigInt} bytes bytes in int
+ * @return {String}       string in GB/MB/KB
+ */
+function _formatBytes(bytes)
+{
+	var i = -1;
+	// If this ia bigint -> convert to number, we need the decimals
+	if (typeof bytes === "bigint") {
+		bytes = Number(bytes);
+	}
+	do {
+		bytes = bytes / 1024;
+		i++;
+	} while (bytes > 99);
+	return (
+		Math.round(bytes * Math.pow(10, 2)) / Math.pow(10, 2)
+	) + ['kB', 'MB', 'GB', 'TB', 'PB', 'EB'][i];
+}
+
 document.addEventListener('DOMContentLoaded', function() {
 	console.log('JavaScript Utils Test');
 	let el = document.getElementById('test-div');
@@ -24,9 +47,15 @@ document.addEventListener('DOMContentLoaded', function() {
 	el.innerHTML = '';
 	el.innerHTML += '<div>randomIdF: ' + randomIdF() + '</div>';
 	el.innerHTML += '<div>getWindowSize: ' + JSON.stringify(getWindowSize()) + '</div>';
+	el.innerHTML += '<div>roundPrecision: ' + roundPrecision(10.1234, 2) + '</div>';
+	el.innerHTML += '<div>getRandomIntInclusive: ' + getRandomIntInclusive(1, 5) + '</div>';
 	el.innerHTML += '<div>formatBytes: ' + formatBytes(bytes) + '</div>';
 	el.innerHTML += '<div>formatBytesLong: ' + formatBytesLong(bytes) + '</div>';
 
+	// el.innerHTML += '<div>_formatBytes: ' + _formatBytes(1024n) + '</div>';
+	el.innerHTML += '<div>_formatBytes: ' + _formatBytes(1021152n) + '</div>';
+	el.innerHTML += '<div>_formatBytes: ' + _formatBytes(1021152) + '</div>';
+
 	// console.log('TR: %s', l10n.__('Original'));
 	// console.log('TR: %s', l10n.__('Not exists'));
 });