test: remove error messages in test-buffer-alloc

PR-URL: #15867
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

Author: bwhitty

test/parallel/test-buffer-alloc.js

@@ -309,12 +309,12 @@ assert.strictEqual('TWFu', (Buffer.from('Man')).toString('base64'));
   assert.strictEqual(quote, b.toString('ascii', 0, quote.length));
 
   // check that the base64 decoder ignores whitespace
-  const expectedWhite = expected.slice(0, 60) + ' \n' +
-                        expected.slice(60, 120) + ' \n' +
-                        expected.slice(120, 180) + ' \n' +
-                        expected.slice(180, 240) + ' \n' +
-                        expected.slice(240, 300) + '\n' +
-                        expected.slice(300, 360) + '\n';
+  const expectedWhite = `${expected.slice(0, 60)} \n` +
+                        `${expected.slice(60, 120)} \n` +
+                        `${expected.slice(120, 180)} \n` +
+                        `${expected.slice(180, 240)} \n` +
+                        `${expected.slice(240, 300)}\n` +
+                        `${expected.slice(300, 360)}\n`;
   b = Buffer.allocUnsafe(1024);
   bytesWritten = b.write(expectedWhite, 0, 'base64');
   assert.strictEqual(quote.length, bytesWritten);