test: add asserts to validate test assumptions

Refs: #54968 Refs: #53382 Add additional asserts as suggestd by Richard in: #54968 Signed-off-by: Michael Dawson <midawson@redhat.com> PR-URL: #54997 Reviewed-By: Richard Lau <rlau@redhat.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: mhdawson

test/parallel/test-tls-cert-regression.js

@@ -22,6 +22,7 @@
 'use strict';
 const common = require('../common');
 const fixtures = require('../common/fixtures');
+const assert = require('assert');
 
 if (!common.hasCrypto)
  common.skip('missing crypto');
@@ -43,6 +44,8 @@ while (cert[cert.length - 1 - i] === 0x0a) i++;
 if (i !== 0) cert = cert.slice(0, cert.length - i);
 
 function test(cert, key, cb) {
+ assert.notStrictEqual(cert.at(-1), 0x0a);
+ assert.notStrictEqual(key.at(-1), 0x0a);
  const server = tls.createServer({
  cert,
  key