test: use valid ALPN wire-format fixtures

Author: sankalpsthakur

test/parallel/test-tls-basic-validations.js

@@ -81,17 +81,19 @@ assert.throws(() => tls.createServer({ ticketKeys: Buffer.alloc(0) }), {
 });
 
 {
-  const buffer = Buffer.from('abcd');
+  const buffer = Buffer.from([3, 0x61, 0x62, 0x63]);
   const out = {};
   tls.convertALPNProtocols(buffer, out);
-  out.ALPNProtocols.write('efgh');
-  assert(buffer.equals(Buffer.from('abcd')));
-  assert(out.ALPNProtocols.equals(Buffer.from('efgh')));
+  out.ALPNProtocols.write('def', 1);
+  assert(buffer.equals(Buffer.from([3, 0x61, 0x62, 0x63])));
+  assert(out.ALPNProtocols.equals(Buffer.from([3, 0x64, 0x65, 0x66])));
 }
 
 {
-  const arrayBufferViewStr = 'abcd';
-  const inputBuffer = Buffer.from(arrayBufferViewStr.repeat(8), 'utf8');
+  const inputBuffer = Buffer.concat([
+    Buffer.from([31]),
+    Buffer.alloc(31, 0x61),
+  ]);
   for (const expectView of common.getArrayBufferViews(inputBuffer)) {
     const out = {};
     const expected = Buffer.from(expectView.buffer.slice(),