test: use string instead of RegExp in split()

PR-URL: https://github.com/nodejs/node/pull/13710
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

test/parallel/test-http-outgoing-first-chunk-singlebyte-encoding.js

@@ -24,7 +24,7 @@ for (const enc of ['utf8', 'utf16le', 'latin1', 'UTF-8']) {
       const headerEnd = received.indexOf('\r\n\r\n', 'utf8');
       assert.notStrictEqual(headerEnd, -1);
 
-      const header = received.toString('utf8', 0, headerEnd).split(/\r\n/);
+      const header = received.toString('utf8', 0, headerEnd).split('\r\n');
       const body = received.toString(enc, headerEnd + 4);
 
       assert.strictEqual(header[0], 'HTTP/1.1 200 OK');

test/parallel/test-repl-setprompt.js

@@ -23,6 +23,6 @@ child.stdin.end(`e.setPrompt("${p}");${os.EOL}`);
 child.on('close', function(code, signal) {
   assert.strictEqual(code, 0);
   assert.ok(!signal);
-  const lines = data.split(/\n/);
+  const lines = data.split('\n');
   assert.strictEqual(lines.pop(), p);
 });

test/parallel/test-stdin-script-child.js

@@ -18,7 +18,7 @@ child.stdout.on('data', function(c) {
 
 child.stderr.setEncoding('utf8');
 child.stderr.on('data', function(c) {
-  console.error(`> ${c.trim().split(/\n/).join('\n> ')}`);
+  console.error(`> ${c.trim().split('\n').join('\n> ')}`);
 });
 
 child.on('close', common.mustCall(function(c) {