test: simplify output handling in repl tests

Replace .map() + .replace().trim() with a single .replace().

PR-URL: #11124
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Italo A. Casas <me@italoacasas.com>

Author: Trott

test/known_issues/test-repl-require-context.js

@@ -19,9 +19,7 @@ outputStream.setEncoding('utf8');
 outputStream.on('data', (data) => output += data);
 
 r.on('exit', common.mustCall(() => {
-  const results = output.split('\n').map((line) => {
-    return line.replace(/\w*>\w*/, '').trim();
-  });
+  const results = output.replace(/^> /mg, '').split('\n');
 
   assert.deepStrictEqual(results, ['undefined', 'true', 'true', '']);
 }));

test/parallel/test-repl-require-context.js

@@ -14,10 +14,7 @@ child.stdout.on('data', (data) => {
 });
 
 child.on('exit', common.mustCall(() => {
-  const results = output.split('\n').map((line) => {
-    return line.replace(/\w*>\w*/, '').trim();
-  });
-
+  const results = output.replace(/^> /mg, '').split('\n');
   assert.deepStrictEqual(results, ['undefined', 'true', 'true', '']);
 }));