test: clean up inappropriate language

PR-URL: https://github.com/nodejs/node/pull/17170
Reviewed-By: Alexey Orlenko <eaglexrlnk@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

test/parallel/test-child-process-stdio-big-write-end.js

@@ -30,7 +30,7 @@ switch (process.argv[2]) {
   case 'child':
     return child();
   default:
-    throw new Error('wtf?');
+    throw new Error('invalid');
 }
 
 function parent() {

test/parallel/test-process-exit-code.js

@@ -37,7 +37,7 @@ switch (process.argv[2]) {
   case undefined:
     return parent();
   default:
-    throw new Error('wtf');
+    throw new Error('invalid');
 }
 
 function child1() {

test/parallel/test-process-raw-debug.js

@@ -30,7 +30,7 @@ switch (process.argv[2]) {
   case undefined:
     return parent();
   default:
-    throw new Error(`wtf? ${process.argv[2]}`);
+    throw new Error(`invalid: ${process.argv[2]}`);
 }
 
 function parent() {

test/parallel/test-repl-syntax-error-handling.js

@@ -29,7 +29,7 @@ switch (process.argv[2]) {
   case undefined:
     return parent();
   default:
-    throw new Error('wtf');
+    throw new Error('invalid');
 }
 
 function parent() {

test/sequential/test-net-GH-5504.js

@@ -37,7 +37,7 @@ switch (process.argv[2]) {
   case 'server': return server();
   case 'client': return client();
   case undefined: return parent();
-  default: throw new Error('wtf');
+  default: throw new Error('invalid');
 }
 
 function server() {