test: use Number.isNaN()

PR-URL: #17319
Reviewed-By: Vse Mozhet Byt <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Daijiro Wachi <[email protected]>
Reviewed-By: Gireesh Punathil <[email protected]>
Reviewed-By: Jon Moss <[email protected]>
Reviewed-By: Khaidi Chu <[email protected]>
Reviewed-By: James M Snell <[email protected]>

test/parallel/test-process-emit.js

@@ -19,4 +19,4 @@ process.emit('normal', 'normalData');
 process.emit(sym, 'symbolData');
 process.emit('SIGPIPE', 'signalData');
 
-assert.strictEqual(isNaN(process._eventsCount), false);
+assert.strictEqual(Number.isNaN(process._eventsCount), false);