improve tests (#2923)

use es6 syntax in all tests, split weather tests, remove callbacks

tests/e2e/mock-console.js

@@ -3,13 +3,13 @@
  *
  * @param {string} err The error message.
  */
-function mockError(err) {
+const mockError = (err) => {
 	if (err.includes("ECONNREFUSED") || err.includes("ECONNRESET") || err.includes("socket hang up") || err.includes("exports is not defined") || err.includes("write EPIPE")) {
 		jest.fn();
 	} else {
 		console.dir(err);
 	}
-}
+};
 
 global.console = {
 	log: jest.fn(),