[LAB2] 312552020

[martintl25]

Description

Update: Complete the code in main_test.js for testing main.js.

main_test.js implements a single testing function for each method defined in MailSystem and Application. As being initialized, an Application instance would create a MailSystem object as its class member.

Here is a list of the methods of 2 classes:

1. MailSystem.write(string)
2. MailSystem.send(string, string)
3. Application.getNames()
4. Application.getRandomPerson()
5. Application.selectNextPerson()
6. Application.notifySelected()

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[TaiYou-TW]

This PR looks okay for merge and grading.