Make tests for the JSON Reader

[EatSleepProgramRepeat]

Make tests for the JSON reader as follows:

• Test edge cases:
  • Invalid JSON strings don't break constructor

  • For getReleases method:

    • Missing or null fields in the JSON
    • Empty releases array
    • Invalid or unexpected JSON structure

  • For getCDStubs method:

    • Missing or null fields in the JSON
    • Empty cdstubs array
    • Invalid or unexpected JSON structure

  • For createTableModel method:

    • Empty input arrays
    • Null input arrays
    • Invalid data in the input array

  • For getReleasesAsTableModel method:

    • Empty or null MusicBrainzRelease[]

  • For getCDStubsAsTableModel method:

    • Empty or null MusicBrainzCDStub[]

  • Error handling:

    • Invalid or unexpected JSON structures
    • Missing required fields in the JSON

You MAY make changes to other classes if deemed necessary.