JSTEP-10: Unify testing structure/tools

[JooHyukKim]

This issue serves as an umbrella issue for resolving [JSTEP-10: Unifying testing structure/tools]

TODO

• Add JUnit 5 dep + failing test utils
  • [ JSTEP-10 ] Add test dependencies #524
• Migrate modules to JUnit 5
  • [ JSTEP-10 ] Migrate csv module tests to JUnit 5 #525
  • [ JSTEP-10 ] Migrate properties module tests to JUnit 5 #526
  • [ JSTEP-10 ] Migrate toml module tests to JUnit 5 #527
  • [ JSTEP-10 ] Migrate yaml module tests to JUnit 5  #528
• Migrate failing tests to /tofix and remove existing /failing funciontality
  • [ JSTEP-10 ] Migrate failing tests to tofix #529
• Remove JUnit 4
  • [ JSTEP-10 ] Remove JUnit4 #530

[JooHyukKim]

Here also, can we open this one up again? I made a mistake above PRs resolve this. Changed to "related"

[cowtowncoder]

Re-opened. At this point all tests converted to JUnit 5: what remains is conversion from "failing" to "tofix" tests, I think.

[JooHyukKim]

Yup, just filed the last missing pieces #529 and #530

[cowtowncoder]

Completed, closing!