[test] Add test suites

[t2ym]

[test] Add test suites

Tasks

• Test Toolchain (unit test on node)
  • Runner
    • CommonJS
    • ES Module
  • Instrumentation
  • Coverage
• Test Suites (unit test)
  • Demo Test Suite - copied from src/jsonclass.js to check the test toolchain
    • Assertions
    • Edge test cases
  • other test suites, TBD
• Test Toolchain (integration test)
  • TBD

Issues

• Async runners run (actually register test suites) concurrently, while they should be sequential