TT-4337: CRUDs calendar coverage

[googsvg]

Summary

• Audit of all 7 Nylas v3 Calendar API endpoints confirmed full coverage (list, find, create, update, destroy, getAvailability, getFreeBusy) — no
  implementation changes required
• Added comprehensive unit test coverage for all calendar request models and query params that were previously untested
• No production code changed; all existing behavior is backward compatible

What's covered

New test classes:

• CreateCalendarRequestTests — serialization round-trip (all fields + name-only), Builder (full + minimal)
• UpdateCalendarRequestTests — serialization round-trip (all fields + all-null), Builder (full + empty)
• ListCalendarsQueryParamsTests — Builder (all fields + all-null)

Additions to existing test classes:

• CrudTests — added query params propagation test for list; added assertNull assertions to list (no params) and find to verify null is correctly
  passed through
• OtherMethodTests — added getAvailability test covering roundTo field (the non-deprecated replacement for roundTo30Minutes)

Test results

31 tests passing, 0 failures

License

I confirm that this contribution is made under the terms of the MIT license and that I have the authority necessary to make this contribution on behalf of its copyright owner.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.47%. Comparing base (ded101e) to head (565ad04).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #315   +/-   ##
=========================================
  Coverage     82.47%   82.47%           
  Complexity      357      357           
=========================================
  Files            37       37           
  Lines          1027     1027           
  Branches         95       95           
=========================================
  Hits            847      847           
  Misses          121      121           
  Partials         59       59           

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