Added Year, Month, Week feature

[lhengl]

ADDITION

• Added Year class
• Added Month class
• Added Week class

UPDATES

• Updated date to support Year, Month, and Week
• Updated extensions to support Year, Month, and Week
• Added DateTime extension methods to mirror Date

UNIT TESTS

• added month_test.dart
• added week_test.dart
• added year_test.dart

[lhengl]

Hi Andrew,

As per #12 , I've been updating the package and using this code for a while on a local repository to work with individual units of time separately in a calendar app (year, month, week). I thought I'd share it with the community.

As per #12 I've added test cases as per your request.

Happy to discuss these new features with you, if you have any questions.

Heng.

[codecov]

Codecov Report

Patch coverage: 93.70% and project coverage change: +6.63 🎉

Comparison is base (6113c78) 89.71% compared to head (04c0558) 96.35%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #13      +/-   ##
==========================================
+ Coverage   89.71%   96.35%   +6.63%     
==========================================
  Files           7       11       +4     
  Lines         350      795     +445     
==========================================
+ Hits          314      766     +452     
+ Misses         36       29       -7     

Impacted Files	Coverage Δ
lib/src/extensions.dart	87.50% <87.03%> (-12.50%)	⬇️
lib/src/month.dart	91.56% <91.56%> (ø)
lib/src/year.dart	96.03% <96.03%> (ø)
lib/src/week.dart	96.51% <96.51%> (ø)
lib/src/date.dart	99.36% <100.00%> (+0.13%)	⬆️
lib/src/date_time_range.dart	100.00% <100.00%> (ø)
lib/src/time.dart	100.00% <100.00%> (+4.14%)	⬆️

... and 2 files with indirect coverage changes

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[AndrewPiterov]

Hi Heng,

Thanks for contribution and new features.

Let's add some more unit tests especially for extensions and time_range.

You can check locally which functions are not tested by commands below:

brew install lcov
flutter test --coverage
genhtml coverage/lcov.info -o coverage/html
open coverage/html

Thank you 🙏

[lhengl]

Hi @AndrewPiterov,

I finally got the time to write the additional tests (there were a lot, took me a whole weekend...). I added more tests for older features as well to qualify for the test coverage as per your request.

Hope you can approve. Cheers!

Heng.