test(winrtgen): improve coverage

[halildurmus]

Description

Related Issue

Type of Change

• [ ] ✨ feat -- New feature (non-breaking change which adds functionality)
• [ ] 🛠️ fix -- Bug fix (non-breaking change which fixes an issue)
• [ ] ❌ ! -- Breaking change (fix or feature that would cause existing functionality to change)
• [ ] 🧹 refactor -- Code refactor
• [ ] ✅ ci -- Build configuration change
• [ ] 📝 docs -- Documentation
• [x] 🧪 test -- Test
• [ ] 🗑️ chore -- Chore

[codecov[bot]]

Codecov Report

Merging #352 (d2ee8e2) into main (61ab05c) will increase coverage by 27.32%. Report is 1 commits behind head on main. The diff coverage is 68.75%.

@@             Coverage Diff             @@
##             main     #352       +/-   ##
===========================================
+ Coverage   68.30%   95.62%   +27.32%     
===========================================
  Files         113       45       -68     
  Lines        5568     2514     -3054     
===========================================
- Hits         3803     2404     -1399     
+ Misses       1765      110     -1655     

Files Changed	Coverage Δ
...inrtgen/lib/src/exceptions/winrtgen_exception.dart	33.33% <ø> (ø)
...ackages/winrtgen/lib/src/extensions/base_type.dart	100.00% <ø> (ø)
...ackages/winrtgen/lib/src/extensions/parameter.dart	100.00% <ø> (+9.09%)	:arrow_up:
packages/winrtgen/lib/src/models/json.dart	100.00% <ø> (+10.00%)	:arrow_up:
...kages/winrtgen/lib/src/models/projection_kind.dart	91.48% <ø> (ø)
...ackages/winrtgen/lib/src/models/type_arg_kind.dart	100.00% <ø> (+0.67%)	:arrow_up:
...es/winrtgen/lib/src/models/winrt_docs_service.dart	85.71% <ø> (+3.57%)	:arrow_up:
.../winrtgen/lib/src/models/winrt_metadata_store.dart	100.00% <ø> (ø)
...inrtgen/lib/src/projections/generic_interface.dart	98.01% <ø> (ø)
packages/winrtgen/lib/src/projections/getter.dart	88.00% <ø> (ø)
... and 12 more

... and 74 files with indirect coverage changes

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