Add unit test case for DataGridView 16 events

[John-Qiao]

related #10453

Proposed changes

• Add unit tests for below 16 events

1. ColumnHeadersBorderStyleChanged
2. ColumnHeadersDefaultCellStyleChanged
3. DataMemberChanged
4. DataSourceChanged
5. DefaultCellStyleChanged
6. EditModeChanged
7. GridColorChanged
8. MultiSelectChanged
9. ReadOnlyChanged
10. RowHeadersBorderStyleChanged
11. RowHeadersDefaultCellStyleChanged
12. RowsDefaultCellStyleChanged
13. CurrentCellChanged
14. CurrentCellDirtyStateChanged
15. SelectionChanged
16. Sorted

Microsoft Reviewers: Open in CodeFlow

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.50645%. Comparing base (566bec4) to head (7d0a6ca).

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main      #11556         +/-   ##
===================================================
+ Coverage   74.48439%   74.50645%   +0.02205%     
===================================================
  Files           3039        3039                 
  Lines         629066      629324        +258     
  Branches       46834       46834                 
===================================================
+ Hits          468556      468887        +331     
+ Misses        157154      157063         -91     
- Partials        3356        3374         +18     

Flag	Coverage Δ
Debug	74.50645% <100.00000%> (+0.02205%)	⬆️
integration	17.88990% <ø> (-0.08859%)	⬇️
production	47.37462% <ø> (+0.02631%)	⬆️
test	96.97293% <100.00000%> (+0.00169%)	⬆️
unit	44.50334% <ø> (+0.16523%)	⬆️

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[SimonZhao888]

LGTM!