Grids

Grid component integration tests for MgGridBase layout persistence, column rendering, and URL link functionality.

Key Files

TestMgGrid.cs -- Test infrastructure for grid testing:
- TestGridOrderItemDataSource -- DataSource with the 3-parameter constructor required by MgGridBase.OnInitializedAsync via Activator.CreateInstance.
- DynamicColumnAddingEventArgs -- Event args for customizing dynamically added columns.
- TestMgGridBase<...> -- Abstract generic test grid that overrides layout persistence with in-memory Dictionary storage and auto-builds columns from TDataItem properties via reflection.
- TestMgGridOrderItem -- Concrete test grid bound to TestOrderItem entities.
MgGridBaseTests.cs -- [TestClass] with tests for:
- Column width persistence across grid re-renders.
- Layout storage population after render.
- Separate layout keys for differently named grids.
- Master grid detection.
- Reflection-based column building (verifies Id, ProductName, Quantity columns).
- MgGridDataColumn.UrlLink rendering with token replacement.