# 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.