[ModelsTreeVisibilityHandler.test.ts](https://github.com/iTwin/viewer-components-react/blob/tree-widget/next/packages/itwin/tree-widget/src/test/trees/models-tree/internal/ModelsTreeVisibilityHandler.test.ts), [CategoriesTreeVisibilityHandler.test.ts](https://github.com/iTwin/viewer-components-react/blob/tree-widget/next/packages/itwin/tree-widget/src/test/trees/categories-tree/internal/CategoriesTreeVisibilityHandler.test.ts) and [ClassificationsTreeVisibilityHandler.test.ts](https://github.com/iTwin/viewer-components-react/blob/tree-widget/next/packages/itwin/tree-widget/src/test/trees/classifications-tree/ClassificationsTreeVisibilityHandler.test.ts) are getting quite large. It is getting difficult to see what tests exists and takes a few seconds just to save those files. The tests should be split up (not only by tree type), so it is easier to work with them.
ModelsTreeVisibilityHandler.test.ts, CategoriesTreeVisibilityHandler.test.ts and ClassificationsTreeVisibilityHandler.test.ts are getting quite large. It is getting difficult to see what tests exists and takes a few seconds just to save those files.
The tests should be split up (not only by tree type), so it is easier to work with them.