Testing to ensure layout can properly be set via view

src/textual/css/_style_properties.py

@@ -30,9 +30,9 @@ from .transition import Transition
 from ..geometry import Spacing, SpacingDimensions
 
 if TYPE_CHECKING:
+    from ..layout import Layout
     from .styles import Styles
     from .styles import DockGroup
-    from ..layout import Layout
     from ..layouts.factory import LayoutName
 
 
@@ -313,7 +313,7 @@ class LayoutProperty:
             layout (LayoutName | Layout): The layout to use. You can supply a ``LayoutName``
                 (a string literal such as ``"dock"``) or a ``Layout`` object.
         """
-        from ..layouts.factory import get_layout  # Prevents circular import
+        from ..layouts.factory import get_layout, Layout  # Prevents circular import
 
         obj.refresh(True)
         if isinstance(layout, Layout):

tests/test_view.py

@@ -0,0 +1,18 @@
+import pytest
+
+from textual.layouts.dock import DockLayout
+from textual.layouts.grid import GridLayout
+from textual.layouts.vertical import VerticalLayout
+from textual.view import View
+
+
+@pytest.mark.parametrize("layout_name, layout_type", [
+    ["dock", DockLayout],
+    ["grid", GridLayout],
+    ["vertical", VerticalLayout],
+])
+def test_view_layout_get_and_set(layout_name, layout_type):
+    view = View()
+    view.layout = layout_name
+    assert type(view.layout) is layout_type
+    assert view.styles.layout is view.layout