Testing to ensure layout can properly be set via view

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