[widget] Add a test for types of values we handle in style's size

tests/test_widget.py

@@ -1,16 +1,22 @@
+from contextlib import nullcontext as does_not_raise
+from decimal import Decimal
+
 import pytest
 
 from textual.css.errors import StyleValueError
+from textual.css.scalar import Scalar, Unit
 from textual.widget import Widget
 
 
 @pytest.mark.parametrize(
-    "set_val, get_val, style_str", [
+    "set_val, get_val, style_str",
+    [
         [True, True, "visible"],
         [False, False, "hidden"],
         ["hidden", False, "hidden"],
         ["visible", True, "visible"],
-    ])
+    ],
+)
 def test_widget_set_visible_true(set_val, get_val, style_str):
     widget = Widget()
     widget.visible = set_val
@@ -26,3 +32,29 @@ def test_widget_set_visible_invalid_string():
         widget.visible = "nope! no widget for me!"
 
     assert widget.visible
+
+
+@pytest.mark.parametrize(
+    "size_input, expectation",
+    [
+        (None, does_not_raise()),
+        (10, does_not_raise()),
+        (10.0, does_not_raise()),
+        (10.2, does_not_raise()),
+        (Scalar(100, Unit.CELLS, Unit.WIDTH), does_not_raise()),
+        (Scalar(10.2, Unit.CELLS, Unit.WIDTH), does_not_raise()),
+        ("10", does_not_raise()),
+        # And now for some common types we don't handle...
+        ("a", pytest.raises(StyleValueError)),
+        (list(), pytest.raises(StyleValueError)),
+        (tuple(), pytest.raises(StyleValueError)),
+        (dict(), pytest.raises(StyleValueError)),
+        (3.14j, pytest.raises(StyleValueError)),
+        (Decimal("3.14"), pytest.raises(StyleValueError)),
+    ],
+)
+def test_widget_style_size_can_accept_various_data_types(size_input, expectation):
+    widget = Widget()
+
+    with expectation:
+        widget.styles.width = size_input