Simplify the resolver zero division bug unit test

tests/test_resolve.py

@@ -128,24 +128,17 @@ def test_resolve_fraction_unit():
 def test_resolve_issue_2502():
     """Test https://github.com/Textualize/textual/issues/2502"""
 
-    widgets_fr = [Widget() for _ in range(50)]
+    widget = Widget()
-    widgets_min_width = [Widget() for _ in range(50)]
-
-    for widget in widgets_fr:
     widget.styles.width = "1fr"
-        widget.styles.min_width = 1
+    widget.styles.min_width = 11
-
-    for widget in widgets_min_width:
-        widget.styles.width = 0
-
-    styles = (
-        widget.styles
-        for widget in chain.from_iterable(zip(widgets_fr, widgets_min_width))
-    )
 
     assert isinstance(
         resolve_fraction_unit(
-            styles, Size(80, 24), Size(80, 24), Fraction(10), resolve_dimension="width"
+            (widget.styles,),
+            Size(80, 24),
+            Size(80, 24),
+            Fraction(10),
+            resolve_dimension="width",
         ),
         Fraction,
     )