Fix test_from_rich_text in test_content.py.

Fix bug where `content.spans` was not being tested.

Autoformatting included: `uvx black tests/test_content.py`

Author: dan-zheng

tests/test_content.py

@@ -52,7 +52,10 @@ def test_from_rich_text():
     content = Content.from_rich_text(text)
     assert len(content) == 11
     assert content.plain == "Hello World"
-    assert [Span(start=0, end=5, style="red"), Span(start=6, end=11, style="blue")]
+    assert content.spans == [
+        Span(start=0, end=5, style="red"),
+        Span(start=6, end=11, style="blue"),
+    ]
 
 
 def test_styled():
@@ -136,6 +139,7 @@ def test_add() -> None:
     assert content.spans == [Span(0, 3, "red"), Span(4, 7, "blue")]
     assert content.cell_length == 7
 
+
 def test_radd() -> None:
     """Test reverse addition."""
     assert "foo" + Content("bar") == Content("foobar")
@@ -145,6 +149,7 @@ def test_radd() -> None:
     assert str(content) == "foo bar"
     assert content.spans == [Span(4, 7, "blue")]
 
+
 def test_from_markup():
     """Test simple parsing of content markup."""
     content = Content.from_markup("[red]Hello[/red] [blue]World[/blue]")