Stop parsing time as scalar

tests/test_css_parse.py

@@ -0,0 +1,44 @@
+import pytest
+from rich.color import Color, ColorType
+from rich.style import Style
+
+from textual.css.stylesheet import Stylesheet
+from textual.css.transition import Transition
+
+
+def test_parse_text():
+    css = """#some-widget {
+        text: on red;
+    }
+    """
+    stylesheet = Stylesheet()
+    stylesheet.parse(css)
+
+    rule = stylesheet.rules[0].styles
+
+    assert rule.text_style == Style()
+    assert rule.text_background == Color("red", type=ColorType.STANDARD, number=1)
+
+
+@pytest.mark.parametrize(
+    "duration, parsed_duration",
+    [["5.57s", 5.57],
+     ["0.5s", 0.5],
+     ["1200ms", 1.2],
+     ["0.5ms", 0.0005]],
+)
+def test_parse_transition(duration, parsed_duration):
+    css = f"""#some-widget {{
+        transition: offset {duration} in_out_cubic;
+    }}
+    """
+    stylesheet = Stylesheet()
+    stylesheet.parse(css)
+
+    rule = stylesheet.rules[0].styles
+
+    assert len(stylesheet.rules) == 1
+    assert len(stylesheet.rules[0].errors) == 0
+    assert rule.transitions == {
+        "offset": Transition(duration=parsed_duration, easing="in_out_cubic", delay=0.0)
+    }