Introducing columns formulas

tests/core/formatting/test_engine.py

@@ -243,7 +243,7 @@ class TestConflictResolution:
         css, formatted = engine.apply_format(rules, cell_value=150, row_data=row_data)
 
         assert isinstance(css, StyleContainer)
-        assert "var(--color-secondary)" in css.css  # Style from Rule 2
+        assert css.cls == "mf-formatting-secondary"  # Style from Rule 2
         assert formatted == "150.00 €"  # Formatter from Rule 1
 
         # Case 2: Condition not met (value <= budget)
@@ -282,7 +282,7 @@ class TestConflictResolution:
 
         css, formatted = engine.apply_format(rules, cell_value=-5.67)
 
-        assert "var(--color-error)" in css.css  # Rule 3 wins for style
+        assert css.cls == "mf-formatting-error"  # Rule 3 wins for style
         assert formatted == "-6 €"  # Rule 4 wins for formatter (precision=0)
 
 
@@ -316,7 +316,7 @@ class TestWithRowData:
         css, _ = engine.apply_format(rules, cell_value=42, row_data=row_data)
 
         assert isinstance(css, StyleContainer)
-        assert "background-color" in css.css
+        assert css.cls == "mf-formatting-error"
 
 
 class TestPresets:
@@ -327,7 +327,7 @@ class TestPresets:
 
         css, _ = engine.apply_format(rules, cell_value=42)
 
-        assert "var(--color-success)" in css.css
+        assert css.cls == "mf-formatting-success"
 
     def test_formatter_preset(self):
         """Formatter preset is resolved correctly."""