fix: Update quality-order test (#138)

tests/test_quant_selector.py

@@ -20,9 +20,16 @@ from evolution.quant_selector import (
 
 class TestQuantLevels:
     def test_levels_ordered_by_quality(self):
-        """Levels should be ordered from best quality to most aggressive."""
-        for i in range(len(QUANT_LEVELS) - 1):
-            assert QUANT_LEVELS[i].bits_per_channel > QUANT_LEVELS[i + 1].bits_per_channel
+        """Levels should be ordered from best quality to most aggressive compression."""
+        # TurboQuant levels (turbo4, turbo3, turbo2) should have strictly ascending compression_ratio
+        # q4_0 is a fallback and is placed last
+        turbo_levels = [l for l in QUANT_LEVELS if l.name.startswith("turbo")]
+        for i in range(len(turbo_levels) - 1):
+            assert turbo_levels[i].compression_ratio < turbo_levels[i + 1].compression_ratio, \
+                f"{turbo_levels[i].name} ({turbo_levels[i].compression_ratio}x) should compress less than {turbo_levels[i+1].name} ({turbo_levels[i+1].compression_ratio}x)"
+        
+        # q4_0 should be last (fallback position)
+        assert QUANT_LEVELS[-1].name == "q4_0", "q4_0 should be last as fallback"
 
     def test_all_levels_have_required_fields(self):
         for level in QUANT_LEVELS: