diff -r 464f5e8d57ab -r 7a7c237a1717 tests/quadrilaterals.py
--- a/tests/quadrilaterals.py	Wed Jan 31 15:19:31 2018 +0200
+++ b/tests/quadrilaterals.py	Wed Jan 31 15:58:38 2018 +0200
@@ -58,10 +58,6 @@
                 if cross_product(b - a, c - a).length() < 1e-5:
                     yield error(element, 'collinearity-error')
 
-def hair_score(smallest_angle):
-    from math import log10
-    return max(0, -log10(smallest_angle))
-
 def hair_test(model):
     for element in model.body:
         if hasattr(element, 'geometry') and len(element.geometry.vertices) >= 3: