Do not hardcode the number of edges

Author: adam-urbanczyk

tests/test_cadquery.py

@@ -5413,7 +5413,7 @@ def test_project(self):
         res = t.project(f, (0, 0, -1))
 
         assert res.isValid()
-        assert len(res.Edges()) == 8
+        assert len(res.Edges()) == len(t.Edges())
         assert t.distance(res) == approx(1)
 
         # extrude it