[qu2cuPen] Change stats

To count number of quadratic vs cubic segments.

Lib/fontTools/pens/qu2cuPen.py

@@ -51,7 +51,8 @@ class Qu2CuPen(ContourFilterPen):
     def _quadratics_to_curve(self, q):
         curves = quadratic_to_curves(q, self.max_err, all_cubic=self.all_cubic)
         if self.stats is not None:
-            n = str(len(curves))
+            for curve in curves:
+                n = str(len(curve))
                 self.stats[n] = self.stats.get(n, 0) + 1
         for curve in curves:
             if len(curve) == 4:

Tests/pens/qu2cuPen_test.py

@@ -86,8 +86,8 @@ class _TestPenMixin(object):
             self.convert_glyph(source, stats=stats)
 
         self.assertTrue(stats)
-        self.assertTrue("1" in stats)
-        self.assertEqual(type(stats["1"]), int)
+        self.assertTrue("4" in stats)
+        self.assertEqual(type(stats["4"]), int)
 
     def test_addComponent(self):
         pen = self.Pen()