From 283e704d4ee4d59462cba8ab7f19723c5b9395b3 Mon Sep 17 00:00:00 2001
From: Simon Cozens <simon@simon-cozens.org>
Date: Wed, 13 Oct 2021 15:47:21 +0100
Subject: [PATCH] Add extrema test

---
 tests/filters/addExtrema_test.py | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 tests/filters/addExtrema_test.py

diff --git a/tests/filters/addExtrema_test.py b/tests/filters/addExtrema_test.py
new file mode 100644
index 000000000..f1e751108
--- /dev/null
+++ b/tests/filters/addExtrema_test.py
@@ -0,0 +1,24 @@
+from ufo2ft.filters.addExtrema import AddExtremaFilter
+
+
+class AddExtremaFilterTest:
+    def test_add_extrema_O(self, FontClass):
+        ufo = FontClass()
+        a = ufo.newGlyph("O")
+        a.width = 300
+        pen = a.getPen()
+        pen.moveTo((150, 0))
+        pen.curveTo((249, 0), (249, 150), (150, 150))
+        pen.curveTo((52, 150), (52, 0), (150, 0))
+        pen.closePath()
+
+        contour = ufo["O"][0]
+        assert len(contour) == 6
+
+        filter_ = AddExtremaFilter()
+
+        assert filter_(ufo)
+
+        contour = ufo["O"][0]
+        assert len(contour) == 12
+        ufo.save("t.ufo")