add repro for clipped clip-box with reflection

reproduces #335
googlefonts · Sep 20, 2021 · 06eb86a · 06eb86a
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diff --git a/tests/flipped_reused_shape.svg b/tests/flipped_reused_shape.svg
diff --git a/tests/write_font_test.py b/tests/write_font_test.py
@@ -312,6 +312,16 @@ def test_write_font_binary(svgs, expected_ttx, config_overrides):
             {},
             None,
         ),
+        (
+            # this SVG contains two triangles flipped vertically around the middle,
+            # with each triangle's bbox half-viewbox wide; the union of their bboxes
+            # encompasses the full extent of the upem/viewbox.
+            # Reflection may play tricks if the bbox doesn't get normalized, cf.
+            # https://github.com/googlefonts/nanoemoji/issues/335
+            ("flipped_reused_shape.svg",),
+            {},
+            (0, 0, 100, 100),
+        ),
     ],
 )
 def test_ufo_color_base_glyph_bounds(svgs, config_overrides, expected):