From e55fbebf680bfdce8bb2709493f1f92c2922f900 Mon Sep 17 00:00:00 2001
From: Nyall Dawson <nyall.dawson@gmail.com>
Date: Sun, 26 Mar 2017 14:33:55 +1000
Subject: [PATCH] Add failing test to ensure that QgsAbstractGeometry.centroid
 result matches that of GEOS

It doesn't, and reveals the the QGIS native centroid calculation
is quite broken
---
 tests/src/python/test_qgsgeometry.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tests/src/python/test_qgsgeometry.py b/tests/src/python/test_qgsgeometry.py
index 957461dcf51..b19f3820511 100644
--- a/tests/src/python/test_qgsgeometry.py
+++ b/tests/src/python/test_qgsgeometry.py
@@ -4108,6 +4108,11 @@ class TestQgsGeometry(unittest.TestCase):
             self.assertTrue(compareWkt(result, exp, 0.00001),
                             "centroid: mismatch Expected:\n{}\nGot:\n{}\n".format(exp, result))
 
+            # QGIS native algorithms are bad!
+            if False:
+                result = QgsGeometry(input.geometry().centroid()).exportToWkt()
+                self.assertTrue(compareWkt(result, exp, 0.00001),
+                                "centroid: mismatch using QgsAbstractGeometry methods Input {} \n Expected:\n{}\nGot:\n{}\n".format(t[0], exp, result))
 
 if __name__ == '__main__':
     unittest.main()