From 5235af1d47fb88aa334f66f7630f5b948b70bb14 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Wed, 6 Oct 2021 21:58:37 +0200
Subject: [PATCH] Mesh: [skip ci] add unit test for corrupted facets

---
 src/Mod/Mesh/App/MeshTestsApp.py | 37 ++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/src/Mod/Mesh/App/MeshTestsApp.py b/src/Mod/Mesh/App/MeshTestsApp.py
index 29093823c8..a43f982e79 100644
--- a/src/Mod/Mesh/App/MeshTestsApp.py
+++ b/src/Mod/Mesh/App/MeshTestsApp.py
@@ -47,6 +47,43 @@ class MeshTopoTestCases(unittest.TestCase):
         planarMeshObject = Mesh.Mesh(self.planarMesh)
         planarMeshObject.collapseFacets(range(18))
 
+    def testCorruptedFacet(self):
+        v = FreeCAD.Vector
+        mesh = Mesh.Mesh()
+        mesh.addFacet(
+        v(1.0e1, -1.0e1, 1.0e1),
+        v(1.0e1, +1.0e1, 1.0e1),
+        v(0.0e0, 0.0e0, 1.0e1))
+
+        mesh.addFacet(
+        v(-1.0e1, -1.0e1, 1.0e1),
+        v(-1.0e1, +1.0e1, 1.0e1),
+        v(0e0, 0.0e0, 1.0e1))
+
+        mesh.addFacet(
+        v(+1.0e1, +1.0e1, 1.0e1),
+        v(-1.0e1, +1.0e1, 1.0e1),
+        v(.0e0, 0.0e0, 1.0e1))
+
+        mesh.addFacet(
+        v(+1.0e1, -1.0e1, 1.0e1),
+        v(-1.0e1, -1.0e1, 1.0e1),
+        v(.0e0, 0.0e0, 1.0e1))
+
+        mesh.addFacet(
+        v(-1.0e1, +1.0e1, 1.0e1),
+        v(+1.0e1, +1.0e1, 1.0e1),
+        v(+1.0e1, +1.0e1, 1.0e1))
+
+        mesh.addFacet(
+        v(+1.0e1, +1.0e1, 1.0e1),
+        v(+1.0e1, 00.0e1, 1.0e1),
+        v(+1.0e1, -1.0e1, 1.0e1))
+
+        self.assertEqual(mesh.CountFacets, 6)
+        mesh.fixIndices()
+        self.assertEqual(mesh.CountFacets, 5)
+
 
 class MeshSplitTestCases(unittest.TestCase):
     def setUp(self):