Part: add unit test for PR #13507

src/Mod/Part/CMakeLists.txt

@@ -64,6 +64,7 @@ set(CompoundTools_Scripts
 
 set(Part_tests
     parttests/__init__.py
+    parttests/BRep_tests.py
     parttests/Geom2d_tests.py
     parttests/part_test_objects.py
     parttests/regression_tests.py

src/Mod/Part/TestPartApp.py

@@ -27,6 +27,7 @@ from FreeCAD import Units
 from FreeCAD import Base
 App = FreeCAD
 
+from parttests.BRep_tests import BRepTests
 from parttests.Geom2d_tests import Geom2dTests
 from parttests.regression_tests import RegressionTests
 from parttests.TopoShapeListTest import TopoShapeListTest

src/Mod/Part/parttests/BRep_tests.py

@@ -0,0 +1,26 @@
+import FreeCAD as App
+import Part
+
+import unittest
+
+class BRepTests(unittest.TestCase):
+
+    def testProject(self):
+        """
+        This is a unit test for PR #13507
+        """
+        num = 18
+        alt = [0,1] * num
+        pts = [App.Vector(i, alt[i], 0) for i in range(num)]
+
+        bsc = Part.BSplineCurve()
+        bsc.buildFromPoles(pts, False, 1)
+        edge = bsc.toShape()
+
+        rts = Part.RectangularTrimmedSurface(Part.Plane(), -50, 50, -50, 50)
+        plane_shape = rts.toShape()
+
+        proj = plane_shape.project([edge])
+        self.assertFalse(proj.isNull())
+        self.assertEqual(len(proj.Edges), 1)
+