ENH: Adding Python test for itkPointsLocator

Modules/Registration/Common/wrapping/test/CMakeLists.txt

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+if(ITK_WRAP_PYTHON)
+  itk_python_add_test(NAME itkPointsLocatorPythonTest COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/itkPointsLocatorTest.py)
+endif()

Modules/Registration/Common/wrapping/test/itkPointsLocatorTest.py

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+# ==========================================================================
+#
+#   Copyright NumFOCUS
+#
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#          http://www.apache.org/licenses/LICENSE-2.0.txt
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+#
+# ==========================================================================
+
+# For testing itk PointsLocator in Python
+import itk
+
+# Create points on a plane
+pointset = itk.PointSet[itk.F, 3].New()
+pointset.SetPoint(0, [0, 0, 0])
+pointset.SetPoint(1, [0, 1, 0])
+pointset.SetPoint(2, [1, 0, 0])
+pointset.SetPoint(3, [1, 1, 0])
+
+# Create PointsLocator
+pl = itk.PointsLocator.New()
+pl.SetPoints(pointset.GetPoints())
+pl.Initialize()
+
+# Query tree for one point
+vl = itk.VectorContainer[itk.UL, itk.UL].New()
+pl.FindClosestNPoints(pointset.GetPoint(0), 3, vl)
+assert vl.Size() == 3
+assert vl.GetElement(0) == 0
+assert vl.GetElement(1) == 1
+assert vl.GetElement(2) == 2
+
+# Check points within radius
+pl.FindPointsWithinRadius(pointset.GetPoint(0), 2, vl)
+assert vl.Size() == 4
+
+pl.FindPointsWithinRadius(pointset.GetPoint(0), 1.1, vl)
+assert vl.Size() == 3
+assert vl.GetElement(0) == 0
+assert vl.GetElement(1) == 1
+assert vl.GetElement(2) == 2