ENH: Add basic Python testing using existing regression baseline

Author: dzenanz

wrapping/test/CMakeLists.txt

@@ -0,0 +1,18 @@
+itk_python_expression_add_test(
+  NAME itkOpenSlideImageIOPythonInstantiationTest
+  EXPRESSION "io = itk.OpenSlideImageIO.New()"
+)
+
+set(test_input_dir ${CMAKE_CURRENT_SOURCE_DIR}/../../test/Input)
+# cmake_path(CONVERT ${test_input_dir} TO_CMAKE_PATH_LIST test_input_dir NORMALIZE)  # CMake 3.20+
+
+list(FIND ITK_WRAP_IMAGE_DIMS 2 wrap_2_index)
+if(wrap_2_index GREATER -1)
+  itk_python_add_test(NAME itkOpenSlideTestBasicIOPython
+    TEST_DRIVER_ARGS
+    --compare DATA{${test_input_dir}/CMU-1-Small-Region.mha} ${ITK_TEST_OUTPUT_DIR}/CMU-1-Small-Region-Python.mha
+    COMMAND convert_test.py
+      DATA{${test_input_dir}/CMU-1-Small-Region.svs}
+      ${ITK_TEST_OUTPUT_DIR}/CMU-1-Small-Region-Python.mha
+    )
+endif()

wrapping/test/convert_test.py

@@ -0,0 +1,5 @@
+import sys
+import itk
+
+image = itk.imread(sys.argv[1])
+itk.imwrite(image, sys.argv[2])