Add test for package integrity

conda/opencv/run_test.py

+import sys
+
+# couple of imports to see if packages are working
+import cv2
+import pkg_resources
+
+
+def test_pytorch():
+    import cv2
+    
+    print("opencv version: ", cv2.__version__)
+
+
+def _check_package(name, pyname=None):
+    """Checks if a Python package can be `require()`'d"""
+
+    pyname = pyname or name
+    print(f"Checking Python setuptools integrity for {name} (pyname: {pyname})")
+    pkg_resources.require(pyname)
+
+
+def test_setuptools_integrity():
+
+    _check_package('pytorch', 'torch')
+    _check_package('torchvision')
+
+
+# test if pytorch installation is sane
+test_pytorch()
+test_setuptools_integrity()
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