Always skipping pystencils.autodiff in pytest (not only on 'CI')

conftest.py

@@ -33,6 +33,8 @@ add_path_to_ignore('pystencils_tests/benchmark')
 add_path_to_ignore('_local_tmp')
 
 
+collect_ignore += [os.path.join(SCRIPT_FOLDER, "pystencils/autodiff.py")]
+
 try:
     import pycuda
 except ImportError:

pystencils/autodiff.py

@@ -8,7 +8,5 @@ Installation:
 .. code-block:: bash
     pip install pystencils-autodiff
 """
-import os
 
-if 'CI' not in os.environ:
-    raise NotImplementedError('pystencils-autodiff is not installed. Run `pip install pystencils-autodiff`')
+raise NotImplementedError('pystencils-autodiff is not installed. Run `pip install pystencils-autodiff`')