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from __future__ import annotations
import os
import sys
developer_note = """
vtk has been directly imported in vtk>=9
Please see:
https://github.com/pyvista/pyvista/pull/1163
"""
def test_vtk_not_loaded():
"""This test verifies that the vtk module isn't loaded when using vtk>=9
We use ``os.system`` because we need to test the import of pyvista
outside of the pytest unit test framework as pytest loads vtk.
"""
exe_str = "import pyvista; import sys; assert 'vtk' not in sys.modules"
# anything other than 0 indicates an error
assert not os.system(f'{sys.executable} -c "{exe_str}"'), developer_note
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