adapt import for importlib mode

Author: fsoubelet

tests/unit/test_coupling.py

@@ -5,7 +5,6 @@
 import pytest
 import tfs
 from pandas.testing import assert_frame_equal
-from test_rdt import arrays_are_close_almost_everywhere
 
 from optics_functions.constants import (
     ALPHA,
@@ -32,6 +31,8 @@
 )
 from optics_functions.utils import prepare_twiss_dataframe
 
+from .test_rdt import arrays_are_close_almost_everywhere
+
 INPUT = Path(__file__).parent.parent / "inputs"
 COUPLING_BUMP_INPUTS = INPUT / "coupling_bump"
 COUPLING_BUMP_TWISS_BEAM_1 = COUPLING_BUMP_INPUTS / "twiss.lhc.b1.coupling_bump.tfs"