diff --git a/tests/unit/core/operation/decomposition/test_column_sampling_decomposition.py b/tests/unit/core/operation/decomposition/test_column_sampling_decomposition.py
index 37191c81b..7c9c97236 100644
--- a/tests/unit/core/operation/decomposition/test_column_sampling_decomposition.py
+++ b/tests/unit/core/operation/decomposition/test_column_sampling_decomposition.py
@@ -34,4 +34,3 @@ def test_matrix_to_ts(sample_matrix):
     ts = cur.matrix_to_ts(sample_matrix)
     assert isinstance(ts, np.ndarray)
     assert len(ts.shape) == 1
-