added test for depr

Author: erfannariman

pandas/tests/generic/test_generic.py

@@ -561,3 +561,10 @@ def test_flags_identity(self, as_frame):
         assert s.flags is s.flags
         s2 = s.copy()
         assert s2.flags is not s.flags
+
+    def test_slice_shift_deprecated(self):
+        # GH 37601
+        df = pd.DataFrame({'A': [1, 2, 3, 4]})
+
+        with tm.assert_produces_warning(FutureWarning):
+            df['A'].slice_shift()