TST: clip inplace doesn't modify views with CoW (#51402)

Author: lithomas1

pandas/tests/copy_view/test_clip.py

@@ -0,0 +1,21 @@
+import numpy as np
+
+from pandas import DataFrame
+import pandas._testing as tm
+from pandas.tests.copy_view.util import get_array
+
+
+def test_clip_inplace_reference(using_copy_on_write):
+    df = DataFrame({"a": [1.5, 2, 3]})
+    df_copy = df.copy()
+    arr_a = get_array(df, "a")
+    view = df[:]
+    df.clip(lower=2, inplace=True)
+
+    # Clip not actually inplace right now but could be
+    assert not np.shares_memory(get_array(df, "a"), arr_a)
+
+    if using_copy_on_write:
+        assert df._mgr._has_no_reference(0)
+        assert view._mgr._has_no_reference(0)
+        tm.assert_frame_equal(df_copy, view)