rename test + move check

pandas/core/construction.py

@@ -498,8 +498,6 @@ def sanitize_array(
  """
  if isinstance(data, ma.MaskedArray):
  data = sanitize_masked_array(data)
- elif isinstance(data, np.matrix):
- data = data.A
 
  if isinstance(dtype, PandasDtype):
  # Avoid ending up with a PandasArray
@@ -525,6 +523,8 @@ def sanitize_array(
 
  # GH#846
  if isinstance(data, np.ndarray):
+ if isinstance(data, np.matrix):
+ data = data.A
 
  if dtype is not None and is_float_dtype(data.dtype) and is_integer_dtype(dtype):
  # possibility of nan -> garbage

pandas/tests/frame/indexing/test_setitem.py

@@ -680,7 +680,7 @@ def test_boolean_mask_nullable_int64(self):
  )
  tm.assert_frame_equal(result, expected)
 
- def test_2d_array(self):
+ def test_setitem_npmatrix_2d(self):
  # for use-case df["x"] = sparse.random(10, 10).mean(axis=1)
  expected = DataFrame(
  {"np-array": np.ones(10), "np-matrix": np.ones(10)}, index=np.arange(10)