Add test for np.nan

Author: yuanx749

pandas/core/dtypes/cast.py

@@ -1931,6 +1931,7 @@ def np_can_hold_element(dtype: np.dtype, element: Any) -> Any:
                 if lib.is_bool_array(element):
                     return element.astype("bool")
             raise LossySetitemError
+
         if lib.is_bool(element):
             return element
         raise LossySetitemError

pandas/tests/dtypes/cast/test_can_hold_element.py

@@ -91,3 +91,8 @@ def test_can_hold_element_bool():
     assert not can_hold_element(arr, element)
     assert not can_hold_element(arr, np.array([element]))
     assert not can_hold_element(arr, np.array([element], dtype=object))
+
+    element = np.nan
+    assert not can_hold_element(arr, element)
+    assert not can_hold_element(arr, np.array([element]))
+    assert not can_hold_element(arr, np.array([element], dtype=object))