CLN: DeprecationWarning in `_testing`
```
pandas/tests/indexes/test_index_new.py::TestIndexConstructorInference::test_constructor_infer_nat_dt_like[<NA>-DatetimeIndex-datetime64[ns]-ctor0-0]
pandas/tests/indexes/test_index_new.py::TestIndexConstructorInference::test_constructor_infer_nat_dt_like[<NA>-DatetimeIndex-datetime64[ns]-ctor0-0]
pandas/tests/indexes/test_index_new.py::TestIndexConstructorInference::test_constructor_infer_nat_dt_like[<NA>-DatetimeIndex-datetime64[ns]-ctor0-1]
pandas/tests/indexes/test_index_new.py::TestIndexConstructorInference::test_constructor_infer_nat_dt_like[<NA>-DatetimeIndex-datetime64[ns]-ctor0-1]
pandas/tests/indexes/test_index_new.py::TestIndexConstructorInference::test_constructor_infer_nat_dt_like[<NA>-TimedeltaIndex-timedelta64[ns]-ctor1-0]
pandas/tests/indexes/test_index_new.py::TestIndexConstructorInference::test_constructor_infer_nat_dt_like[<NA>-TimedeltaIndex-timedelta64[ns]-ctor1-0]
pandas/tests/indexes/test_index_new.py::TestIndexConstructorInference::test_constructor_infer_nat_dt_like[<NA>-TimedeltaIndex-timedelta64[ns]-ctor1-1]
pandas/tests/indexes/test_index_new.py::TestIndexConstructorInference::test_constructor_infer_nat_dt_like[<NA>-TimedeltaIndex-timedelta64[ns]-ctor1-1]
  /home/fangchenli/Workspace/pandas-VirosaLi/pandas/_testing.py:790: DeprecationWarning: elementwise comparison failed; this will raise an error in the future.
    diff = np.sum((left.values != right.values).astype(int)) * 100.0 / len(left)

```