TST: Table doctest failures with pandas 1.1.0 #10608

============================= test session starts ==============================
platform linux -- Python 3.8.1, pytest-5.4.3, py-1.9.0, pluggy-0.13.1
cachedir: .tox/py38-test-alldeps/.pytest_cache
Running tests with Astropy version 4.2.dev455+g4d853f887.
Running tests in astropy docs.
Date: 2020-07-28T19:37:45
Platform: Linux-5.3.0-1029-gcp-x86_64-with-glibc2.2.5
Executable: /home/travis/build/astropy/astropy/.tox/py38-test-alldeps/bin/python
Full Python Version: 
3.8.1 (default, Dec 20 2019, 10:06:11) 
[GCC 7.4.0]
encodings: sys: utf-8, locale: UTF-8, filesystem: utf-8
byteorder: little
float info: dig: 15, mant_dig: 15
Package versions: 
Numpy: 1.19.1
Scipy: 1.5.2
Matplotlib: 3.3.0
h5py: 2.10.0
Pandas: 1.1.0
PyERFA: 1.7.0
Using Astropy options: remote_data: none.
rootdir: /home/travis/build/astropy/astropy, inifile: setup.cfg
plugins: filter-subpackage-0.1.1, hypothesis-5.23.3, xdist-1.34.0, openfiles-0.5.0, remotedata-0.3.2, forked-1.3.0, arraydiff-0.3, cov-2.10.0, asdf-2.7.0, doctestplus-0.7.0, astropy-header-0.1.2
collected 15405 items                                                

...

=================================== FAILURES ===================================
_______________ [doctest] astropy.table.table.Table.from_pandas ________________
3487           >>> import numpy as np
3488           >>> import pandas as pd
3489           >>> from astropy.table import QTable
3490 
3491           >>> time = pd.Series(['1998-01-01', '2002-01-01'], dtype='datetime64[ns]')
3492           >>> dt = pd.Series(np.array([1, 300], dtype='timedelta64[s]'))
3493           >>> df = pd.DataFrame({'time': time})
3494           >>> df['dt'] = dt
3495           >>> df['x'] = [3., 4.]
3496           >>> with pd.option_context('display.max_columns', 20):
Differences (unified diff with -expected +actual):
    @@ -1,3 +1,3 @@
    -        time       dt    x
    -0 1998-01-01 00:00:01  3.0
    -1 2002-01-01 00:05:00  4.0
    +        time              dt    x
    +0 1998-01-01 0 days 00:00:01  3.0
    +1 2002-01-01 0 days 00:05:00  4.0
/home/travis/build/astropy/astropy/.tox/py38-test-alldeps/lib/python3.8/site-packages/astropy/table/table.py:3496: DocTestFailure
________________ [doctest] astropy.table.table.Table.to_pandas _________________
3346 
3347           >>> q = [1, 2] * u.m
3348           >>> tm = Time([1998, 2002], format='jyear')
3349           >>> sc = SkyCoord([5, 6], [7, 8], unit='deg')
3350           >>> dt = TimeDelta([3, 200] * u.s)
3351 
3352           >>> t = QTable([q, tm, sc, dt], names=['q', 'tm', 'sc', 'dt'])
3353 
3354           >>> df = t.to_pandas(index='tm')
3355           >>> with pd.option_context('display.max_columns', 20):
Differences (unified diff with -expected +actual):
    @@ -1,4 +1,4 @@
    -              q  sc.ra  sc.dec       dt
    -tm
    -1998-01-01  1.0    5.0     7.0 00:00:03
    -2002-01-01  2.0    6.0     8.0 00:03:20
    +              q  sc.ra  sc.dec              dt
    +tm                                            
    +1998-01-01  1.0    5.0     7.0 0 days 00:00:03
    +2002-01-01  2.0    6.0     8.0 0 days 00:03:20
/home/travis/build/astropy/astropy/.tox/py38-test-alldeps/lib/python3.8/site-packages/astropy/table/table.py:3355: DocTestFailure