This file should never have been here; 0c18067b4b362a76ca57fece782ba86c3328c91b is to blame for restoring it.
Add these two tests to __doctest_skip__.  The write one is hypothetically useful, but unfortunately it's not set up to write to a temporary file, so when running astropy.test() it leaves this table.dat in your cwd.  As there are many unit tests that test this functionality I think this one should be skipped for now or rewritten to write to a temp file (it might be worth setting up the Doctest scaffolding to always write files to a temp location...)
Not sure why this is still hanging around here--I believe this was meant to be deleted.
Merge pull request #1715 from mdboom/unit/low-hanging-fruit

Low hanging optimizations in units and coordinates
Merge pull request #1771 from mdboom/docs/doctest-pytest

Run doctests in .rst files
Added credit to kyle barbary for logos

[ci skip]
Merge pull request #1814 from embray/astropy.test-issues

Fix some minor issues with astropy.test()
Documentation test corrections to remove python2 rounding errors
Typo correction ("1D" instead of "2D")
Merge pull request #1823 from mhvk/documentation-test-rounding-problems

Documentation test corrections to remove python2 rounding errors
Merge pull request #1825 from mboquien/typo_correction

Typo correction ("1D" instead of "2D")
Perform our own more specific version check for Sphinx