__________________________ test_serialize_ecsv_masked __________________________

tmpdir = local('/tmp/pytest-of-buildd/pytest-0/test_serialize_ecsv_masked0')

    @pytest.mark.skipif('not HAS_YAML')
    def test_serialize_ecsv_masked(tmpdir):
        tm = Time([1, 2, 3], format='cxcsec')
        tm[1] = np.ma.masked
    
        # Serializing in the default way for ECSV fails to round-trip
        # because it writes out a "nan" instead of "".  But for jd1/jd2
        # this works OK.
        tm.info.serialize_method['ecsv'] = 'jd1_jd2'
    
        fn = str(tmpdir.join('tempfile.ecsv'))
        t = Table([tm])
        t.write(fn)
>       t2 = Table.read(fn)

astropy/time/tests/test_mask.py:208: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
astropy/table/connect.py:52: in __call__
    out = registry.read(cls, *args, **kwargs)
astropy/io/registry.py:523: in read
    data = reader(*args, **kwargs)
astropy/io/ascii/connect.py:19: in io_read
    return read(filename, **kwargs)
astropy/io/ascii/ui.py:323: in read
    dat = reader.read(table)
astropy/io/ascii/core.py:1204: in read
    table = self.outputter(cols, self.meta)
astropy/io/ascii/ecsv.py:202: in __call__
    out = serialize._construct_mixins_from_columns(out)
astropy/table/serialize.py:302: in _construct_mixins_from_columns
    _construct_mixin_from_columns(new_name, obj_attrs, out)
astropy/table/serialize.py:288: in _construct_mixin_from_columns
    col = _construct_mixin_from_obj_attrs_and_info(obj_attrs, info)
astropy/table/serialize.py:217: in _construct_mixin_from_obj_attrs_and_info
    mixin = cls.info._construct_from_dict(obj_attrs)
astropy/time/core.py:190: in _construct_from_dict
    out = self._construct_from_dict_base(map)
astropy/time/core.py:182: in _construct_from_dict_base
    out = self._parent_cls(**map)
astropy/time/core.py:428: in __init__
    self._init_from_vals(val, val2, format, scale, copy,
astropy/time/core.py:483: in _init_from_vals
    self._time = self._get_time_fmt(val, val2, format, scale,
astropy/time/core.py:534: in _get_time_fmt
    return cls(val, val2, scale, precision, in_subfmt, out_subfmt)
astropy/time/formats.py:147: in __init__
    self.set_jds(val1, val2)
astropy/time/formats.py:404: in set_jds
    self.jd1, self.jd2 = day_frac(val1, val2)
astropy/time/utils.py:46: in day_frac
    sum12, err12 = two_sum(val1, val2)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

a = array([2450815., 2450815., 2450815.])
b = array([-0.49998843,         nan, -0.49996528])

    def two_sum(a, b):
        """[…]"""
>       x = a + b
E       RuntimeWarning: invalid value encountered in add

astropy/time/utils.py:133: RuntimeWarning