'Test multiline strings with leading commas'

def test_paste_leading_commas(self):

    tm = ip.magics_manager.registry['TerminalMagics']
    s = 'a    =    """\n,1,2,3\n"""'
    ip.user_ns.pop('foo', None)
    tm.store_or_execute(s, 'foo')
    nt.assert_in('foo', ip.user_ns)
