Function test_file_var_expand

IPython/core/tests/test_magic.py:892–905

%%writefile $filename

()

        nt.assert_in('line2', s)

def test_file_var_expand():
    """%%writefile $filename"""
    ip = get_ipython()
    with TemporaryDirectory() as td:
        fname = os.path.join(td, 'file1')
        ip.user_ns['filename'] = fname
        ip.run_cell_magic("writefile", '$filename', u'\n'.join([
            'line1',
            'line2',
        ]))
        with open(fname) as f:
            s = f.read()
        nt.assert_in('line1\n', s)
        nt.assert_in('line2', s)

def test_file_unicode():
    """%%writefile with unicode cell"""