'Test the _write_col_breaks() method'

def test_write_col_breaks_2(self):

    self.worksheet.vbreaks = [8, 3, 1, 0]
    self.worksheet._write_col_breaks()
    exp = '<colBreaks    count="3"    manualBreakCount="3"><brk    id="1"    max="1048575"    man="1"/><brk    id="3"    max="1048575"    man="1"/><brk    id="8"    max="1048575"    man="1"/></colBreaks>'
    got = self.fh.getvalue()
    self.assertEqual(got, exp)
