'Test the _write_sheet() method'

def test_write_sheet3(self):

    self.workbook._write_sheet('Bits    &    Bobs', 1, 0)
    exp = '<sheet    name="Bits    &amp;    Bobs"    sheetId="1"    r:id="rId1"/>'
    got = self.fh.getvalue()
    self.assertEqual(got, exp)
