def test_len(self):
    ' test for boostrap helper'
    for i in range(len(test_cases)):
        self.assertEqual(len(results[i]), test_cases[i]['len'])
        self.assertEqual(len(resultsInt64[i]), test_cases[i]['len'])
test for boostrap helper
def test_len(self):
    ' '
    for i in range(len(test_cases)):
        self.assertEqual(len(results[i]), test_cases[i]['len'])
        self.assertEqual(len(resultsInt64[i]), test_cases[i]['len'])