How to write results to only one file in test suite selenium

I have the following Test Suite code. This triggers the individual tests in the set. The problem is output to the html file. Suite creates a separate file for each test.

Would anyone know how to write results to only one file?

import unittest
import HtmlTestRunner
from check_password import PasswordTest
from check_username import test_Administration

class suite_test(unittest.TestSuite):
    suite1 = unittest.TestLoader().loadTestsFromTestCase(PasswordTest)
    suite2 = unittest.TestLoader().loadTestsFromTestCase(test_Administration)

    all_tests = unittest.TestSuite([suite1, suite2])

html_report_dir = './html_report'
#unittest.TextTestRunner().run(all_tests)
unittest.main(testRunner=HtmlTestRunner.HTMLTestRunner(output=html_report_dir))```