Hola, me sale este error, no comprendo muy bien por què <code>Traceback (most recent call last): File "smoketest.py", line 6, in &lt;mo...

Hola, me sale este error, no comprendo muy bien por què

Traceback (most recent call last):
  File "smoketest.py", line 6, in <module>
    assertion_test = TestLoader.loadTestsFromTestCase(AssertionsTest)
TypeError: loadTestsFromTestCase() missing 1 required positional argument: 'testCaseClass'

from unittest import TestLoader, TestSuite
from pyunitreport import HTMLTestRunner
from assertions import AssertionsTest
from search_tests import SearchTest

assertion_test = TestLoader.loadTestsFromTestCase(AssertionsTest)
searched_test = TestLoader.loadTestsFromTestCase(SearchTest)

smoke_test = TestSuite([assertion_test, searched_test])

kwargs = {
    
        'output' : 'smoke-report'
}

runner = HTMLTestRunner(**kwargs)
runner.run(smoke_test)