Use TestCase.assertTrue() instead of TestCase.assert_()

[musicinmybrain]

The assert_() method is deprecated and will be removed in Python 3.12.

$ python3.11
Python 3.11.4 (main, Jun  7 2023, 00:00:00) [GCC 13.1.1 20230511 (Red Hat 13.1.1-2)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from unittest import TestCase
>>> TestCase.assert_
<function TestCase._deprecate.<locals>.deprecated_func at 0x7fc1cf20eac0>

$ python3.12
Python 3.12.0b3 (main, Jun 21 2023, 00:00:00) [GCC 13.1.1 20230614 (Red Hat 13.1.1-4)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from unittest import TestCase
>>> TestCase.assert_
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: type object 'TestCase' has no attribute 'assert_'. Did you mean: 'assertIn'?

[Natim]

Thanks 🙏