Use pytest/bare asserts in tests

[s-t-e-v-e-n-k]

nose has been unmaintained upstream for years now, and so this project
should move with the times. To that end, switch to either using bare
assert statements, or where that isn't suitable, using pytest's raises
context manager.

[dotlambda]

Suggested change

	with raises(NotImplementedError):
	d.fromkeys()
	d.viewitems()
	d.viewkeys()
	d.viewvalues()
	with raises(NotImplementedError):
	d.fromkeys()
	with raises(NotImplementedError):
	d.viewitems()
	with raises(NotImplementedError):
	d.viewkeys()
	with raises(NotImplementedError):
	d.viewvalues()

[dotlambda]

Even with this change the test fails for me with

============================= test session starts ==============================
platform linux -- Python 3.12.4, pytest-8.2.2, pluggy-1.5.0
rootdir: /build/source
collected 14 items                                                             

tests/expiringdict_extended_test.py ....                                 [ 28%]
tests/expiringdict_test.py ...F......                                    [100%]

=================================== FAILURES ===================================
__________________________________ test_repr ___________________________________

    def test_repr():
        d = ExpiringDict(max_len=2, max_age_seconds=0.01)
        d['a'] = 'x'
        assert str(d) == "ExpiringDict({'a': 'x'})"
        sleep(0.01)
>       assert str(d) == "ExpiringDict([])"

tests/expiringdict_test.py:70: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = ExpiringDict(), key = 'a', with_age = False

    def __getitem__(self, key, with_age=False):
        """ Return the item of the dict.
    
        Raises a KeyError if key is not in the map.
        """
        with self.lock:
            item = OrderedDict.__getitem__(self, key)
            item_age = time.time() - item[1]
            if item_age < self.max_age:
                if with_age:
                    return item[0], item_age
                else:
                    return item[0]
            else:
                del self[key]
>               raise KeyError(key)
E               KeyError: 'a'

expiringdict/__init__.py:86: KeyError
=========================== short test summary info ============================
FAILED tests/expiringdict_test.py::test_repr - KeyError: 'a'
========================= 1 failed, 13 passed in 0.22s =========================

[dotlambda]

The format changes starting with Python 3.12:

Suggested change

	assert str(d) == "ExpiringDict([('a', 'x')])"
	assert str(d) == "ExpiringDict({'a': 'x')}"

[AndrewKvalheim]

The empty representation has changed too:

-    assert str(d) == "ExpiringDict([])"
+    assert str(d) == "ExpiringDict()"

But stepping back, the module itself isn’t compatible with Python 3.12 so I don’t think it’s appropriate to update the tests for that yet.

[McSinyx]

Let's switch to unittest.mock too!