Like the title says, TestCase.assertSequenceEqual does not behave like TestCase.assertEqual where it uses TestCase._getAssertEqualityFunc. Instead, TestCase.assertSequenceEqual uses `item1 != item2`. That way I can do something like this:

```
def test_stuff(self):
   self.addTypeEqualityFunc(
      MyObject,
      comparison_method_which_compares_how_i_want,
   )
   self.assertListEqual(
      get_list_of_objects(),
      [MyObject(...), MyObject(...)],
   )
```

Brian, can you be more specific about what problem is caused by the fact that assertSequenceEqual does not use _getAssertEqualityFunc? Also, I'm not sure what your example is trying to demonstrate. Can you provide a minimal example that shows the problem, but also defines what ``MyObject``, etc. are?

Let me know if I'm missing something.

That's correct, and apparently not mentioned in the doc: https://docs.python.org/3/library/unittest.html#unittest.TestCase.assertSequenceEqual

I've attached an example of what I want. It contains a class, a function to be tested, and a test class which tests the function.

What TestCase.addTypeEqualityFunc feels like it offers is a chance to compare objects however I feel like is needed for each test. Sometimes all I want is to compare the properties of the objects, and maybe not even all of the properties! When I have a list of these objects and I've added an equality function for the object, I was expecting the test class to use my equality function when comparing objects in the list.

Closing as duplicate of issue22452.