code: def test_comparator(self):
      class Comparator(PropComparator):
          __hash__ = None
  
          attr = "bar"
  
          def method1(self):
              return "method1"
  
          def method2(self, other):
              return "method2"
  
          def __getitem__(self, key):
              return "value"
  
          def __eq__(self, other):
              return column("foo") == func.upper(other)
  
      Foo = self._fixture()
      d = MockDescriptor(Foo, "foo", comparator_factory=Comparator)
      d.instrument_class(Foo.__mapper__)
      eq_(Foo.foo.method1(), "method1")
      eq_(Foo.foo.method2("x"), "method2")
      assert Foo.foo.attr == "bar"
      assert Foo.foo["bar"] == "value"
      eq_((Foo.foo == "bar").__str__(), "foo = upper(:upper_1)")
  
imports: from sqlalchemy import Column
  from sqlalchemy import func
  from sqlalchemy import Integer
  from sqlalchemy import String
  from sqlalchemy.orm import aliased
  from sqlalchemy.orm import declarative_base
  from sqlalchemy.orm import descriptor_props
  from sqlalchemy.orm.interfaces import PropComparator
  from sqlalchemy.orm.properties import ColumnProperty
  from sqlalchemy.sql import column
  from sqlalchemy.testing import eq_
  from sqlalchemy.testing import fixtures
  from sqlalchemy.util import partial
label_desc: Use image node_id 5 for calling the DescriptorInstrumentationTest obj's underlying member method code with example usage: obj.test_comparator() and returns: str, str, str, unknown