Ignore ephemeral classes in test_all_present()

Fixed a regression in the test suite where the test called
``CompareAndCopyTest::test_all_present`` would fail on some platforms due
to additional testing artifacts being detected. Pull request courtesy Nils
Philippsen.

In some circumstances, ephemeral class objects that are created within
the scope of a test method don't seem to be garbage collected directly
on exit. Filter out classes created in test modules.

Fixes: #7450
Closes: #7451
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/7451
Pull-request-sha: 135a8aaba2

Change-Id: I621967bd916089dc1e3f98625fd2a852cd9fd712
(cherry picked from commit 4291e3c235569031948ebaacec4dde8776255e0e)

doc/build/changelog/unreleased_14/7450.rst

@@ -0,0 +1,9 @@
+.. change::
+    :tags: bug, tests, regression
+    :tickets: 7450
+
+    Fixed a regression in the test suite where the test called
+    ``CompareAndCopyTest::test_all_present`` would fail on some platforms due
+    to additional testing artifacts being detected. Pull request courtesy Nils
+    Philippsen.
+

test/sql/test_compare.py

@@ -1357,6 +1357,10 @@ class CompareAndCopyTest(CoreFixtures, fixtures.TestBase):
         ]
 
     def test_all_present(self):
+        """test for elements that are in SQLAlchemy Core, that they are
+        also included in the fixtures above.
+
+        """
         need = set(
             cls
             for cls in class_hierarchy(ClauseElement)
@@ -1364,9 +1368,9 @@ class CompareAndCopyTest(CoreFixtures, fixtures.TestBase):
             and (
                 "__init__" in cls.__dict__
                 or issubclass(cls, AliasedReturnsRows)
-                or "inherit_cache" not in cls.__dict__
             )
             and not issubclass(cls, (Annotated))
+            and cls.__module__.startswith("sqlalchemy.")
             and "orm" not in cls.__module__
             and "compiler" not in cls.__module__
             and "crud" not in cls.__module__