Simplify FINAL_RESULTS and RERUN_RESULTS

Co-authored-by: Jan Wille <mail@janwille.de>

Author: EnricoMi

junitparser/junitparser.py

@@ -273,9 +273,6 @@ def __eq__(self, other):
         return super().__eq__(other)
 
 
-FINAL_RESULTS = {Failure, Error, Skipped}
-
-
 class System(Element):
     """Parent class for :class:`SystemOut` and :class:`SystemErr`.
 
@@ -322,7 +319,7 @@ class TestCase(Element):
     __test__ = False
 
     # JUnit TestCase children are final results, SystemOut and SystemErr
-    ITER_TYPES = {t._tag: t for t in set.union(FINAL_RESULTS, {SystemOut, SystemErr})}
+    ITER_TYPES = {t._tag: t for t in (Failure, Error, Skipped, SystemOut, SystemErr)}
 
     def __init__(self, name: str = None, classname: str = None, time: float = None):
         super().__init__(self._tag)

junitparser/xunit2.py

@@ -172,17 +172,20 @@ class FlakyError(InterimResult):
     _tag = "flakyError"
 
 
-RERUN_RESULTS = {RerunFailure, RerunError, FlakyFailure, FlakyError}
-
-
 R = TypeVar("R", bound=InterimResult)
 
 
 class TestCase(junitparser.TestCase):
     group = junitparser.Attr()
 
     # XUnit2 TestCase children are JUnit children and rerun results
-    ITER_TYPES = {t._tag: t for t in list(junitparser.TestCase.ITER_TYPES.values()) + list(RERUN_RESULTS)}
+    ITER_TYPES = {
+        t._tag: t
+        for t in itertools.chain(
+            junitparser.TestCase.ITER_TYPES.values(),
+            (RerunFailure, RerunError, FlakyFailure, FlakyError),
+        )
+    }
 
     def _interim_results(self, _type: Type[R]) -> List[R]:
         return [entry for entry in self if isinstance(entry, _type)]