gh-134565: Use ExceptionGroup to handle multiple errors in unittest.doModuleCleanups() (GH-134566)

Lib/unittest/case.py

@@ -149,9 +149,7 @@ def doModuleCleanups():
         except Exception as exc:
             exceptions.append(exc)
     if exceptions:
-        # Swallows all but first exception. If a multi-exception handler
-        # gets written we should use that here instead.
-        raise exceptions[0]
+        raise ExceptionGroup('module cleanup failed', exceptions)
 
 
 def skip(reason):

Lib/unittest/suite.py

@@ -223,6 +223,11 @@ class TestSuite(BaseTestSuite):
                 if result._moduleSetUpFailed:
                     try:
                         case.doModuleCleanups()
+                    except ExceptionGroup as eg:
+                        for e in eg.exceptions:
+                            self._createClassOrModuleLevelException(result, e,
+                                                                    'setUpModule',
+                                                                    currentModule)
                     except Exception as e:
                         self._createClassOrModuleLevelException(result, e,
                                                                 'setUpModule',
@@ -235,15 +240,15 @@ class TestSuite(BaseTestSuite):
         errorName = f'{method_name} ({parent})'
         self._addClassOrModuleLevelException(result, exc, errorName, info)
 
-    def _addClassOrModuleLevelException(self, result, exception, errorName,
+    def _addClassOrModuleLevelException(self, result, exc, errorName,
                                         info=None):
         error = _ErrorHolder(errorName)
         addSkip = getattr(result, 'addSkip', None)
-        if addSkip is not None and isinstance(exception, case.SkipTest):
-            addSkip(error, str(exception))
+        if addSkip is not None and isinstance(exc, case.SkipTest):
+            addSkip(error, str(exc))
         else:
             if not info:
-                result.addError(error, sys.exc_info())
+                result.addError(error, (type(exc), exc, exc.__traceback__))
             else:
                 result.addError(error, info)
 
@@ -273,6 +278,13 @@ class TestSuite(BaseTestSuite):
                                                             previousModule)
             try:
                 case.doModuleCleanups()
+            except ExceptionGroup as eg:
+                if isinstance(result, _DebugResult):
+                    raise
+                for e in eg.exceptions:
+                    self._createClassOrModuleLevelException(result, e,
+                                                            'tearDownModule',
+                                                            previousModule)
             except Exception as e:
                 if isinstance(result, _DebugResult):
                     raise