Issue #25761: Added more test cases for testing unpickling broken data.

Output raised exception at verbose level 2 (-vv).

Lib/test/test_pickle.py

@@ -33,6 +33,11 @@ class PyUnpicklerTests(AbstractUnpickleTests):
 
     unpickler = pickle._Unpickler
     bad_stack_errors = (IndexError,)
+    bad_mark_errors = (IndexError, pickle.UnpicklingError,
+                       TypeError, AttributeError, EOFError)
+    truncated_errors = (pickle.UnpicklingError, EOFError,
+                        AttributeError, ValueError,
+                        struct.error, IndexError, ImportError)
 
     def loads(self, buf, **kwds):
         f = io.BytesIO(buf)
@@ -64,6 +69,11 @@ class InMemoryPickleTests(AbstractPickleTests, AbstractUnpickleTests,
     pickler = pickle._Pickler
     unpickler = pickle._Unpickler
     bad_stack_errors = (pickle.UnpicklingError, IndexError)
+    bad_mark_errors = (pickle.UnpicklingError, IndexError,
+                       TypeError, AttributeError, EOFError)
+    truncated_errors = (pickle.UnpicklingError, EOFError,
+                        AttributeError, ValueError,
+                        struct.error, IndexError, ImportError)
 
     def dumps(self, arg, protocol=None):
         return pickle.dumps(arg, protocol)
@@ -122,6 +132,9 @@ if has_c_implementation:
     class CUnpicklerTests(PyUnpicklerTests):
         unpickler = _pickle.Unpickler
         bad_stack_errors = (pickle.UnpicklingError,)
+        bad_mark_errors = (EOFError,)
+        truncated_errors = (pickle.UnpicklingError, EOFError,
+                            AttributeError, ValueError)
 
     class CPicklerTests(PyPicklerTests):
         pickler = _pickle.Pickler