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diff --git a/tests/extensions/test_overlapping_exceptions.py b/tests/extensions/test_overlapping_exceptions.py
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+++ b/tests/extensions/test_overlapping_exceptions.py
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+# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+# For details: https://github.com/PyCQA/pylint/blob/master/COPYING
+
+"""Tests for the pylint checker in :mod:`pylint.extensions.overlapping_exceptions
+"""
+
+from os.path import dirname, join
+from sys import version_info
+
+import pytest
+
+from pylint.extensions.overlapping_exceptions import OverlappingExceptionsChecker
+
+
+@pytest.fixture(scope='module')
+def checker(checker):
+    return OverlappingExceptionsChecker
+
+
+@pytest.fixture(scope='module')
+def disable(disable):
+    return ['I']
+
+
+def test_overlapping_exceptions(linter):
+    test = join(dirname(__file__), 'data', 'overlapping_exceptions.py')
+    linter.check([test])
+    msgs = linter.reporter.messages
+
+    expected = [
+        (13, 'Overlapping exceptions (SomeException and SomeException are the same)'),
+        (18, 'Overlapping exceptions (SomeException is an ancestor class of SubclassException)'),
+        (23, 'Overlapping exceptions (SomeException and AliasException are the same)'),
+        (28, 'Overlapping exceptions (AliasException is an ancestor class of SubclassException)'),
+        (34, 'Overlapping exceptions (SomeException and AliasException are the same)'),
+        (34, 'Overlapping exceptions (SomeException is an ancestor class of SubclassException)'),
+        (34, 'Overlapping exceptions (AliasException is an ancestor class of SubclassException)'),
+        (39, 'Overlapping exceptions (ArithmeticError is an ancestor class of FloatingPointError)'),
+        (44, 'Overlapping exceptions (ValueError is an ancestor class of UnicodeDecodeError)')
+    ]
+
+    assert len(msgs) == len(expected)
+    for msg, exp in zip(msgs, expected):
+        assert msg.msg_id == 'W0714'
+        assert msg.symbol == 'overlapping-except'
+        assert msg.category == 'warning'
+        assert (msg.line, msg.msg) == exp
+
+
+@pytest.mark.skipif(version_info < (3, 3),
+                    reason="not relevant to Python version")
+def test_overlapping_exceptions_py33(linter):
+    """From Python 3.3 both IOError and socket.error are aliases for OSError."""
+    test = join(dirname(__file__), 'data', 'overlapping_exceptions_py33.py')
+    linter.check([test])
+    msgs = linter.reporter.messages
+
+    expected = [
+        (7,  'Overlapping exceptions (IOError and OSError are the same)'),
+        (12, 'Overlapping exceptions (socket.error and OSError are the same)'),
+        (17, 'Overlapping exceptions (socket.error is an ancestor class of ConnectionError)'),
+    ]
+
+    assert len(msgs) == len(expected)
+    for msg, exp in zip(msgs, expected):
+        assert msg.msg_id == 'W0714'
+        assert msg.symbol == 'overlapping-except'
+        assert msg.category == 'warning'
+        assert (msg.line, msg.msg) == exp