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 monkeyPatching

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about_exceptions.py

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#!/usr/bin/env python

# -*- coding: utf-8 -*-

from runner.koan import *

class AboutExceptions(Koan):

class MySpecialError(RuntimeError):

pass

def test_exceptions_inherit_from_exception(self):

mro = self.MySpecialError.mro()

self.assertEqual('RuntimeError', mro[1].__name__)

self.assertEqual('Exception', mro[2].__name__)

self.assertEqual('BaseException', mro[3].__name__)

self.assertEqual('object', mro[4].__name__)

def test_try_clause(self):

result = None

try:

self.fail("Oops")

except Exception as ex:

result = 'exception handled'

ex2 = ex

self.assertEqual('exception handled', result)

self.assertEqual(True, isinstance(ex2, Exception))

self.assertEqual(False, isinstance(ex2, RuntimeError))

self.assertTrue(issubclass(RuntimeError, Exception), \

"RuntimeError is a subclass of Exception")

self.assertEqual('Oops', ex2.args[0])

def test_raising_a_specific_error(self):

result = None

try:

raise self.MySpecialError("My Message")

except self.MySpecialError as ex:

result = 'exception handled'

msg = ex.args[0]

self.assertEqual('exception handled', result)

self.assertEqual('My Message', msg)

def test_else_clause(self):

result = None

try:

pass

except RuntimeError:

result = 'it broke'

pass

else:

result = 'no damage done'

self.assertEqual('no damage done', result)

def test_finally_clause(self):

result = None

try:

self.fail("Oops")

except:

# no code here

pass

finally:

result = 'always run'

self.assertEqual('always run', result)