705a4d384f
* Add test case for file closure when an exception doesn't occur. * Add .meta/hints.md listing the methods for the `FileLike` class.
79 lines
2.7 KiB
Python
79 lines
2.7 KiB
Python
import unittest
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import error_handling as er
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class FileLike(object):
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def __init__(self, fail_something=True):
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self.is_open = False
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self.was_open = False
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self.did_something = False
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self.fail_something = fail_something
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def open(self):
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self.was_open = False
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self.is_open = True
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def close(self):
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self.is_open = False
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self.was_open = True
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def __enter__(self):
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self.open()
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return self
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def __exit__(self, *args):
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self.close()
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def do_something(self):
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self.did_something = True
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if self.fail_something:
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raise Exception()
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class ErrorHandlingTest(unittest.TestCase):
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def test_throw_exception(self):
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with self.assertRaises(Exception):
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er.handle_error_by_throwing_exception()
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def test_return_none(self):
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self.assertEqual(er.handle_error_by_returning_none('1'), 1,
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'Result of valid input should not be None')
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self.assertIsNone(er.handle_error_by_returning_none('a'),
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'Result of invalid input should be None')
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def test_return_tuple(self):
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successful_result, result = er.handle_error_by_returning_tuple('1')
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self.assertIs(successful_result, True,
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'Valid input should be successful')
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self.assertEqual(result, 1, 'Result of valid input should not be None')
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failure_result, result = er.handle_error_by_returning_tuple('a')
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self.assertIs(failure_result, False,
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'Invalid input should not be successful')
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def test_filelike_objects_are_closed_on_exception(self):
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filelike_object = FileLike(fail_something=True)
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with self.assertRaises(Exception):
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er.filelike_objects_are_closed_on_exception(filelike_object)
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self.assertIs(filelike_object.is_open, False,
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'filelike_object should be closed')
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self.assertIs(filelike_object.was_open, True,
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'filelike_object should have been opened')
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self.assertIs(filelike_object.did_something, True,
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'filelike_object should call do_something()')
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def test_filelike_objects_are_closed_without_exception(self):
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filelike_object = FileLike(fail_something=False)
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er.filelike_objects_are_closed_on_exception(filelike_object)
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self.assertIs(filelike_object.is_open, False,
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'filelike_object should be closed')
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self.assertIs(filelike_object.was_open, True,
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'filelike_object should have been opened')
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self.assertIs(filelike_object.did_something, True,
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'filelike_object should call do_something()')
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if __name__ == '__main__':
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unittest.main()
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