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"""Implementation of the parametric test support for Python 2.x
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2009-2011 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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import sys
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import unittest
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from compiler.consts import CO_GENERATOR
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#-----------------------------------------------------------------------------
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# Classes and functions
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#-----------------------------------------------------------------------------
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def isgenerator(func):
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try:
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return func.func_code.co_flags & CO_GENERATOR != 0
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except AttributeError:
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return False
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class ParametricTestCase(unittest.TestCase):
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"""Write parametric tests in normal unittest testcase form.
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Limitations: the last iteration misses printing out a newline when running
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in verbose mode.
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"""
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def run_parametric(self, result, testMethod):
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# But if we have a test generator, we iterate it ourselves
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testgen = testMethod()
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while True:
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try:
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# Initialize test
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result.startTest(self)
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# SetUp
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try:
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self.setUp()
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except KeyboardInterrupt:
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raise
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except:
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result.addError(self, sys.exc_info())
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return
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# Test execution
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ok = False
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try:
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next(testgen)
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ok = True
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except StopIteration:
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# We stop the loop
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break
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except self.failureException:
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result.addFailure(self, sys.exc_info())
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except KeyboardInterrupt:
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raise
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except:
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result.addError(self, sys.exc_info())
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# TearDown
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try:
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self.tearDown()
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except KeyboardInterrupt:
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raise
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except:
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result.addError(self, sys.exc_info())
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ok = False
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if ok: result.addSuccess(self)
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finally:
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result.stopTest(self)
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def run(self, result=None):
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if result is None:
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result = self.defaultTestResult()
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testMethod = getattr(self, self._testMethodName)
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# For normal tests, we just call the base class and return that
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if isgenerator(testMethod):
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return self.run_parametric(result, testMethod)
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else:
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return super(ParametricTestCase, self).run(result)
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def parametric(func):
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"""Decorator to make a simple function into a normal test via unittest."""
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class Tester(ParametricTestCase):
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test = staticmethod(func)
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Tester.__name__ = func.__name__
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return Tester
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