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        "author": "Gregory Crosswhite",
        "author_email": "gcrosswhite@gmail.com",
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        "description": "Hey! PayCheck!\n--------------\n\nPayCheck is a half-baked implementation of\n`ScalaCheck <http://code.google.com/p/scalacheck/>`_, which itself is an\nimplementation of\n`QuickCheck <http://www.cs.chalmers.se/~rjmh/QuickCheck/>`_ for\nHaskell. PayCheck is useful for defining a specification of what a\nfunction\nshould do, rather than testing its results for a given input.\n\nThanks to gcross for some of the `more recent\nchanges <http://github.com/gcross/paycheck/tree/master>`_\n\nInstalling PayCheck\n~~~~~~~~~~~~~~~~~~~\n\n::\n\n    <code>\n    sudo easy_install paycheck\n    </code>\n\nThat\u2019s it. Get going.\n\nA Quick Example\n~~~~~~~~~~~~~~~\n\nLet\u2019s steal an example right from ScalaCheck. Here are the string\nfunctions\nported to PayCheck. See what\u2019s going on? We\u2019re defining the types of the\nparameters in with\\_checker, then values of that type are getting passed\nto the\nfunction.\n\n::\n\n    <code>\n    import unittest\n    from paycheck import with_checker\n\n    class TestStrings(unittest.TestCase):\n        \"\"\"\n        More-or-less a direct port of the string testing example from the ScalaCheck\n        doc at: http://code.google.com/p/scalacheck/\n        \"\"\"\n\n        @with_checker(str, str)\n        def test_starts_with(self, a, b):\n            self.assertTrue((a+b).startswith(a))\n\n        @with_checker(str, str)\n        def test_ends_with(self, a, b):\n            self.assertTrue((a+b).endswith(b))\n\n        # Is this really always true?\n        @with_checker(str, str)\n        def test_concat(self, a, b):\n            self.assertTrue(len(a+b) > len(a))\n            self.assertTrue(len(a+b) > len(b))\n\n        @with_checker(str, str)\n        def test_substring2(self, a, b):\n            self.assertEquals( (a+b)[len(a):], b )\n\n        @with_checker(str, str, str)\n        def test_substring3(self, a, b, c):\n            self.assertEquals((a+b+c)[len(a):len(a)+len(b)], b)\n\n    if __name__ == '__main__':\n        unittest.main()\n    </code>\n\nThen give the ol\u2019 test a run. You\u2019ll likely see a problem:\n\n::\n\n    <code>\n    $ python test_strings.py\n    F....\n    ======================================================================\n    FAIL: test_concat (__main__.TestStrings)\n    ----------------------------------------------------------------------\n    Traceback (most recent call last):\n      File \"paycheck/checker.py\", line 11, in wrapper\n        test_func(self, *v)\n      File \"test_strings.py\", line 20, in test_concat\n        self.assertTrue(len(a+b) > len(a))\n    AssertionError: Failed for input ('UGzo2LP<(9Gl_*o*GH$H<+{wPiNk?', '')\n\n    ----------------------------------------------------------------------\n    Ran 5 tests in 0.051s\n\n    FAILED (failures=1)\n    </code>\n\nAs predicted, test_concat has bombed; note that PayCheck is nice\nenough to tell you which inputs caused the problem. In this case, we\nsee that propety test_concat fails for the empty string, which is caused\nby the fact that we used \u201c>\u201d instead of \u201c>=\u201d.\n\nNested and More Complex Types\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\nContainer and nested types are specified to PayCheck \u201cby analogy\u201d.\nThat is, unlike scalar types, which are specified by giving the type\nthat you want, container types are specified by creating a non-empty\ncontainer of the type you want which contains a specification of the\ntype that you want generated containers to contain; note that the\ncontained element is itself allowed to be a container, allowing for\narbitrarily nested types. PayCheck will infer from your containers\nthe type of container and contained elements that you want to\ngenerate. This includes dictionaries: it will look at the first\nkey/value mapping that it sees and infer from it both the key type and\nthe value type. Containers will be generated with between 0 and\npaycheck.generator.LIST\\_LEN elements.\n\nThe following examples illustrate how this works:\n\n::\n\n    <code>\n    import unittest\n    from paycheck import with_checker\n\n    class TestTypes(unittest.TestCase):\n\n        @with_checker(int)\n        def test_int(self, i):\n            self.assertTrue(isinstance(i, int))\n\n        @with_checker([int])\n        def test_get_list(self, list_of_ints):\n            self.assertTrue(isinstance(list_of_ints, list))\n            for i in list_of_ints:\n                self.assertTrue(isinstance(i, int))\n\n        @with_checker([{str: int}])\n        def test_list_of_dict_of_int_string(self, list_of_dict_of_int_string):\n            self.assertTrue(isinstance(list_of_dict_of_int_string, list))\n\n            for dict_of_int_string in list_of_dict_of_int_string:\n                self.assertTrue(isinstance(dict_of_int_string, dict))\n\n                for key, value in dict_of_int_string.items():\n                    self.assertTrue(isinstance(key, str))\n                    self.assertTrue(isinstance(value, int))\n\n    if __name__ == '__main__':\n        unittest.main()\n    </code>",
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