Re: [osflash] Design By Contract on ActionScript 2

[Bernd Will]

Hello everybody,   don’t know if you know Python’s doctest feature. There you can embed tests right into the classes instead of coding xxxTest classes all the way. In Python you write down the header of the class, then start a comment tag and put numerous tests together with the expected results, then you close the comment. When done, you start writing the method. It is all in one place, no huddling no searching, just scroll up to the top of the method and you have the tests right before your nose.   Below is a short Python snippet demonstrating this nice feature. In Python comments are enclosed by  “”” […] “””” triple signs. Every test starts with the >>> sign, which is the call of the function. Every test is  written down as being called and after the call, you find the awaited result. This idea can’t be transferred to ActionScript, since Python is a Basic like interpreted language putting back results after every command. But the idea of putting tests and results in one place side by side with the code IMHO is worth thinking about as a nice feature.     def factorial(n):     """Return the factorial of n, an exact integer >= 0.       If the result is small enough to fit in an int, return an int.     Else return a long. Here are the tests:       >>> [factorial(n) for n in range(6)]     [1, 1, 2, 6, 24, 120]     >>> [factorial(long(n)) for n in range(6)]     [1, 1, 2, 6, 24, 120]     >>> factorial(30)     265252859812191058636308480000000L     >>> factorial(30L)     265252859812191058636308480000000L     >>> factorial(-1)     Traceback (most recent call last):         ...     ValueError: n must be >= 0       Factorials of floats are OK, but the float must be an exact integer:     >>> factorial(30.1)     Traceback (most recent call last):         ...     ValueError: n must be exact integer     >>> factorial(30.0)     265252859812191058636308480000000L       It must also not be ridiculously large:     >>> factorial(1e100)     Traceback (most recent call last):         ...     OverflowError: n too large     """     import math     if not n >= 0:         raise ValueError("n must be >= 0")     if math.floor(n) != n:         raise ValueError("n must be exact integer")     if n+1 == n:  # catch a value like 1e300         raise OverflowError("n too large")     result = 1     factor = 2     while factor <= n:         result *= factor         factor += 1     return result       def _test():     import doctest     doctest.testmod()       if __name__ == "__main__":     _test()     Regards Bernd   Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Im Auftrag von Michael Forrest Gesendet: Samstag, 7. Oktober 2006 11:27 An: Open Source Flash Mailing List Betreff: Re: [osflash] Design By Contract on ActionScript 2   Getting some unit testing working would be a start. AS2Lib has testing libraries and the AS2Ant tasks give a way of running them from ANT scripts as part of a build process. http://www.simonwacker.com On 10/5/06, Marcelo de Moraes Serpa <[EMAIL PROTECTED]> wrote: Is there any tool for AS2 that allows me to implement the DBC methodology? Cheers, Marceo. _______________________________________________ osflash mailing list osflash@osflash.org http://osflash.org/mailman/listinfo/osflash_osflash.org -- Michael Forrest MP3 feed: www.box.net/public/yk8y59h8da Myspace page: www.myspace.com/michaelforrest Official site: www.cinestatic.com/michaelforrest Last.fm artist page: www.last.fm/music/michael+forrest Jamendo (cc music download): www.jamendo.com/uk/artist/michael.forrest/ YouTube Videos: www.youtube.com/profile?user=michaelforrest

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