[python-nl] testing

[Zaheer Soebhan]

Maybe you should raise an exception when x or y have the wrong value,
because you don't want the wrong local variables in your function anyway, I
assume.
Then (unit)test if this actually happens with the "wrong" parameters in your
function.

Gr,
Zaheer

2010/4/23 Konrad Delong <konryd at gmail.com>

> On 23 April 2010 11:56, C.T. Matsumoto <c.t.matsumoto at gmail.com> wrote:
> > Hello all,
> >
> > Does anyone know a good way to test function objects? It's easy enough to
> > test class attributes, but for some reason I'm finding it difficult to
> test
> > if a function has the right 'attributes'.
> >
> > I'm using unittest and nosetests.
> >
> > Sample function:
> >
> > def foo():
> >    x = 3
> >    y = 4
> >
> > This example is super simple but lets pretend that x and y were derived
> from
> > some more complicated code that was done inside the function. The best
> way I
> > can come up with is moving the complicated code into another function
> that
> > returns the derived value and then test the return value, but if i want
> to
> > keep the code in the function how can I get to those 'attribute' values
> to
> > test?
> >
>
> x and y in your example are not attributes, but variables. They
> disappear right after the function returns. There is no way to access
> their values from outside. The only thing you can test for functions
> is its return value (for a given set of arguments). If x and y are in
> fact generated by a complicated expression you should extract those
> expressions into external function.
>
> BEFORE
> def foo(arg1, arg2):
>  x = <huge complicated expression that depends on values of arg1 and arg2>
>  return x + 7
>
> AFTER
> def huge_complicated_expression(arg1, arg2):
>  return <huge complicated expression that depends on values of arg1 and
> arg2>
>
> def foo(arg1, arg2):
>  x = huge_complicated_expression(arg1, arg2)
>  return x + 7
>
>
> cheers,
> Konrad
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