Re: [Pyunit-interest] Recursive assert_equals.

[Desilets, A. <Ala...@nr...>]

Actually, I went ahead and implemented a recursive assert_equal() =
method. It works pretty well. It basically deals with all the primitive =
types (ints, floats, strings, etc), all collections (lists, tuples, =
dicts) and arbitrary objects.

When a difference is found, it provides helpful messages that help you =
drill down from the top to the bottom where the difference was found.

Alain


-----Original Message-----
From: Mark Geyzer [mailto:mar...@gm...]=20
Sent: Tuesday, December 05, 2006 1:54 AM
To: Desilets, Alain
Cc: pyu...@li...
Subject: Re: [Pyunit-interest] Recursive assert_equals.


You may try to convert your dictionaries to strings with "str" or "repr" =
function, and then call assert method on resulting strings. This will =
save you the hassle of implementing recursive assert, but then - in case =
of failure - you'll have top find the guilty field manually.=20

If you are not happy with that approach - you'll have to write a method =
that parses your dictionaries and checks each value with an assert - =
yucks!

BTW, if you are not aware - failed assert INTERRUPTS the test, so that =
if you have more than field with different values - it will throw =
exception on the first one checked.=20

PyUnit is about FrameWork for your tests, that's all; alas, it is not =
about checking complicated data structures.


Hope, it helps

On 11/29/06, Desilets, Alain <Ala...@nr...> wrote:
Is there a way to do a recursive assert_equals on a complex data =
structure?

For example, say I want to assert that two dictionary are "equal". The =
keys of the dictionary are strings, and the values are objects of type =
SomeClass, which, among other things, have an attrigute called =
some_attribute which is of type SomeOtherClass.=20

I want to write:

Self.assert_equal_recusrsive(expected_dict, got_dict)

And have the system do the following:

- Make sure that expected_dict and got_dict are both of the same type (a =
dictionary in this case)=20
- Make sure that they have the same string keys
- For each string key, make sure that the associated objects are of the =
same type (SomeClass), have the same attributes with same values.
- In particular for the some_attribute attribute, it would make sure =
that the values are also of the same type (SomeOtherClass), and that =
they have the same attribute values pairs.=20

Has this been written before? If not would it be doble (it seems to me =
it should be).

I know that in jUnit (Java version), this kind of recursive comparison =
is supported to at least some extend. For example, if I compare two =
dictionnary objects, the system will make sure that the keys are the =
same and the values too. But it doesn't go recursively into the =
attributes of objects AFAIK.=20


----
Alain D=E9silets, MASc
Agent de recherches/Research Officer
Institut de technologie de l'information du CNRC /
NRC Institute for Information Technology

ala...@nr...
T=E9l/Tel (613) 990-2813
Facsimile/t=E9l=E9copieur: (613) 952-7151

Conseil national de recherches Canada, M50, 1200 chemin Montr=E9al,
Ottawa (Ontario) K1A 0R6
National Research Council Canada, M50, 1200 Montreal Rd., Ottawa, ON=20
K1A 0R6

Gouvernement du Canada | Government of Canada



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Mark Geyzer
Software Engineer,
tel: 972-52-6782603=20