Beefy Boxes and Bandwidth Generously Provided by pair Networks
Don't ask to ask, just ask

Re: (OT) Help with test design

by t'mo (Pilgrim)
on Sep 11, 2003 at 17:41 UTC ( #290765=note: print w/replies, xml ) Need Help??

in reply to (OT) Help with test design

Consider a design that has not only inheritance but composition, maybe like:

package A; ... package A::a; use base 'A'; ... package A::b; use base 'A'; ... package B; use A; # A is abstract and contains 'factory' methods, so we # will actually use instances of A::a or A::b ... package C; use B; ... package D; use C; use XYZ; # not our code...something we installed ...

Is part of your question how to write tests for D that will cover all the stuff in the included packages? That's a good question...I'm curious to find out The Answer™, but I think halley was on the right track.

From my own experience, this is simply one of those areas where you have to work from bottom to top: write the tests for A (including its subclasses), then those for B, and on up.

My insight, shallow as it might be, is based on a toy program (an "address book") I'm experimenting with. Substitute the following:

generic moduleaddress book module
A::c (yes, I know it's not in the example above)Email
DAddressBookApplication (the difference between this and AddressBook is that the former is mosly a data structure while this has the application and session logic: sign in, maintain session state, move from page to page, add/update/delete entries from the address book, etc.)
XYZDBI, CGI::Application, etc.

The tests require some thought and planning. I have separate test cases for the simplest cases (A::a), and slowly work up to the bigger ones (so far up to the C level).

To me it seems test design gets more complex if you want to "automate" testing. For example, lots of things in my toy app depend on the data available in backend database. I anticipate (unless The Answer™ proves otherwise) that I'll have to include in any automatic test scripts the creation and population of a test database.

So, I don't think I've really answered your question; it seems to be my question also (unless they're not really the same question and I'm projecting mine onto yours :-)).

Update: Another post has given me some more things to think about with respect to the question.

...every application I have ever worked on is a glorified munger...

Replies are listed 'Best First'.
Re: Re: (OT) Help with test design
by sandfly (Beadle) on Sep 11, 2003 at 21:53 UTC
    I agree with you t'mo - where your classes interact with data in some external resource, such as a file or database, you can't test without test data.

    The best solution I've found is to script as much of the database creation and population as possible ay you suggest.

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://290765]
and all is quiet...

How do I use this? | Other CB clients
Other Users?
Others chilling in the Monastery: (2)
As of 2017-08-20 13:32 GMT
Find Nodes?
    Voting Booth?
    Who is your favorite scientist and why?

    Results (316 votes). Check out past polls.