TestFailure: Assertion failed in first practice from Squeak by Example

[Newbies] TestFailure: Assertion failed in first
practice from Squeak by Example

Hi Eric,

You have and interesting one here. I tried your
example in both sq 7159 (3.10 basic) and in damiens sq
dev (sqdev7154-07.11.1) i.e the november version based
on sq 7154 basic. In both of those images the example
worked as the book said it would.

So either you have found an obscure bug in an obscure
version or have made a typing error in the one you
tried. (If it were me I would suspect a typo but then
I have always been a creative typer. ;-)

Of course the fun thing to do with an error is learn
how the debugger works.

Open the debugger (from the test runner click on the
failed method testShout that will get the
pre-debugger. click on debug. select the line with
StringTest>>#testShout in it and play with it trying
to find a way to pinpoint the exact error. If you are
open to what you see, you are bound to learn something
that will increase your squeaking skills. Now that's
really learning Squeak by Example!*

hth,

Yours in curiosity and service, --Jerome Peace

"There are no wrong answers only interesting results."
 -
Seymour Papert (somewhat folk processed). I learned it
while learning Logo.

Eric Eisaman eric.eisaman at gmail.com
Tue Dec 11 20:38:18 UTC 2007

Hello Jerome,

I checked the white space and it was the same. I went
and created numerous
other String methods basically invoking existing
methods and every test run
seems to yield a signal failure causing the assertion
to fail. I moved from
the Cassou Dev Image to the OLPC Etoys Dev Image and
made several of my own
String methods and respective tests which all ran
successfully. I don't know
why my coding didn't work in both cases. Thanks for
the time. Have a good
day.

Regards,

Eric Eisaman
"Scratch yourself into Squeaking."
http://scratch.mit.edu/users/eisaman



On Dec 12, 2007 4:46 AM, Jerome Peace
<peace_the_dreamer at yahoo.com> wrote:

> TestFailure: Assertion failed in first practice from
> Squeak by Example
>
> Hi Eric,
>
> Check your white space.
>
> There is a difference between 'oh no' and 'oh no '.
> While its hard for me to tell if this is your
problem
> it is a common difficulty. And it will be easy for
you

> to eliminate it as a possibility.
>
> Hth.
>
> Yours incuriosity and service, --Jeorme Peace
>
>
> Eric Eisaman eric.eisaman at gmail.com
> Mon Dec 10 21:28:41 UTC 2007
>
>
> Yes, the shout method is defined in the String

object.

>
> ***
> >Eric
> >
> >On Dec 11, 2007 7:09 AM, stephane ducasse
> <stephane.ducasse at free.fr> wrote:
> >
> >> Hi Eric
> >>
> >> On 10 déc. 07, at 21:48, Eric Eisaman wrote:
> >>
> >> > Hell Squeakers,
> >> >
> >> > At home I went through the first half of the
> Squeak by Example
> >> > book. The guided practice went without a hitch
> however, when I
> >> > worked through the first practice of writing a
> simple String method
> >> > at work, on a different image, I ran into this
> problem. Why am I

> >> > receiving an 'Assertion failed' message?

> >> >
> >> > testShout
> >> >  self assert: ('oh no' shout = 'OH NO!')
> >> >
> >>
> >> where the shout method is defined?
> >> In String?
> >>
> >> > shout
> >> >  ^ self asUppercase , '!'
> >> >

> >> > TestFailure: Assertion failed
> >> >
> >> > Regards,
> >> >
> >> > Eric Eisaman
> ***

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