2014-04-02 13:21 GMT+02:00 Roelof Wobben <r.wobben@home.nl>:

Hello,

On the first part I have to make a class named BlankCell which is a subclass of TestCase.
So far no problem.

No, firstly, all cells are just subclasses of Object (http://squeak.preeminent.org/tut2007/html/015.html).

And in step http://squeak.preeminent.org/tut2007/html/015A.html

class BlankCellTestCase is a subclass of TestCase

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But when you are on the MirrorCell part BlankCell must be a subclass of Cell.
But then the tests will fail because should: �cannot be found.

In step http://squeak.preeminent.org/tut2007/html/025.html, you create a new abstract class Cell
and moves the BlankCell under the new abstract class.
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The manual says nothing about that the new class Cell must be a part of TestCase.

No, the TestCases are just "using" your Cell classes.

In http://squeak.preeminent.org/tut2007/html/026.html you are moving the MirrorCell under Cell as well.

And only testcase BlankCellTestCase is a subclass of TestCase.
And then you are createinga new subclass of TestCase -> MirrorCellTestCase

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How to solve this ?

Roelof