Hi—I’m a beginner in Pharo and am working my way through Pharo by Example 5.0
(PbE) and Learning OOP and TDD with Pharo (LOTWP).
I’m currently going through 7.4 Designing a test, in LOTWP, which covers
testing whether a string has no repeated characters, adding the method String
>> isIsogramSet.
GramCheckerTest, a class for testing, has the following methods:
—
isograms
"list of isograms; used for testing"
^ #('pharo' 'pathfinder' 'xavier' 'lumberjacks’)
testAllIsogramSet
"using each word in list named 'isograms'"
self isograms do: [ :word | self assert: word isIsogramSet ]
—
Here are my questions:
1) These two methods are defined on the instance side (the Class button is
*not* selected). If so, what is the receiver when they are used?
2) In testAllIsogramSet, why do you need ‘self’? After all ‘isograms’ is a data
structure, and its message is ‘do:’
3) As an add-on to 2), what does ‘self’ refer to? The class GramCheckerTest? If
so, wouldn’t that make testAllIsogramSet a class method? But testAllIsogramSet
doesn’t appear in the class browser when I click the Class button when the
Class pane shows GramCheckerTest.
Thanks for any help you might give/point me to regarding this.
