1. Object model

1.1. An Object, simply

"EssentialsObjectTest, protocol tests"
testInspectObject

   ^ self exportSlotsGraphOf: Object new

1.2. nil, even more simpler

"EssentialsObjectTest, protocol tests"
testInspectNil

   ^ self exportSlotsGraphOf: nil

1.3. true and false

On one hand, truthness is encoded by,

"EssentialsObjectTest, protocol tests"
testInspectTrue

   ^ self exportSlotsGraphOf: true

On the other hand, falsehood is encoded by,

"EssentialsObjectTest, protocol tests"
testInspectFalse

   ^ self exportSlotsGraphOf: false

1.4. Object class and its superclasses

"EssentialsObjectTest, protocol tests"
testInspectObjectModel

   ^ self exportSlotsGraphOf: Object

1.4.1. Trait class

First introduced in [ScharliDNB03] then extended in [DNScharli+06], traits are another mechanism to define behavior. Some applications can be found in both [BScharliD03] and [CDW09], also a wiki page exists at [com].

As a real case, the class definition

ClassTestCase subclass: #CollectionRootTest
	uses: TIterateTest + TEmptyTest + TSizeTest
	instanceVariableNames: ''
	classVariableNames: ''
	package: 'Collections-Abstract-Tests-Base'

is an example of traits usage and its inspection produces