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- require File.expand_path(File.dirname(__FILE__) + '/neo')
- C = "top level"
- class AboutConstants < Neo::Koan
- C = "nested"
- def test_nested_constants_may_also_be_referenced_with_relative_paths
- assert_equal "nested", C
- end
- def test_top_level_constants_are_referenced_by_double_colons
- assert_equal "top level", ::C
- end
- def test_nested_constants_are_referenced_by_their_complete_path
- assert_equal "nested", AboutConstants::C
- assert_equal "nested", ::AboutConstants::C
- end
- # ------------------------------------------------------------------
- class Animal
- LEGS = 4
- def legs_in_animal
- LEGS
- end
- class NestedAnimal
- def legs_in_nested_animal
- LEGS
- end
- end
- end
- def test_nested_classes_inherit_constants_from_enclosing_classes
- assert_equal 4, Animal::NestedAnimal.new.legs_in_nested_animal
- end
- # ------------------------------------------------------------------
- class Reptile < Animal
- def legs_in_reptile
- LEGS
- end
- end
- def test_subclasses_inherit_constants_from_parent_classes
- assert_equal 4, Reptile.new.legs_in_reptile
- end
- # ------------------------------------------------------------------
- class MyAnimals
- LEGS = 2
- class Bird < Animal
- def legs_in_bird
- LEGS
- end
- end
- end
- def test_who_wins_with_both_nested_and_inherited_constants
- assert_equal 2, MyAnimals::Bird.new.legs_in_bird
- end
- # QUESTION: Which has precedence: The constant in the lexical scope,
- # or the constant from the inheritance hierarchy?
- # ------------------------------------------------------------------
- class MyAnimals::Oyster < Animal
- def legs_in_oyster
- LEGS
- end
- end
- def test_who_wins_with_explicit_scoping_on_class_definition
- assert_equal 4, MyAnimals::Oyster.new.legs_in_oyster
- end
- # QUESTION: Now which has precedence: The constant in the lexical
- # scope, or the constant from the inheritance hierarchy? Why is it
- # different than the previous answer?
- end
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